* Re: INFO: task hung in cleanup_net [not found] <001a113eca40eaee1c0560b0aad0@google.com> @ 2017-12-19 12:47 ` Dmitry Vyukov 2017-12-19 18:17 ` David Ahern 0 siblings, 1 reply; 3+ messages in thread From: Dmitry Vyukov @ 2017-12-19 12:47 UTC (permalink / raw) To: syzbot Cc: LKML, Ingo Molnar, Peter Zijlstra, syzkaller-bugs, David Miller, dsahern, Florian Westphal, Daniel Borkmann, Xin Long, jakub.kicinski, mschiffer, Vladislav Yasevich, Jiri Benc, netdev On Tue, Dec 19, 2017 at 1:33 PM, syzbot <bot+b17f10c8a8c693b40723d40d6553fbc54d197679@syzkaller.appspotmail.com> wrote: > Hello, > > syzkaller hit the following crash on > e40fd8d6b4d9f59b160faa1736f78fc07533ff37 > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > > Unfortunately, I don't have any reproducer for this bug yet. > > > sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default > minimum of 512 > sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default > minimum of 512 > sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default > minimum of 512 > INFO: task kworker/u4:11:3785 blocked for more than 120 seconds. > Not tainted 4.15.0-rc2-next-20171207+ #61 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/u4:11 D16448 3785 2 0x80000000 > Workqueue: netns cleanup_net > Call Trace: > context_switch kernel/sched/core.c:2800 [inline] > __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 > schedule+0xf5/0x430 kernel/sched/core.c:3435 > schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3493 > __mutex_lock_common kernel/locking/mutex.c:833 [inline] > __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 > mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 > rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 > cleanup_net+0x24c/0xb60 net/core/net_namespace.c:453 > process_one_work+0xbfd/0x1bc0 kernel/workqueue.c:2113 > worker_thread+0x223/0x1990 kernel/workqueue.c:2247 > kthread+0x37a/0x440 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 > > Showing all locks held in the system: > 2 locks held by khungtaskd/672: > #0: (rcu_read_lock){....}, at: [<00000000b9bef8ab>] > check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] > #0: (rcu_read_lock){....}, at: [<00000000b9bef8ab>] watchdog+0x1c5/0xd60 > kernel/hung_task.c:249 > #1: (tasklist_lock){.+.+}, at: [<000000006d6acf8b>] > debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 > 1 lock held by rsyslogd/2970: > #0: (&f->f_pos_lock){+.+.}, at: [<000000001cede688>] > __fdget_pos+0x131/0x1a0 fs/file.c:765 > 2 locks held by getty/3052: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3053: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3054: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3055: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3056: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3057: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3058: > #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 1 lock held by syz-executor2/3320: > #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 > net/core/rtnetlink.c:74 > 4 locks held by kworker/u4:11/3785: > #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] > __write_once_size include/linux/compiler.h:212 [inline] > #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] > atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] > atomic_long_set include/asm-generic/atomic-long.h:57 [inline] > #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] > set_work_data kernel/workqueue.c:619 [inline] > #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] > set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] > #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] > process_one_work+0xad4/0x1bc0 kernel/workqueue.c:2084 > #1: (net_cleanup_work){+.+.}, at: [<000000008a817b5c>] > process_one_work+0xb2f/0x1bc0 kernel/workqueue.c:2088 > #2: (net_mutex){+.+.}, at: [<0000000079150fd8>] cleanup_net+0x247/0xb60 > net/core/net_namespace.c:450 > #3: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 > net/core/rtnetlink.c:74 > 3 locks held by kworker/0:6/14978: > #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] > __write_once_size include/linux/compiler.h:212 [inline] > #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] > atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] > atomic_long_set include/asm-generic/atomic-long.h:57 [inline] > #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] > set_work_data kernel/workqueue.c:619 [inline] > #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] > set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] > #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] > process_one_work+0xad4/0x1bc0 kernel/workqueue.c:2084 > #1: ((addr_chk_work).work){+.+.}, at: [<000000008a817b5c>] > process_one_work+0xb2f/0x1bc0 kernel/workqueue.c:2088 > #2: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 > net/core/rtnetlink.c:74 > 1 lock held by syz-executor2/15852: > #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 > net/core/rtnetlink.c:74 > 1 lock held by syz-executor7/15958: > #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 > net/core/rtnetlink.c:74 > 1 lock held by syz-executor7/15961: > #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 > net/core/rtnetlink.c:74 > > ============================================= > > NMI backtrace for cpu 1 > CPU: 1 PID: 672 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171207+ #61 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:53 > nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 > nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62 > arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 > trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] > check_hung_task kernel/hung_task.c:132 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] > watchdog+0x90c/0xd60 kernel/hung_task.c:249 > kthread+0x37a/0x440 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 PID: 15938 Comm: syz-executor7 Not tainted 4.15.0-rc2-next-20171207+ > #61 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:inb arch/x86/include/asm/io.h:348 [inline] > RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:434 > RSP: 0018:ffff8801c1c173e8 EFLAGS: 00000002 > RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 > RDX: 00000000000003fd RSI: ffffc90001c88000 RDI: ffffffff880fa9c0 > RBP: ffff8801c1c173f8 R08: 0000000000000002 R09: 000000000000000c > R10: 0000000000000000 R11: ffffffff87896d20 R12: ffffffff880fa980 > R13: 0000000000000020 R14: fffffbfff101f577 R15: fffffbfff101f53a > FS: 00007f1ef8fad700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fbea91b6000 CR3: 00000001d0aaa000 CR4: 00000000001406f0 > DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000020001020 > DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 > Call Trace: > serial_in drivers/tty/serial/8250/8250.h:111 [inline] > wait_for_xmitr+0x93/0x1e0 drivers/tty/serial/8250/8250_port.c:2033 > serial8250_console_putchar+0x1f/0x60 > drivers/tty/serial/8250/8250_port.c:3170 > uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858 > serial8250_console_write+0x647/0xa20 > drivers/tty/serial/8250/8250_port.c:3236 > univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 > call_console_drivers kernel/printk/printk.c:1574 [inline] > console_unlock+0x788/0xd70 kernel/printk/printk.c:2233 > vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757 > vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 > vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 > printk+0xaa/0xca kernel/printk/printk.c:1829 > __dev_set_promiscuity+0x2a4/0x630 net/core/dev.c:6609 > __dev_change_flags+0x559/0x990 net/core/dev.c:6826 > dev_change_flags+0x88/0x140 net/core/dev.c:6886 > dev_ifsioc+0x60d/0x9b0 net/core/dev_ioctl.c:257 > dev_ioctl+0x2c2/0xf90 net/core/dev_ioctl.c:566 > sock_do_ioctl+0x94/0xb0 net/socket.c:971 > sock_ioctl+0x2c2/0x440 net/socket.c:1061 > vfs_ioctl fs/ioctl.c:46 [inline] > do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 > SYSC_ioctl fs/ioctl.c:701 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 > entry_SYSCALL_64_fastpath+0x1f/0x96 > RIP: 0033:0x452a39 > RSP: 002b:00007f1ef8facc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f1ef8fad700 RCX: 0000000000452a39 > RDX: 00000000208a3fe0 RSI: 0000000000008914 RDI: 0000000000000019 > RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 > R13: 0000000000a6f7ff R14: 00007f1ef8fad9c0 R15: 0000000000000002 > Code: 24 d9 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa > 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 40 89 da ec <5b> 0f b6 c0 41 > 5c 5d c3 e8 88 ad 18 ff eb c2 e8 e1 ad 18 ff eb This looks like +rtnetlink issue. > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@googlegroups.com. > Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com> > > syzbot will keep track of this bug report. > Once a fix for this bug is merged into any tree, reply to this email with: > #syz fix: exact-commit-title > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/001a113eca40eaee1c0560b0aad0%40google.com. > For more options, visit https://groups.google.com/d/optout. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: INFO: task hung in cleanup_net 2017-12-19 12:47 ` INFO: task hung in cleanup_net Dmitry Vyukov @ 2017-12-19 18:17 ` David Ahern 2017-12-28 13:56 ` Dmitry Vyukov 0 siblings, 1 reply; 3+ messages in thread From: David Ahern @ 2017-12-19 18:17 UTC (permalink / raw) To: Dmitry Vyukov, syzbot Cc: LKML, Ingo Molnar, Peter Zijlstra, syzkaller-bugs, David Miller, dsahern, Florian Westphal, Daniel Borkmann, Xin Long, jakub.kicinski, mschiffer, Vladislav Yasevich, Jiri Benc, netdev On 12/19/17 5:47 AM, Dmitry Vyukov wrote: > On Tue, Dec 19, 2017 at 1:33 PM, syzbot > <bot+b17f10c8a8c693b40723d40d6553fbc54d197679@syzkaller.appspotmail.com> > wrote: >> Hello, >> >> syzkaller hit the following crash on >> e40fd8d6b4d9f59b160faa1736f78fc07533ff37 >> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master >> compiler: gcc (GCC) 7.1.1 20170620 >> .config is attached >> Raw console output is attached. >> >> Unfortunately, I don't have any reproducer for this bug yet. >> >> >> sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default >> minimum of 512 >> sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default >> minimum of 512 >> sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default >> minimum of 512 >> INFO: task kworker/u4:11:3785 blocked for more than 120 seconds. >> Not tainted 4.15.0-rc2-next-20171207+ #61 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> kworker/u4:11 D16448 3785 2 0x80000000 >> Workqueue: netns cleanup_net >> Call Trace: >> context_switch kernel/sched/core.c:2800 [inline] >> __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 >> schedule+0xf5/0x430 kernel/sched/core.c:3435 >> schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3493 >> __mutex_lock_common kernel/locking/mutex.c:833 [inline] >> __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 >> mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 >> rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 >> cleanup_net+0x24c/0xb60 net/core/net_namespace.c:453 >> process_one_work+0xbfd/0x1bc0 kernel/workqueue.c:2113 >> worker_thread+0x223/0x1990 kernel/workqueue.c:2247 >> kthread+0x37a/0x440 kernel/kthread.c:238 >> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 >> >> Showing all locks held in the system: >> 2 locks held by khungtaskd/672: >> #0: (rcu_read_lock){....}, at: [<00000000b9bef8ab>] >> check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] >> #0: (rcu_read_lock){....}, at: [<00000000b9bef8ab>] watchdog+0x1c5/0xd60 >> kernel/hung_task.c:249 >> #1: (tasklist_lock){.+.+}, at: [<000000006d6acf8b>] >> debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 >> 1 lock held by rsyslogd/2970: >> #0: (&f->f_pos_lock){+.+.}, at: [<000000001cede688>] >> __fdget_pos+0x131/0x1a0 fs/file.c:765 >> 2 locks held by getty/3052: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 2 locks held by getty/3053: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 2 locks held by getty/3054: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 2 locks held by getty/3055: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 2 locks held by getty/3056: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 2 locks held by getty/3057: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 2 locks held by getty/3058: >> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >> 1 lock held by syz-executor2/3320: >> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >> net/core/rtnetlink.c:74 >> 4 locks held by kworker/u4:11/3785: >> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >> __write_once_size include/linux/compiler.h:212 [inline] >> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >> atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] >> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >> atomic_long_set include/asm-generic/atomic-long.h:57 [inline] >> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >> set_work_data kernel/workqueue.c:619 [inline] >> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >> set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] >> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >> process_one_work+0xad4/0x1bc0 kernel/workqueue.c:2084 >> #1: (net_cleanup_work){+.+.}, at: [<000000008a817b5c>] >> process_one_work+0xb2f/0x1bc0 kernel/workqueue.c:2088 >> #2: (net_mutex){+.+.}, at: [<0000000079150fd8>] cleanup_net+0x247/0xb60 >> net/core/net_namespace.c:450 >> #3: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >> net/core/rtnetlink.c:74 >> 3 locks held by kworker/0:6/14978: >> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >> __write_once_size include/linux/compiler.h:212 [inline] >> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >> atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] >> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >> atomic_long_set include/asm-generic/atomic-long.h:57 [inline] >> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >> set_work_data kernel/workqueue.c:619 [inline] >> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >> set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] >> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >> process_one_work+0xad4/0x1bc0 kernel/workqueue.c:2084 >> #1: ((addr_chk_work).work){+.+.}, at: [<000000008a817b5c>] >> process_one_work+0xb2f/0x1bc0 kernel/workqueue.c:2088 >> #2: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >> net/core/rtnetlink.c:74 >> 1 lock held by syz-executor2/15852: >> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >> net/core/rtnetlink.c:74 >> 1 lock held by syz-executor7/15958: >> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >> net/core/rtnetlink.c:74 >> 1 lock held by syz-executor7/15961: >> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >> net/core/rtnetlink.c:74 >> >> ============================================= >> >> NMI backtrace for cpu 1 >> CPU: 1 PID: 672 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171207+ #61 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> Call Trace: >> __dump_stack lib/dump_stack.c:17 [inline] >> dump_stack+0x194/0x257 lib/dump_stack.c:53 >> nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 >> nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62 >> arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 >> trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] >> check_hung_task kernel/hung_task.c:132 [inline] >> check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] >> watchdog+0x90c/0xd60 kernel/hung_task.c:249 >> kthread+0x37a/0x440 kernel/kthread.c:238 >> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 >> Sending NMI from CPU 1 to CPUs 0: >> NMI backtrace for cpu 0 >> CPU: 0 PID: 15938 Comm: syz-executor7 Not tainted 4.15.0-rc2-next-20171207+ >> #61 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> RIP: 0010:inb arch/x86/include/asm/io.h:348 [inline] >> RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:434 >> RSP: 0018:ffff8801c1c173e8 EFLAGS: 00000002 >> RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 >> RDX: 00000000000003fd RSI: ffffc90001c88000 RDI: ffffffff880fa9c0 >> RBP: ffff8801c1c173f8 R08: 0000000000000002 R09: 000000000000000c >> R10: 0000000000000000 R11: ffffffff87896d20 R12: ffffffff880fa980 >> R13: 0000000000000020 R14: fffffbfff101f577 R15: fffffbfff101f53a >> FS: 00007f1ef8fad700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00007fbea91b6000 CR3: 00000001d0aaa000 CR4: 00000000001406f0 >> DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000020001020 >> DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 >> Call Trace: >> serial_in drivers/tty/serial/8250/8250.h:111 [inline] >> wait_for_xmitr+0x93/0x1e0 drivers/tty/serial/8250/8250_port.c:2033 >> serial8250_console_putchar+0x1f/0x60 >> drivers/tty/serial/8250/8250_port.c:3170 >> uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858 >> serial8250_console_write+0x647/0xa20 >> drivers/tty/serial/8250/8250_port.c:3236 >> univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 >> call_console_drivers kernel/printk/printk.c:1574 [inline] >> console_unlock+0x788/0xd70 kernel/printk/printk.c:2233 >> vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757 >> vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 >> vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 >> printk+0xaa/0xca kernel/printk/printk.c:1829 >> __dev_set_promiscuity+0x2a4/0x630 net/core/dev.c:6609 >> __dev_change_flags+0x559/0x990 net/core/dev.c:6826 >> dev_change_flags+0x88/0x140 net/core/dev.c:6886 >> dev_ifsioc+0x60d/0x9b0 net/core/dev_ioctl.c:257 >> dev_ioctl+0x2c2/0xf90 net/core/dev_ioctl.c:566 >> sock_do_ioctl+0x94/0xb0 net/socket.c:971 >> sock_ioctl+0x2c2/0x440 net/socket.c:1061 >> vfs_ioctl fs/ioctl.c:46 [inline] >> do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 >> SYSC_ioctl fs/ioctl.c:701 [inline] >> SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 >> entry_SYSCALL_64_fastpath+0x1f/0x96 >> RIP: 0033:0x452a39 >> RSP: 002b:00007f1ef8facc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 >> RAX: ffffffffffffffda RBX: 00007f1ef8fad700 RCX: 0000000000452a39 >> RDX: 00000000208a3fe0 RSI: 0000000000008914 RDI: 0000000000000019 >> RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 >> R13: 0000000000a6f7ff R14: 00007f1ef8fad9c0 R15: 0000000000000002 >> Code: 24 d9 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa >> 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 40 89 da ec <5b> 0f b6 c0 41 >> 5c 5d c3 e8 88 ad 18 ff eb c2 e8 e1 ad 18 ff eb > > > This looks like +rtnetlink issue. Perhaps related to / fixed by: http://patchwork.ozlabs.org/patch/850957/ ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: INFO: task hung in cleanup_net 2017-12-19 18:17 ` David Ahern @ 2017-12-28 13:56 ` Dmitry Vyukov 0 siblings, 0 replies; 3+ messages in thread From: Dmitry Vyukov @ 2017-12-28 13:56 UTC (permalink / raw) To: David Ahern Cc: syzbot, LKML, Ingo Molnar, Peter Zijlstra, syzkaller-bugs, David Miller, Florian Westphal, Daniel Borkmann, Xin Long, jakub.kicinski, mschiffer, Vladislav Yasevich, Jiri Benc, netdev On Tue, Dec 19, 2017 at 7:17 PM, David Ahern <dsahern@gmail.com> wrote: > On 12/19/17 5:47 AM, Dmitry Vyukov wrote: >> On Tue, Dec 19, 2017 at 1:33 PM, syzbot >> <bot+b17f10c8a8c693b40723d40d6553fbc54d197679@syzkaller.appspotmail.com> >> wrote: >>> Hello, >>> >>> syzkaller hit the following crash on >>> e40fd8d6b4d9f59b160faa1736f78fc07533ff37 >>> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master >>> compiler: gcc (GCC) 7.1.1 20170620 >>> .config is attached >>> Raw console output is attached. >>> >>> Unfortunately, I don't have any reproducer for this bug yet. >>> >>> >>> sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default >>> minimum of 512 >>> sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default >>> minimum of 512 >>> sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default >>> minimum of 512 >>> INFO: task kworker/u4:11:3785 blocked for more than 120 seconds. >>> Not tainted 4.15.0-rc2-next-20171207+ #61 >>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> kworker/u4:11 D16448 3785 2 0x80000000 >>> Workqueue: netns cleanup_net >>> Call Trace: >>> context_switch kernel/sched/core.c:2800 [inline] >>> __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 >>> schedule+0xf5/0x430 kernel/sched/core.c:3435 >>> schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3493 >>> __mutex_lock_common kernel/locking/mutex.c:833 [inline] >>> __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 >>> mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 >>> rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 >>> cleanup_net+0x24c/0xb60 net/core/net_namespace.c:453 >>> process_one_work+0xbfd/0x1bc0 kernel/workqueue.c:2113 >>> worker_thread+0x223/0x1990 kernel/workqueue.c:2247 >>> kthread+0x37a/0x440 kernel/kthread.c:238 >>> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 >>> >>> Showing all locks held in the system: >>> 2 locks held by khungtaskd/672: >>> #0: (rcu_read_lock){....}, at: [<00000000b9bef8ab>] >>> check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] >>> #0: (rcu_read_lock){....}, at: [<00000000b9bef8ab>] watchdog+0x1c5/0xd60 >>> kernel/hung_task.c:249 >>> #1: (tasklist_lock){.+.+}, at: [<000000006d6acf8b>] >>> debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 >>> 1 lock held by rsyslogd/2970: >>> #0: (&f->f_pos_lock){+.+.}, at: [<000000001cede688>] >>> __fdget_pos+0x131/0x1a0 fs/file.c:765 >>> 2 locks held by getty/3052: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 2 locks held by getty/3053: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 2 locks held by getty/3054: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 2 locks held by getty/3055: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 2 locks held by getty/3056: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 2 locks held by getty/3057: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 2 locks held by getty/3058: >>> #0: (&tty->ldisc_sem){++++}, at: [<000000004e0245ba>] >>> ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 >>> #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ff863b18>] >>> n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 >>> 1 lock held by syz-executor2/3320: >>> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >>> net/core/rtnetlink.c:74 >>> 4 locks held by kworker/u4:11/3785: >>> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >>> __write_once_size include/linux/compiler.h:212 [inline] >>> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >>> atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] >>> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >>> atomic_long_set include/asm-generic/atomic-long.h:57 [inline] >>> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >>> set_work_data kernel/workqueue.c:619 [inline] >>> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >>> set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] >>> #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000087d81703>] >>> process_one_work+0xad4/0x1bc0 kernel/workqueue.c:2084 >>> #1: (net_cleanup_work){+.+.}, at: [<000000008a817b5c>] >>> process_one_work+0xb2f/0x1bc0 kernel/workqueue.c:2088 >>> #2: (net_mutex){+.+.}, at: [<0000000079150fd8>] cleanup_net+0x247/0xb60 >>> net/core/net_namespace.c:450 >>> #3: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >>> net/core/rtnetlink.c:74 >>> 3 locks held by kworker/0:6/14978: >>> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >>> __write_once_size include/linux/compiler.h:212 [inline] >>> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >>> atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] >>> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >>> atomic_long_set include/asm-generic/atomic-long.h:57 [inline] >>> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >>> set_work_data kernel/workqueue.c:619 [inline] >>> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >>> set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] >>> #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000087d81703>] >>> process_one_work+0xad4/0x1bc0 kernel/workqueue.c:2084 >>> #1: ((addr_chk_work).work){+.+.}, at: [<000000008a817b5c>] >>> process_one_work+0xb2f/0x1bc0 kernel/workqueue.c:2088 >>> #2: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >>> net/core/rtnetlink.c:74 >>> 1 lock held by syz-executor2/15852: >>> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >>> net/core/rtnetlink.c:74 >>> 1 lock held by syz-executor7/15958: >>> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >>> net/core/rtnetlink.c:74 >>> 1 lock held by syz-executor7/15961: >>> #0: (rtnl_mutex){+.+.}, at: [<0000000063c47ced>] rtnl_lock+0x17/0x20 >>> net/core/rtnetlink.c:74 >>> >>> ============================================= >>> >>> NMI backtrace for cpu 1 >>> CPU: 1 PID: 672 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171207+ #61 >>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >>> Google 01/01/2011 >>> Call Trace: >>> __dump_stack lib/dump_stack.c:17 [inline] >>> dump_stack+0x194/0x257 lib/dump_stack.c:53 >>> nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 >>> nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62 >>> arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 >>> trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] >>> check_hung_task kernel/hung_task.c:132 [inline] >>> check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] >>> watchdog+0x90c/0xd60 kernel/hung_task.c:249 >>> kthread+0x37a/0x440 kernel/kthread.c:238 >>> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 >>> Sending NMI from CPU 1 to CPUs 0: >>> NMI backtrace for cpu 0 >>> CPU: 0 PID: 15938 Comm: syz-executor7 Not tainted 4.15.0-rc2-next-20171207+ >>> #61 >>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >>> Google 01/01/2011 >>> RIP: 0010:inb arch/x86/include/asm/io.h:348 [inline] >>> RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:434 >>> RSP: 0018:ffff8801c1c173e8 EFLAGS: 00000002 >>> RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 >>> RDX: 00000000000003fd RSI: ffffc90001c88000 RDI: ffffffff880fa9c0 >>> RBP: ffff8801c1c173f8 R08: 0000000000000002 R09: 000000000000000c >>> R10: 0000000000000000 R11: ffffffff87896d20 R12: ffffffff880fa980 >>> R13: 0000000000000020 R14: fffffbfff101f577 R15: fffffbfff101f53a >>> FS: 00007f1ef8fad700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 00007fbea91b6000 CR3: 00000001d0aaa000 CR4: 00000000001406f0 >>> DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000020001020 >>> DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 >>> Call Trace: >>> serial_in drivers/tty/serial/8250/8250.h:111 [inline] >>> wait_for_xmitr+0x93/0x1e0 drivers/tty/serial/8250/8250_port.c:2033 >>> serial8250_console_putchar+0x1f/0x60 >>> drivers/tty/serial/8250/8250_port.c:3170 >>> uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858 >>> serial8250_console_write+0x647/0xa20 >>> drivers/tty/serial/8250/8250_port.c:3236 >>> univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 >>> call_console_drivers kernel/printk/printk.c:1574 [inline] >>> console_unlock+0x788/0xd70 kernel/printk/printk.c:2233 >>> vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757 >>> vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 >>> vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 >>> printk+0xaa/0xca kernel/printk/printk.c:1829 >>> __dev_set_promiscuity+0x2a4/0x630 net/core/dev.c:6609 >>> __dev_change_flags+0x559/0x990 net/core/dev.c:6826 >>> dev_change_flags+0x88/0x140 net/core/dev.c:6886 >>> dev_ifsioc+0x60d/0x9b0 net/core/dev_ioctl.c:257 >>> dev_ioctl+0x2c2/0xf90 net/core/dev_ioctl.c:566 >>> sock_do_ioctl+0x94/0xb0 net/socket.c:971 >>> sock_ioctl+0x2c2/0x440 net/socket.c:1061 >>> vfs_ioctl fs/ioctl.c:46 [inline] >>> do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 >>> SYSC_ioctl fs/ioctl.c:701 [inline] >>> SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 >>> entry_SYSCALL_64_fastpath+0x1f/0x96 >>> RIP: 0033:0x452a39 >>> RSP: 002b:00007f1ef8facc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 >>> RAX: ffffffffffffffda RBX: 00007f1ef8fad700 RCX: 0000000000452a39 >>> RDX: 00000000208a3fe0 RSI: 0000000000008914 RDI: 0000000000000019 >>> RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000 >>> R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 >>> R13: 0000000000a6f7ff R14: 00007f1ef8fad9c0 R15: 0000000000000002 >>> Code: 24 d9 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa >>> 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 40 89 da ec <5b> 0f b6 c0 41 >>> 5c 5d c3 e8 88 ad 18 ff eb c2 e8 e1 ad 18 ff eb >> >> >> This looks like +rtnetlink issue. > > Perhaps related to / fixed by: http://patchwork.ozlabs.org/patch/850957/ If you think so, let's tell syzbot about it: #syz fix: net: Fix double free and memory corruption in get_net_ns_by_id() ^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-12-19 12:47 ` INFO: task hung in cleanup_net Dmitry Vyukov
2017-12-19 18:17 ` David Ahern
2017-12-28 13:56 ` Dmitry Vyukov
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