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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a85:b0:3ce:793e:2766 with SMTP id e9e14a558f8ab-3cf748a7c8emr7874715ab.8.1737096507355; Thu, 16 Jan 2025 22:48:27 -0800 (PST) Date: Thu, 16 Jan 2025 22:48:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6789fd3b.050a0220.20d369.0055.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in netlink_release (5) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 47e55e4b410f openvswitch: fix lockup on tx to unregisterin.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=1106ebc4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ef22c4fce5135b4 dashboard link: https://syzkaller.appspot.com/bug?extid=9a69946171ff3136f79f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15ddbef8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/17f83134d012/disk-47e55e4b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ba503c38dcef/vmlinux-47e55e4b.xz kernel image: https://storage.googleapis.com/syzbot-assets/bc2734a7d207/bzImage-47e55e4b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9a69946171ff3136f79f@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5847/1:b..l P1324/1:b..l rcu: (detected by 0, t=10503 jiffies, g=20025, q=335 ncpus=2) task:kworker/u8:6 state:R running task stack:22896 pid:1324 tgid:1324 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_stack_walk+0x123/0x150 arch/x86/kernel/stacktrace.c:24 Code: b3 ae 09 00 48 85 c0 74 23 4c 89 f7 48 89 c6 4d 89 eb 41 ff d3 66 90 84 c0 74 11 48 89 df e8 e4 af 09 00 83 bd 70 ff ff ff 00 <75> d0 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 13 48 83 c4 68 5b RSP: 0018:ffffc900047af200 EFLAGS: 00000202 RAX: 0000000080000001 RBX: ffffc900047af200 RCX: 0000000080000000 RDX: dffffc0000000000 RSI: ffffc900047a8000 RDI: 0000000000000001 RBP: ffffc900047af290 R08: ffffc900047af600 R09: 0000000000000000 R10: ffffc900047af250 R11: fffff520008f5e4c R12: ffff888027d73c00 R13: ffffffff818b4a10 R14: ffffc900047af2e0 R15: 0000000000000000 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659 discard_slab mm/slub.c:2688 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3157 put_cpu_partial+0x17c/0x250 mm/slub.c:3232 __slab_free+0x290/0x380 mm/slub.c:4483 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] __kmalloc_cache_noprof+0x1d9/0x390 mm/slub.c:4324 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] ref_tracker_alloc+0x14b/0x490 lib/ref_tracker.c:203 __netns_tracker_alloc include/net/net_namespace.h:341 [inline] netlink_release+0x16d3/0x1bf0 net/netlink/af_netlink.c:805 __sock_release net/socket.c:640 [inline] sock_release+0x82/0x150 net/socket.c:668 crypto_netlink_exit+0x40/0x60 crypto/crypto_user.c:498 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x802/0xd50 net/core/net_namespace.c:648 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 task:syz-executor state:R running task stack:20528 pid:5847 tgid:5847 ppid:5841 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__reset_page_owner+0x5e/0x430 mm/page_owner.c:295 Code: 84 93 03 00 00 49 89 c7 49 bd 00 00 00 00 00 fc ff df 48 8b 05 13 78 97 0c 49 8d 5c 07 08 48 89 d8 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 8d 03 00 00 8b 03 89 44 24 20 bf 00 28 00 00 e8 ca 03 RSP: 0018:ffffc9000419f8e8 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffff88801d481d90 RCX: ffff88807ea18000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffea0001267e00 R08: ffffffff8211704a R09: 1ffffffff2854b10 R10: dffffc0000000000 R11: fffffbfff2854b11 R12: ffffea0001267e08 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88801d481d80 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659 discard_slab mm/slub.c:2688 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3157 put_cpu_partial+0x17c/0x250 mm/slub.c:3232 __slab_free+0x290/0x380 mm/slub.c:4483 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_lru_noprof+0x1dd/0x390 mm/slub.c:4187 __d_alloc+0x31/0x700 fs/dcache.c:1646 d_alloc_pseudo+0x1f/0xb0 fs/dcache.c:1778 alloc_path_pseudo fs/file_table.c:356 [inline] alloc_file_pseudo+0x123/0x290 fs/file_table.c:372 create_pipe_files+0x33e/0x700 fs/pipe.c:938 __do_pipe_flags+0x48/0x2d0 fs/pipe.c:973 do_pipe2+0xd4/0x310 fs/pipe.c:1024 __do_sys_pipe2 fs/pipe.c:1042 [inline] __se_sys_pipe2 fs/pipe.c:1040 [inline] __x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1040 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6300184a49 RSP: 002b:00007ffe9b066098 EFLAGS: 00000246 ORIG_RAX: 0000000000000125 RAX: ffffffffffffffda RBX: 0000555574264af0 RCX: 00007f6300184a49 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 00007ffe9b0660a8 RBP: 00007ffe9b066460 R08: 0000000000000007 R09: 0000555574267560 R10: 0f1fa1570a3a0d66 R11: 0000000000000246 R12: 00007ffe9b0664c0 R13: 0000555574266480 R14: 00007ffe9b0661e0 R15: 00005555742621f8 rcu: rcu_preempt kthread starved for 10562 jiffies! g20025 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:25616 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.13.0-rc6-syzkaller-00133-g47e55e4b410f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:preempt_count_add+0x44/0x190 kernel/sched/core.c:5851 Code: 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 ed 00 00 00 83 3d 8c 38 cd 18 00 75 07 65 8b 05 cb 44 96 7e 65 01 1d c4 44 96 7e <48> c7 c0 c0 c9 3a 9a 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e4 00 RSP: 0018:ffffc900001e7050 EFLAGS: 00000282 RAX: 0000000080000100 RBX: 0000000000000001 RCX: ffffffff9a3ac903 RDX: dffffc0000000000 RSI: ffffc900001e8000 RDI: 0000000000000001 RBP: ffffc900001e71d8 R08: ffffc900001e7101 R09: 0000000000000000 R10: ffffc900001e71a0 R11: fffff5200003ce40 R12: dffffc0000000000 R13: ffffc900001e71a0 R14: ffffffff814be168 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f62fee00218 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xb0/0x22d0 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kmem_cache_free+0x195/0x410 mm/slub.c:4715 skb_kfree_head net/core/skbuff.c:1084 [inline] skb_free_head net/core/skbuff.c:1098 [inline] skb_release_data+0x677/0x8a0 net/core/skbuff.c:1125 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb net/core/skbuff.c:1204 [inline] consume_skb+0x9f/0xf0 net/core/skbuff.c:1436 can_receive+0x3dc/0x480 net/can/af_can.c:669 canfd_rcv+0x144/0x260 net/can/af_can.c:703 __netif_receive_skb_one_core net/core/dev.c:5704 [inline] __netif_receive_skb+0x2e0/0x650 net/core/dev.c:5817 process_backlog+0x662/0x15b0 net/core/dev.c:6149 __napi_poll+0xcb/0x490 net/core/dev.c:6902 napi_poll net/core/dev.c:6971 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7093 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 run_ksoftirqd+0xca/0x130 kernel/softirq.c:950 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup