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Cc: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Message-Id: <2AB60EFF-1B62-43C7-B47D-00E2414806D3@gmail.com> References: <685af60a.a00a0220.2e5631.0093.GAE@google.com> To: syzbot X-Mailer: Apple Mail (2.3826.500.181.1.5) On Jun 25, 2025, at 03:01, syzbot = wrote: >=20 > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: b67ec639010f Merge tag 'i2c-for-6.16-rc3' of = git://git.ker.. > git tree: upstream > console output: = https://syzkaller.appspot.com/x/log.txt?x=3D15e46182580000 > kernel config: = https://syzkaller.appspot.com/x/.config?x=3D6a237c32900fc479 > dashboard link: = https://syzkaller.appspot.com/bug?extid=3Dd25751466d56160d8892 > compiler: Debian clang version 20.1.6 = (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD = 20.1.6 > syz repro: = https://syzkaller.appspot.com/x/repro.syz?x=3D15c46b0c580000 > C reproducer: = https://syzkaller.appspot.com/x/repro.c?x=3D1243db0c580000 >=20 > Downloadable assets: > disk image: = https://storage.googleapis.com/syzbot-assets/dbd84edd9de7/disk-b67ec639.ra= w.xz > vmlinux: = https://storage.googleapis.com/syzbot-assets/388ad319d5bf/vmlinux-b67ec639= .xz > kernel image: = https://storage.googleapis.com/syzbot-assets/961e022f7367/bzImage-b67ec639= .xz > mounted in repro: = https://storage.googleapis.com/syzbot-assets/0c8167f99e04/mount_0.gz >=20 > The issue was bisected to: >=20 > commit e14e06e91dadcd1c65f08ba5a02716d3e855fc74 > Author: Kent Overstreet > Date: Sun Apr 20 15:27:18 2025 +0000 >=20 > bcachefs: __bch2_fs_read_write() no longer depends on io_ref >=20 > bisection log: = https://syzkaller.appspot.com/x/bisect.txt?x=3D12636182580000 > final oops: = https://syzkaller.appspot.com/x/report.txt?x=3D11636182580000 > console output: = https://syzkaller.appspot.com/x/log.txt?x=3D16636182580000 >=20 > IMPORTANT: if you fix the issue, please add the following tag to the = commit: > Reported-by: syzbot+d25751466d56160d8892@syzkaller.appspotmail.com > Fixes: e14e06e91dad ("bcachefs: __bch2_fs_read_write() no longer = depends on io_ref") >=20 > INFO: task syz-executor198:6265 blocked for more than 143 seconds. > Not tainted 6.16.0-rc2-syzkaller-00378-gb67ec639010f #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this = message. > task:syz-executor198 state:D stack:27144 pid:6265 tgid:6239 = ppid:5854 task_flags:0x400140 flags:0x00004006 > Call Trace: > > context_switch kernel/sched/core.c:5396 [inline] > __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 > __schedule_loop kernel/sched/core.c:6863 [inline] > schedule+0x165/0x360 kernel/sched/core.c:6878 > io_schedule+0x81/0xe0 kernel/sched/core.c:7723 > folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317 > folio_lock include/linux/pagemap.h:1114 [inline] > truncate_inode_pages_range+0xa77/0xda0 mm/truncate.c:433 > bchfs_fpunch+0x1d8/0x520 fs/bcachefs/fs-io.c:570 > bch2_fallocate_dispatch+0x2bc/0x410 fs/bcachefs/fs-io.c:838 > vfs_fallocate+0x6a0/0x830 fs/open.c:341 > ksys_fallocate fs/open.c:365 [inline] > __do_sys_fallocate fs/open.c:370 [inline] > __se_sys_fallocate fs/open.c:368 [inline] > __x64_sys_fallocate+0xc0/0x110 fs/open.c:368 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fd2b7703d79 > RSP: 002b:00007fd2b768f218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d > RAX: ffffffffffffffda RBX: 00007fd2b778a6d8 RCX: 00007fd2b7703d79 > RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 > RBP: 00007fd2b778a6d0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000404042bbe R11: 0000000000000246 R12: 00007fd2b7756ba4 > R13: 0000200000000040 R14: 0031656c69662f2e R15: 00002000000005c0 > > INFO: task syz-executor198:6269 blocked for more than 143 seconds. > Not tainted 6.16.0-rc2-syzkaller-00378-gb67ec639010f #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this = message. > task:syz-executor198 state:D stack:26872 pid:6269 tgid:6239 = ppid:5854 task_flags:0x440040 flags:0x00004006 > Call Trace: > > context_switch kernel/sched/core.c:5396 [inline] > __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 > __schedule_loop kernel/sched/core.c:6863 [inline] > schedule+0x165/0x360 kernel/sched/core.c:6878 > __bch2_two_state_lock+0x1ea/0x370 = fs/bcachefs/two_state_shared_lock.c:7 > bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline] > bch2_readahead+0x94f/0x1100 fs/bcachefs/fs-io-buffered.c:296 > read_pages+0x177/0x580 mm/readahead.c:160 > page_cache_ra_order+0xa24/0xc70 mm/readahead.c:515 > filemap_get_pages+0x43c/0x1ea0 mm/filemap.c:2602 > filemap_splice_read+0x4fc/0xbc0 mm/filemap.c:2990 > do_splice_read fs/splice.c:979 [inline] > splice_direct_to_actor+0x4a9/0xcc0 fs/splice.c:1083 > do_splice_direct_actor fs/splice.c:1201 [inline] > do_splice_direct+0x181/0x270 fs/splice.c:1227 > do_sendfile+0x4da/0x7e0 fs/read_write.c:1370 > __do_sys_sendfile64 fs/read_write.c:1431 [inline] > __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fd2b7703d79 > RSP: 002b:00007fd2b766e218 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007fd2b778a6e8 RCX: 00007fd2b7703d79 > RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 > RBP: 00007fd2b778a6e0 R08: 00007ffd4f811977 R09: 0000000000000000 > R10: 000000000e3aa6ea R11: 0000000000000246 R12: 00007fd2b7756ba4 > R13: 0000200000000040 R14: 0031656c69662f2e R15: 00002000000005c0 > >=20 > Showing all locks held in the system: > 1 lock held by khungtaskd/31: > #0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3} > , at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] > , at: rcu_read_lock include/linux/rcupdate.h:841 [inline] > , at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 > 2 locks held by getty/5582: > #0: ffff8880358620a0 (&tty->ldisc_sem){++++}-{0:0}, at: = tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 > #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: = n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 > 2 locks held by syz-executor198/5856: > 3 locks held by syz-executor198/5857: > #0: ffff88803537c0e0 (&type->s_umount_key#43){+.+.}-{4:4}, at: = __super_lock fs/super.c:57 [inline] > #0: ffff88803537c0e0 (&type->s_umount_key#43){+.+.}-{4:4}, at: = __super_lock_excl fs/super.c:72 [inline] > #0: ffff88803537c0e0 (&type->s_umount_key#43){+.+.}-{4:4}, at: = deactivate_super+0xa9/0xe0 fs/super.c:506 > #1: ffff8880a2380278 (&c->state_lock){+.+.}-{4:4}, at: = __bch2_fs_stop+0xf8/0x900 fs/bcachefs/super.c:677 > #2: ffffffff8e144978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: = exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline] > #2: ffffffff8e144978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: = synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:998 > 2 locks held by syz-executor198/6265: > #0: ffff888076150428 (sb_writers#9){.+.+}-{0:0}, at: file_start_write = include/linux/fs.h:3096 [inline] > #0: ffff888076150428 (sb_writers#9){.+.+}-{0:0}, at: = vfs_fallocate+0x62a/0x830 fs/open.c:340 > #1: ffff888078499fa8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: = inode_lock include/linux/fs.h:869 [inline] > #1: ffff888078499fa8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: = bch2_fallocate_dispatch+0x10e/0x410 fs/bcachefs/fs-io.c:827 > 1 lock held by syz-executor198/6269: > #0: ffff88807849a148 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: = filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] > #0: ffff88807849a148 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: = page_cache_ra_order+0x445/0xc70 mm/readahead.c:491 > 2 locks held by syz-executor198/7079: > #0: ffff888028336428 (sb_writers#9){.+.+}-{0:0}, at: file_start_write = include/linux/fs.h:3096 [inline] > #0: ffff888028336428 (sb_writers#9){.+.+}-{0:0}, at: = vfs_fallocate+0x62a/0x830 fs/open.c:340 > #1: ffff88807dd5d4d0 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: = inode_lock include/linux/fs.h:869 [inline] > #1: ffff88807dd5d4d0 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: = bch2_fallocate_dispatch+0x10e/0x410 fs/bcachefs/fs-io.c:827 > 1 lock held by syz-executor198/7080: > #0: ffff88807dd5d670 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: = filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] > #0: ffff88807dd5d670 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: = page_cache_ra_order+0x445/0xc70 mm/readahead.c:491 > 1 lock held by syz-executor198/9504: >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 > NMI backtrace for cpu 1 > CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted = 6.16.0-rc2-syzkaller-00378-gb67ec639010f #0 PREEMPT(full)=20 > Hardware name: Google Google Compute Engine/Google Compute Engine, = BIOS Google 05/07/2025 > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 > nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] > watchdog+0xfee/0x1030 kernel/hung_task.c:470 > kthread+0x70e/0x8a0 kernel/kthread.c:464 > ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 UID: 0 PID: 5857 Comm: syz-executor198 Not tainted = 6.16.0-rc2-syzkaller-00378-gb67ec639010f #0 PREEMPT(full)=20 > Hardware name: Google Google Compute Engine/Google Compute Engine, = BIOS Google 05/07/2025 > RIP: 0010:nearest_obj mm/slab.h:331 [inline] > RIP: 0010:kasan_record_aux_stack+0x62/0xd0 mm/kasan/generic.c:542 > Code: c2 0f 85 81 00 00 00 4c 8b 71 08 48 89 ce 48 2b 35 2b 09 97 0b = 48 c1 e6 06 48 03 35 10 09 97 0b 48 89 d8 48 29 f0 41 8b 7e 18 <48> 89 = c2 48 c1 ea 20 74 07 48 99 48 f7 ff eb 04 31 d2 f7 f7 48 29 > RSP: 0018:ffffc90000007ab0 EFLAGS: 00000002 > RAX: 00000000000002d0 RBX: ffff8880247b82d0 RCX: ffffea000091ee00 > RDX: fffffffde89b8200 RSI: ffff8880247b8000 RDI: 0000000000000800 > RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff817451d8 > R10: dffffc0000000000 R11: fffffbfff3399595 R12: dffffc0000000000 > R13: ffff88801a49cc00 R14: ffff88801a441dc0 R15: ffff8880b86395e0 > FS: 000055555795f3c0(0000) GS:ffff888125c85000(0000) = knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f5a35185000 CR3: 00000000723be000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > insert_work+0x3d/0x330 kernel/workqueue.c:2183 > __queue_work+0xcfc/0xfe0 kernel/workqueue.c:2341 > call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747 > expire_timers kernel/time/timer.c:1793 [inline] > __run_timers kernel/time/timer.c:2372 [inline] > __run_timer_base+0x646/0x860 kernel/time/timer.c:2384 > run_timer_base kernel/time/timer.c:2393 [inline] > run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 > handle_softirqs+0x286/0x870 kernel/softirq.c:579 > __do_softirq kernel/softirq.c:613 [inline] > invoke_softirq kernel/softirq.c:453 [inline] > __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 = [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 > > > asm_sysvec_apic_timer_interrupt+0x1a/0x20 = arch/x86/include/asm/idtentry.h:702 > RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 = [inline] > RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449 > Code: 85 32 01 00 00 e8 91 62 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 = 07 e8 80 62 1f 00 eb 06 e8 79 62 1f 00 fb 48 c7 c7 e0 30 13 8e <31> f6 = ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 36 > RSP: 0018:ffffc900043f7820 EFLAGS: 00000293 > RAX: ffffffff81a0e9a7 RBX: ffffffff81a0e864 RCX: ffff88802904da00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e1330e0 > RBP: ffffc900043f7930 R08: ffffffff8f9fe0f7 R09: 1ffffffff1f3fc1e > R10: dffffc0000000000 R11: fffffbfff1f3fc1f R12: dffffc0000000000 > R13: 1ffff9200087ef08 R14: 0000000000000200 R15: 0000000000000052 > bch2_print_maybe_redirect fs/bcachefs/super.c:137 [inline] > __bch2_print+0x176/0x220 fs/bcachefs/super.c:156 > __bch2_fs_read_only+0x271/0x5b0 fs/bcachefs/super.c:300 > bch2_fs_read_only+0x42a/0xb00 fs/bcachefs/super.c:367 > __bch2_fs_stop+0x100/0x900 fs/bcachefs/super.c:678 > generic_shutdown_super+0x135/0x2c0 fs/super.c:643 > bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618 > deactivate_locked_super+0xb9/0x130 fs/super.c:474 > cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417 > task_work_run+0x1d1/0x260 kernel/task_work.c:227 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114 > exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] > syscall_exit_to_user_mode_work include/linux/entry-common.h:414 = [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] > do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fd2b7704fd7 > Code: 08 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 = 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d = 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 > RSP: 002b:00007ffd4f810968 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 > RAX: 0000000000000000 RBX: 00000000000664e4 RCX: 00007fd2b7704fd7 > RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd4f810a20 > RBP: 00007ffd4f810a20 R08: 0000000000000000 R09: 0000000000000000 > R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffd4f811ae0 > R13: 0000555557960700 R14: 431bde82d7b634db R15: 00007ffd4f811a84 > >=20 >=20 > --- > 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. >=20 > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: = https://goo.gl/tpsmEJ#bisection >=20 > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title >=20 > 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. >=20 > 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) >=20 > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report >=20 > If you want to undo deduplication, reply with: > #syz undup >=20 #syz fix: bcachefs: Fix readahead involved deadlock