Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
---|---|---|---|---|---|---|---|---|
possible deadlock in __io_commit_cqring_flush fs | 10 | 1044d | 1046d | 28/28 | closed as dup on 2021/11/26 14:28 |
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Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
---|---|---|---|---|---|---|---|---|
possible deadlock in __io_commit_cqring_flush fs | 10 | 1044d | 1046d | 28/28 | closed as dup on 2021/11/26 14:28 |
Title | Replies (including bot) | Last reply |
---|---|---|
[PATCH 5.15 000/179] 5.15.6-rc1 review | 189 (189) | 2021/12/01 02:29 |
[PATCH 0/2] 5.16 fixes for syz reports | 6 (6) | 2021/11/26 15:36 |
[syzbot] possible deadlock in io_flush_timeouts | 0 (1) | 2021/11/26 11:49 |
ubi: mtd0 is already attached to ubi0 ============================================ WARNING: possible recursive locking detected 5.16.0-rc2-syzkaller #0 Not tainted -------------------------------------------- syz-executor.3/16931 is trying to acquire lock: ffff888089eac418 (&ctx->timeout_lock){+.+.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:374 [inline] ffff888089eac418 (&ctx->timeout_lock){+.+.}-{2:2}, at: io_flush_timeouts+0x80/0x34c fs/io_uring.c:1587 but task is already holding lock: ffff888089eac418 (&ctx->timeout_lock){+.+.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:374 [inline] ffff888089eac418 (&ctx->timeout_lock){+.+.}-{2:2}, at: io_poll_remove_all+0x49/0x319 fs/io_uring.c:5702 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&ctx->timeout_lock); lock(&ctx->timeout_lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.3/16931: #0: ffff888089eac3d8 (&ctx->completion_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] #0: ffff888089eac3d8 (&ctx->completion_lock){+.+.}-{2:2}, at: io_poll_remove_all+0x38/0x319 fs/io_uring.c:5701 #1: ffff888089eac418 (&ctx->timeout_lock){+.+.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:374 [inline] #1: ffff888089eac418 (&ctx->timeout_lock){+.+.}-{2:2}, at: io_poll_remove_all+0x49/0x319 fs/io_uring.c:5702 stack backtrace: CPU: 1 PID: 16931 Comm: syz-executor.3 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_deadlock_bug kernel/locking/lockdep.c:2956 [inline] check_deadlock kernel/locking/lockdep.c:2999 [inline] validate_chain+0x5984/0x8240 kernel/locking/lockdep.c:3788 __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5027 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5637 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:374 [inline] io_flush_timeouts+0x80/0x34c fs/io_uring.c:1587 __io_commit_cqring_flush+0x80/0xbf fs/io_uring.c:1618 io_commit_cqring fs/io_uring.c:1626 [inline] io_poll_remove_one+0x4bd/0x610 fs/io_uring.c:5684 io_poll_remove_all+0x24c/0x319 fs/io_uring.c:5709 io_ring_ctx_wait_and_kill+0x22c/0x36a fs/io_uring.c:9534 io_uring_release+0x59/0x63 fs/io_uring.c:9554 __fput+0x3fc/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe5fdfc5b32 Code: 00 00 00 00 00 0f 1f 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 3b 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 5b 5d c3 0f 1f 00 48 c7 c0 bc ff ff ff 64 RSP: 002b:00007fe5fb53b0f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: 00000000206d4000 RBX: 0000000000008011 RCX: 00007fe5fdfc5b32 RDX: 0000000000000003 RSI: 0000000000004000 RDI: 00000000206d4000 RBP: 00000000206d4000 R08: 0000000000000004 R09: 0000000010000000 R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020000140 R13: 00000000206d4000 R14: 0000000020000000 R15: 0000000020ee7000 </TASK>
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2021/11/27 18:40 | upstream | c5c17547b778 | 63eeac02 | .config | console log | report | info | ci-upstream-kasan-gce-smack-root | possible deadlock in io_flush_timeouts | |||
2021/11/27 17:00 | upstream | c5c17547b778 | 63eeac02 | .config | console log | report | info | ci-upstream-kasan-gce-smack-root | possible deadlock in io_flush_timeouts | |||
2021/11/26 12:21 | upstream | a4849f6000e2 | 63eeac02 | .config | console log | report | info | ci-upstream-kasan-gce-smack-root | possible deadlock in io_flush_timeouts | |||
2021/11/26 10:25 | upstream | a4849f6000e2 | 63eeac02 | .config | console log | report | info | ci-upstream-kasan-gce-smack-root | possible deadlock in io_flush_timeouts | |||
2021/11/26 09:54 | upstream | a4849f6000e2 | 63eeac02 | .config | console log | report | info | ci-upstream-kasan-gce-smack-root | possible deadlock in io_flush_timeouts |