From: syzbot <[email protected]>
To: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
Subject: possible deadlock in io_poll_double_wake
Date: Sat, 15 Aug 2020 11:09:17 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: c9c9735c Merge tag 'scsi-misc' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=127399f6900000
kernel config: https://syzkaller.appspot.com/x/.config?x=adea84f38e7bc8d
dashboard link: https://syzkaller.appspot.com/bug?extid=0d56cfeec64f045baffc
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
============================================
WARNING: possible recursive locking detected
5.8.0-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.1/9155 is trying to acquire lock:
ffff8880a1fcc530 (&tty->write_wait){-.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
ffff8880a1fcc530 (&tty->write_wait){-.-.}-{2:2}, at: io_poll_double_wake+0x108/0x360 fs/io_uring.c:4599
but task is already holding lock:
ffff8880a1fcc530 (&tty->write_wait){-.-.}-{2:2}, at: __wake_up_common_lock kernel/sched/wait.c:122 [inline]
ffff8880a1fcc530 (&tty->write_wait){-.-.}-{2:2}, at: __wake_up+0xb8/0x150 kernel/sched/wait.c:142
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&tty->write_wait);
lock(&tty->write_wait);
*** DEADLOCK ***
May be due to missing lock nesting notation
4 locks held by syz-executor.1/9155:
#0: ffff8880a1fcc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:267
#1: ffff8880a1fcc2e8 (&tty->termios_rwsem){++++}-{3:3}, at: tty_set_termios+0xc5/0x1510 drivers/tty/tty_ioctl.c:328
#2: ffff8880a1fcc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x18/0x80 drivers/tty/tty_ldisc.c:288
#3: ffff8880a1fcc530 (&tty->write_wait){-.-.}-{2:2}, at: __wake_up_common_lock kernel/sched/wait.c:122 [inline]
#3: ffff8880a1fcc530 (&tty->write_wait){-.-.}-{2:2}, at: __wake_up+0xb8/0x150 kernel/sched/wait.c:142
stack backtrace:
CPU: 0 PID: 9155 Comm: syz-executor.1 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1f0/0x31e lib/dump_stack.c:118
print_deadlock_bug kernel/locking/lockdep.c:2391 [inline]
check_deadlock kernel/locking/lockdep.c:2432 [inline]
validate_chain+0x69a4/0x88a0 kernel/locking/lockdep.c:3202
__lock_acquire+0x1161/0x2ab0 kernel/locking/lockdep.c:4426
lock_acquire+0x160/0x730 kernel/locking/lockdep.c:5005
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
io_poll_double_wake+0x108/0x360 fs/io_uring.c:4599
__wake_up_common+0x30a/0x4e0 kernel/sched/wait.c:93
__wake_up_common_lock kernel/sched/wait.c:123 [inline]
__wake_up+0xd4/0x150 kernel/sched/wait.c:142
n_tty_set_termios+0xa60/0x1080 drivers/tty/n_tty.c:1874
tty_set_termios+0xcac/0x1510 drivers/tty/tty_ioctl.c:341
set_termios+0x4a1/0x580 drivers/tty/tty_ioctl.c:414
tty_mode_ioctl+0x7b2/0xa80 drivers/tty/tty_ioctl.c:770
tty_ioctl+0xf81/0x15c0 drivers/tty/tty_io.c:2665
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d239
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f063db5fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000017cc0 RCX: 000000000045d239
RDX: 0000000020000000 RSI: 0000000000005404 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffc7ff6341f R14: 00007f063db609c0 R15: 000000000118cf4c
---
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next reply other threads:[~2020-08-15 21:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-15 18:09 syzbot [this message]
2020-08-15 18:14 ` possible deadlock in io_poll_double_wake syzbot
2020-08-15 18:14 ` Jens Axboe
2020-08-15 18:15 ` syzbot
2020-08-15 18:15 ` syzbot
2020-08-15 18:15 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2021-10-14 2:45 Hao Sun
2022-08-30 13:33 Jiacheng Xu
2022-08-30 13:58 ` Jens Axboe
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