syzbot


possible deadlock in pipe_write

Status: upstream: reported C repro on 2022/03/21 02:34
Reported-by: syzbot+011e4ea1da6692cf881c@syzkaller.appspotmail.com
First crash: 442d, last: 3d03h

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: possible deadlock in pipe_write (log)
Repro: C syz .config
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] possible deadlock in pipe_write 3 (4) 2022/03/21 16:17
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 possible deadlock in pipe_write origin:upstream C 2 3d18h 3d19h 0/3 upstream: reported C repro on 2023/05/30 03:04
linux-6.1 possible deadlock in pipe_write 1 60d 60d 0/3 upstream: reported on 2023/04/03 17:51

Sample crash report:
============================================
WARNING: possible recursive locking detected
6.4.0-rc4-syzkaller-00031-g8b817fded42d #0 Not tainted
--------------------------------------------
syz-executor318/5002 is trying to acquire lock:
ffff88802838d068 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
ffff88802838d068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x140/0x1ca0 fs/pipe.c:432

but task is already holding lock:
ffff88802838c068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
ffff88802838c068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
ffff88802838c068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x39f/0x420 fs/pipe.c:1054

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&pipe->mutex/1);
  lock(&pipe->mutex/1);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

1 lock held by syz-executor318/5002:
 #0: ffff88802838c068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
 #0: ffff88802838c068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
 #0: ffff88802838c068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x39f/0x420 fs/pipe.c:1054

stack backtrace:
CPU: 1 PID: 5002 Comm: syz-executor318 Not tainted 6.4.0-rc4-syzkaller-00031-g8b817fded42d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_deadlock_bug kernel/locking/lockdep.c:3006 [inline]
 check_deadlock kernel/locking/lockdep.c:3049 [inline]
 validate_chain kernel/locking/lockdep.c:3834 [inline]
 __lock_acquire+0x13eb/0x5f30 kernel/locking/lockdep.c:5088
 lock_acquire kernel/locking/lockdep.c:5705 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_write+0x140/0x1ca0 fs/pipe.c:432
 call_write_iter include/linux/fs.h:1868 [inline]
 do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
 do_iter_write+0x185/0x7e0 fs/read_write.c:860
 vfs_iter_write+0x74/0xa0 fs/read_write.c:901
 iter_file_splice_write+0x743/0xc80 fs/splice.c:795
 do_splice_from fs/splice.c:873 [inline]
 do_splice+0xb8c/0x1e50 fs/splice.c:1182
 __do_splice+0x14e/0x270 fs/splice.c:1260
 __do_sys_splice fs/splice.c:1471 [inline]
 __se_sys_splice fs/splice.c:1453 [inline]
 __x64_sys_splice+0x19c/0x250 fs/splice.c:1453
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f15940e4079
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1594096278 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f159416c408 RCX: 00007f15940e4079
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f159416c400 R08: 0000000000000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f159413a040
R13: 00007f1594096290 R14: 00007f1594096400 R15: 0000000000022000
 

Crashes (107):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/05/30 06:14 upstream 8b817fded42d cf184559 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in pipe_write
2023/05/16 04:17 upstream f1fcbaa18b28 71b00cfb .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in pipe_write
2022/12/27 11:34 upstream 1b929c02afd3 9da18ae8 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/09/16 00:47 upstream 3245cb65fd91 dd9a85ff .config strace log report syz C [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/08/18 16:01 upstream 274a2eebf80c d58e263f .config strace log report syz C ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/08/18 15:39 upstream 274a2eebf80c d58e263f .config strace log report syz C ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/08/18 15:07 upstream 274a2eebf80c d58e263f .config strace log report syz C ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/08/18 14:46 upstream 274a2eebf80c d58e263f .config strace log report syz C ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/07/24 16:36 upstream 515f71412bb7 22343af4 .config strace log report syz C ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/07/24 15:56 upstream 515f71412bb7 22343af4 .config strace log report syz C ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/07/24 15:38 upstream 515f71412bb7 22343af4 .config strace log report syz C ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/07/21 02:57 upstream 353f7988dd84 88cb1383 .config strace log report syz C ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/06/11 19:56 upstream fe43c0188911 0d5abf15 .config console log report syz C ci-upstream-kasan-gce possible deadlock in pipe_write
2022/06/07 09:10 upstream e71e60cd74df c8857892 .config strace log report syz C ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/06/07 08:34 upstream e71e60cd74df c8857892 .config strace log report syz C ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/06/07 07:43 upstream e71e60cd74df c8857892 .config strace log report syz C ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/03/17 04:11 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce possible deadlock in pipe_write
2022/03/17 03:52 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce possible deadlock in pipe_write
2022/03/17 03:31 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce possible deadlock in pipe_write
2022/03/17 03:11 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce possible deadlock in pipe_write
2022/03/17 02:45 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/03/17 02:42 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/03/17 02:40 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce possible deadlock in pipe_write
2022/03/17 02:39 upstream 56e337f2cf13 dfa9a8ed .config console log report syz C ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/07/16 20:55 linux-next cb71b93c2dc3 95cb00d1 .config strace log report syz C ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2022/07/16 20:35 linux-next cb71b93c2dc3 95cb00d1 .config strace log report syz C ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2022/07/16 20:14 linux-next cb71b93c2dc3 95cb00d1 .config strace log report syz C ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2022/07/16 20:03 linux-next cb71b93c2dc3 95cb00d1 .config strace log report syz C ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2022/03/17 02:44 linux-next 91265a6da44d dfa9a8ed .config console log report syz C ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2023/05/30 04:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci eb0f1697d729 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/05/21 17:31 upstream 0dd2a6fb1e34 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in pipe_write
2023/05/16 03:47 upstream f1fcbaa18b28 71b00cfb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in pipe_write
2023/04/12 06:29 upstream 2c40519251d6 49faf98d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2023/04/11 14:42 upstream 0d3eb744aed4 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in pipe_write
2023/04/06 06:24 upstream 99ddf2254feb 8b834965 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in pipe_write
2023/02/27 14:15 upstream f3a2439f20d9 e792ae78 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2023/01/24 20:40 upstream 7bf70dbb1882 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2023/01/15 20:27 upstream 5dc4c995db9e a63719e7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2023/01/06 01:48 upstream 41c03ba9beea 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/12/28 10:02 upstream 1b929c02afd3 44712fbc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/12/27 10:47 upstream 1b929c02afd3 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/12/12 04:23 upstream 830b3c68c1fb 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in pipe_write
2022/11/19 02:10 upstream 84368d882b96 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/11/07 03:50 upstream 089d1c31224e 6d752409 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in pipe_write
2022/09/30 00:58 upstream 511cce163b75 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce possible deadlock in pipe_write
2022/09/28 20:46 upstream 49c13ed0316d e2556bc3 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce possible deadlock in pipe_write
2022/09/27 08:18 upstream 3800a713b607 10323ddf .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/09/26 05:14 upstream f76349cf4145 0042f2b4 .config console log report info ci-upstream-kasan-gce possible deadlock in pipe_write
2022/09/19 05:44 upstream 38eddeedbbea dd9a85ff .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root possible deadlock in pipe_write
2022/09/17 21:53 upstream a335366bad13 dd9a85ff .config console log report info ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/08/28 22:05 upstream 10d4879f9ef0 07177916 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in pipe_write
2022/08/19 08:11 upstream 3b06a2755758 26a13b38 .config console log report info ci-upstream-kasan-gce-root possible deadlock in pipe_write
2022/08/11 10:17 upstream 200e340f2196 a6201f11 .config console log report info ci-upstream-kasan-gce possible deadlock in pipe_write
2022/08/09 15:25 upstream 200e340f2196 da700653 .config console log report info ci-upstream-kasan-gce possible deadlock in pipe_write
2022/06/29 13:20 upstream 941e3e791269 496a8536 .config console log report info ci-upstream-kasan-gce possible deadlock in pipe_write
2022/06/26 22:03 upstream 0840a7914caa a371c43c .config console log report info ci-upstream-kasan-gce possible deadlock in pipe_write
2022/03/17 02:28 upstream 56e337f2cf13 dfa9a8ed .config console log report info ci-upstream-kasan-gce possible deadlock in pipe_write
2023/04/25 08:17 upstream 1a0beef98b58 65320f8e .config console log report info ci-qemu-upstream-386 possible deadlock in pipe_write
2022/07/16 03:18 upstream 9b59ec8d50a1 95cb00d1 .config console log report info ci-upstream-kasan-gce-386 possible deadlock in pipe_write
2023/04/25 05:21 linux-next 3b85b9b39960 fdc18293 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2023/04/24 07:37 linux-next d3e1ee0e67e7 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2023/04/23 07:37 linux-next d3e1ee0e67e7 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2022/08/12 16:01 linux-next 6c8f479764eb 402cd70d .config console log report info ci-upstream-linux-next-kasan-gce-root possible deadlock in pipe_write
2023/05/30 18:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci eb0f1697d729 8d5c7541 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/05/23 14:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/04/11 01:57 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9a03cbd79d3a 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/04/08 18:15 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9a03cbd79d3a 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/03/29 15:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59caa87f9dfb f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/03/15 11:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fe15c26ee26e 0d5c4377 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/02/27 16:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 2ebd1fbb946d e792ae78 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/02/06 23:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ca72d58361ee 0a9c11b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/01/19 03:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9598c377d828 42660d9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/01/07 07:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ae87308093bc 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2023/01/04 02:08 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5541c0811a0 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/12/30 08:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5541c0811a0 44712fbc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/12/29 08:14 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5541c0811a0 44712fbc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/12/04 01:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e3cb714fb489 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/11/24 12:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 65762d97e6fa 12c66417 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/11/13 14:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1621b6eaebf7 3ead01ad .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/11/10 07:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1621b6eaebf7 b2488a87 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/10/22 12:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bbed346d5a96 c0b80a55 .config console log report info [disk image] [vmlinux] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/10/21 10:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bbed346d5a96 63e790dd .config console log report info [disk image] [vmlinux] ci-upstream-gce-arm64 possible deadlock in pipe_write
2022/09/17 04:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a6b443748715 dd9a85ff .config console log report info [disk image] [vmlinux] ci-upstream-gce-arm64 possible deadlock in pipe_write
* Struck through repros no longer work on HEAD.