syzbot


possible deadlock in walk_component

Status: upstream: reported syz repro on 2020/07/06 08:23
Reported-by: syzbot+accdedfdaea55738ab96@syzkaller.appspotmail.com
First crash: 1361d, last: 493d
Fix bisection: failed (error log, bisect log)
  
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in walk_component fs 11 1274d 1488d 0/26 auto-closed as invalid on 2021/01/29 13:43
upstream possible deadlock in walk_component (2) kernfs 2 216d 253d 0/26 auto-obsoleted due to no activity on 2023/12/03 10:44

Sample crash report:
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
======================================================
WARNING: possible circular locking dependency detected
4.19.197-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/14753 is trying to acquire lock:
overlayfs: './bus' not a directory
00000000e101582f (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
00000000e101582f (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline]
00000000e101582f (&ovl_i_mutex_dir_key[depth]){++++}, at: walk_component+0x798/0xda0 fs/namei.c:1811

but task is already holding lock:
000000007288cee2 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline]
000000007288cee2 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&sig->cred_guard_mutex){+.+.}:
       lock_trace fs/proc/base.c:402 [inline]
       proc_pid_stack+0x160/0x350 fs/proc/base.c:452
       proc_single_show+0xeb/0x170 fs/proc/base.c:755
       seq_read+0x4be/0x1160 fs/seq_file.c:229
       do_loop_readv_writev fs/read_write.c:701 [inline]
       do_loop_readv_writev fs/read_write.c:688 [inline]
       do_iter_read+0x471/0x630 fs/read_write.c:925
       vfs_readv+0xe5/0x150 fs/read_write.c:987
       do_preadv fs/read_write.c:1071 [inline]
       __do_sys_preadv fs/read_write.c:1121 [inline]
       __se_sys_preadv fs/read_write.c:1116 [inline]
       __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #2 (&p->lock){+.+.}:
       seq_read+0x6b/0x1160 fs/seq_file.c:161
       proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231
       do_loop_readv_writev fs/read_write.c:701 [inline]
       do_loop_readv_writev fs/read_write.c:688 [inline]
       do_iter_read+0x471/0x630 fs/read_write.c:925
       vfs_readv+0xe5/0x150 fs/read_write.c:987
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x457/0xa00 fs/splice.c:417
       do_splice_to+0x10e/0x160 fs/splice.c:881
       splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
       do_splice_direct+0x1a7/0x270 fs/splice.c:1068
       do_sendfile+0x550/0xc30 fs/read_write.c:1447
       __do_sys_sendfile64 fs/read_write.c:1508 [inline]
       __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (sb_writers#3){.+.+}:
       sb_start_write include/linux/fs.h:1579 [inline]
       mnt_want_write+0x3a/0xb0 fs/namespace.c:360
       ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:600
       lookup_open+0x893/0x1a20 fs/namei.c:3235
       do_last fs/namei.c:3327 [inline]
       path_openat+0x1094/0x2df0 fs/namei.c:3537
       do_filp_open+0x18c/0x3f0 fs/namei.c:3567
       do_sys_open+0x3b3/0x520 fs/open.c:1085
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&ovl_i_mutex_dir_key[depth]){++++}:
       down_read+0x36/0x80 kernel/locking/rwsem.c:24
       inode_lock_shared include/linux/fs.h:758 [inline]
       lookup_slow fs/namei.c:1688 [inline]
       walk_component+0x798/0xda0 fs/namei.c:1811
       link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142
       link_path_walk fs/namei.c:2073 [inline]
       path_openat+0x1db/0x2df0 fs/namei.c:3536
       do_filp_open+0x18c/0x3f0 fs/namei.c:3567
       do_open_execat+0x11d/0x5b0 fs/exec.c:853
       __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
       do_execveat_common fs/exec.c:1879 [inline]
       do_execve+0x35/0x50 fs/exec.c:1896
       __do_sys_execve fs/exec.c:1977 [inline]
       __se_sys_execve fs/exec.c:1972 [inline]
       __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  &ovl_i_mutex_dir_key[depth] --> &p->lock --> &sig->cred_guard_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sig->cred_guard_mutex);
                               lock(&p->lock);
                               lock(&sig->cred_guard_mutex);
  lock(&ovl_i_mutex_dir_key[depth]);

 *** DEADLOCK ***

1 lock held by syz-executor.2/14753:
 #0: 000000007288cee2 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline]
 #0: 000000007288cee2 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762

stack backtrace:
CPU: 0 PID: 14753 Comm: syz-executor.2 Not tainted 4.19.197-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+0x1fc/0x2ef lib/dump_stack.c:118
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222
 check_prev_add kernel/locking/lockdep.c:1866 [inline]
 check_prevs_add kernel/locking/lockdep.c:1979 [inline]
 validate_chain kernel/locking/lockdep.c:2420 [inline]
 __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 down_read+0x36/0x80 kernel/locking/rwsem.c:24
 inode_lock_shared include/linux/fs.h:758 [inline]
 lookup_slow fs/namei.c:1688 [inline]
 walk_component+0x798/0xda0 fs/namei.c:1811
 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142
 link_path_walk fs/namei.c:2073 [inline]
 path_openat+0x1db/0x2df0 fs/namei.c:3536
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_open_execat+0x11d/0x5b0 fs/exec.c:853
 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
 do_execveat_common fs/exec.c:1879 [inline]
 do_execve+0x35/0x50 fs/exec.c:1896
 __do_sys_execve fs/exec.c:1977 [inline]
 __se_sys_execve fs/exec.c:1972 [inline]
 __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4e4858d188 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000020000f40 RSI: 0000000020000d80 RDI: 0000000020000780
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffce1049c1f R14: 00007f4e4858d300 R15: 0000000000022000
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
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overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory
overlayfs: './bus' not a directory

Crashes (126):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/07/18 05:31 linux-4.19.y fcfbdfe9626e f115ae98 .config console log report syz ci2-linux-4-19 possible deadlock in walk_component
2022/11/21 14:36 linux-4.19.y 3f8a27f9e27b 5bb70014 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 possible deadlock in walk_component
2022/09/01 21:48 linux-4.19.y 3f8a27f9e27b 86c46e46 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 possible deadlock in walk_component
2022/08/28 15:47 linux-4.19.y 3f8a27f9e27b 07177916 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/08/25 10:29 linux-4.19.y 3f8a27f9e27b 514514f6 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/08/20 12:12 linux-4.19.y 3f8a27f9e27b 26a13b38 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/08/19 13:08 linux-4.19.y 3f8a27f9e27b 26a13b38 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/08/06 22:47 linux-4.19.y 3f8a27f9e27b 88e3a122 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/08/01 09:33 linux-4.19.y 3f8a27f9e27b fef302b1 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/07/30 08:00 linux-4.19.y 3f8a27f9e27b fef302b1 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/07/14 17:57 linux-4.19.y 3f8a27f9e27b 5d921b08 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/07/06 19:07 linux-4.19.y 3f8a27f9e27b bff65f44 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/07/06 07:54 linux-4.19.y 3f8a27f9e27b bff65f44 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/06/27 05:29 linux-4.19.y 3f8a27f9e27b a371c43c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/06/26 09:24 linux-4.19.y 3f8a27f9e27b a371c43c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/06/16 10:57 linux-4.19.y 3f8a27f9e27b 1719ee24 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/06/14 10:44 linux-4.19.y 3f8a27f9e27b 0f087040 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/06/03 17:56 linux-4.19.y 3f8a27f9e27b eee80d3c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/05/10 16:32 linux-4.19.y 3f8a27f9e27b 8b277b8e .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/24 02:55 linux-4.19.y 3f8a27f9e27b 5ff41e94 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/22 12:22 linux-4.19.y 3f8a27f9e27b e2d91b1d .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/20 14:27 linux-4.19.y 3f8a27f9e27b e2d91b1d .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/19 20:34 linux-4.19.y 3f8a27f9e27b e2d91b1d .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/09 15:28 linux-4.19.y 3f8a27f9e27b 9e8eaa75 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/08 07:57 linux-4.19.y 3f8a27f9e27b 7bdd8b2c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/06 16:41 linux-4.19.y 3f8a27f9e27b 7bdd8b2c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/06 00:09 linux-4.19.y 3f8a27f9e27b 7bdd8b2c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/03/04 14:31 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/27 17:41 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/14 01:51 linux-4.19.y 3f8a27f9e27b 8b9ca619 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/13 18:22 linux-4.19.y 3f8a27f9e27b 8b9ca619 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/12 18:01 linux-4.19.y 3f8a27f9e27b 8b9ca619 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/05 15:41 linux-4.19.y 3f8a27f9e27b a7dab638 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/02 17:38 linux-4.19.y 3f8a27f9e27b 4ebb2798 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/02/01 14:17 linux-4.19.y 3f8a27f9e27b c1c1631d .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/21 20:07 linux-4.19.y 3f8a27f9e27b 214351e1 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/18 08:54 linux-4.19.y 3f8a27f9e27b 731a2d23 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/17 00:54 linux-4.19.y 3f8a27f9e27b 723cfaf0 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/15 16:52 linux-4.19.y 3f8a27f9e27b 723cfaf0 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/15 11:48 linux-4.19.y 3f8a27f9e27b 723cfaf0 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/01 14:10 linux-4.19.y 3f8a27f9e27b e1768e9c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2022/01/01 01:58 linux-4.19.y 3f8a27f9e27b 36bd2e48 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/12/06 04:08 linux-4.19.y 3f8a27f9e27b a617004c .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/11/14 16:46 linux-4.19.y 3f8a27f9e27b 75b04091 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/10/29 08:33 linux-4.19.y 3f8a27f9e27b 2353a3ec .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/10/29 07:25 linux-4.19.y 3f8a27f9e27b be531bb4 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/10/28 02:38 linux-4.19.y 3f8a27f9e27b be531bb4 .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/10/24 21:03 linux-4.19.y 3f8a27f9e27b 282f03fb .config console log report info ci2-linux-4-19 possible deadlock in walk_component
2021/01/04 19:27 linux-4.19.y 3207316b3bee 79264ae3 .config console log report info ci2-linux-4-19
2020/07/06 08:22 linux-4.19.y 399849e4654e ac5a135b .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.