possible deadlock in pipe

possible deadlock in pipe_lock
Status: fixed on 2019/11/29 10:34
Reported-by: syzbot+8aec72b2d58c389b4741@syzkaller.appspotmail.com
Fix commit: f1c5aa5eda08 ovl: detect overlapping layers
First crash: 878d, last: 874d

Fix bisection: fixed by (bisect log) :
commit f1c5aa5eda08710c2ba619d93126380881fa1114
Author: Amir Goldstein <amir73il@gmail.com>
Date: Thu Apr 18 14:42:08 2019 +0000

ovl: detect overlapping layers
similar bugs (8):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	possible deadlock in pipe_lock				50806	1370d	1418d	0/22	closed as invalid on 2018/02/14 14:20
upstream	possible deadlock in pipe_lock (4)				1	137d	133d	0/22	auto-closed as invalid on 2021/07/03 13:02
upstream	possible deadlock in pipe_lock (2)				3	881d	951d	0/22	auto-closed as invalid on 2019/10/18 15:02
linux-4.19	possible deadlock in pipe_lock (2)	C			9	21d	632d	0/1	upstream: reported C repro on 2019/12/26 07:17
upstream	possible deadlock in pipe_lock (5)	C	done		5	56d	56d	17/22	upstream: reported C repro on 2021/07/24 19:07
android-49	possible deadlock in pipe_lock				5	695d	888d	0/3	auto-closed as invalid on 2020/02/21 12:40
android-44	possible deadlock in pipe_lock	C			82	655d	888d	0/2	public: reported C repro on 2019/04/14 08:51
upstream	possible deadlock in pipe_lock (3)	C	inconclusive	done	4	595d	632d	17/22	fixed on 2020/08/18 22:40
Sample crash report:
audit: type=1400 audit(1556151269.008:37): avc:  denied  { associate } for  pid=7798 comm="syz-executor372" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
======================================================
WARNING: possible circular locking dependency detected
4.19.36 #4 Not tainted
------------------------------------------------------
syz-executor372/7809 is trying to acquire lock:
000000005bdde473 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline]
000000005bdde473 (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70

but task is already holding lock:
00000000928c029c (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2764 [inline]
00000000928c029c (sb_writers#6){.+.+}, at: do_splice+0xcf4/0x1260 fs/splice.c:1147
overlayfs: workdir and upperdir must reside under the same mount

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (sb_writers#6){.+.+}:
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       __sb_start_write+0x20b/0x360 fs/super.c:1387
       sb_start_write include/linux/fs.h:1569 [inline]
       mnt_want_write+0x3f/0xc0 fs/namespace.c:360
       ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24
       ovl_do_remove+0xf8/0xd90 fs/overlayfs/dir.c:843
       ovl_rmdir+0x1b/0x20 fs/overlayfs/dir.c:893
       vfs_rmdir fs/namei.c:3879 [inline]
       vfs_rmdir+0x19c/0x470 fs/namei.c:3858
       do_rmdir+0x39e/0x420 fs/namei.c:3940
       __do_sys_rmdir fs/namei.c:3958 [inline]
       __se_sys_rmdir fs/namei.c:3956 [inline]
       __x64_sys_rmdir+0x36/0x40 fs/namei.c:3956
       do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #3 (&ovl_i_mutex_dir_key[depth]#2){++++}:
       down_read+0x3b/0xb0 kernel/locking/rwsem.c:24
       inode_lock_shared include/linux/fs.h:748 [inline]
       do_last fs/namei.c:3323 [inline]
       path_openat+0x1e79/0x4690 fs/namei.c:3534
       do_filp_open+0x1a1/0x280 fs/namei.c:3564
       do_open_execat+0x140/0x660 fs/exec.c:853
       __do_execve_file.isra.0+0x15a4/0x2150 fs/exec.c:1755
       do_execveat_common fs/exec.c:1866 [inline]
       do_execve fs/exec.c:1883 [inline]
       __do_sys_execve fs/exec.c:1964 [inline]
       __se_sys_execve fs/exec.c:1959 [inline]
       __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
       do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #2 (&sig->cred_guard_mutex){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
       mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102
       do_io_accounting+0x1f4/0x830 fs/proc/base.c:2699
       proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2748
       proc_single_show+0xf6/0x180 fs/proc/base.c:737
       seq_read+0x4db/0x1130 fs/seq_file.c:229
       do_loop_readv_writev fs/read_write.c:700 [inline]
       do_loop_readv_writev fs/read_write.c:687 [inline]
       do_iter_read+0x495/0x650 fs/read_write.c:924
       vfs_readv+0xf0/0x160 fs/read_write.c:986
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x478/0x890 fs/splice.c:417
       do_splice_to+0x12a/0x190 fs/splice.c:881
       splice_direct_to_actor+0x256/0x890 fs/splice.c:953
       do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
       do_sendfile+0x597/0xce0 fs/read_write.c:1446
       __do_sys_sendfile64 fs/read_write.c:1507 [inline]
       __se_sys_sendfile64 fs/read_write.c:1493 [inline]
       __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1493
       do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (&p->lock){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
       seq_read+0x71/0x1130 fs/seq_file.c:161
       proc_reg_read+0x1fa/0x2c0 fs/proc/inode.c:231
       do_loop_readv_writev fs/read_write.c:700 [inline]
       do_loop_readv_writev fs/read_write.c:687 [inline]
       do_iter_read+0x495/0x650 fs/read_write.c:924
       vfs_readv+0xf0/0x160 fs/read_write.c:986
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x478/0x890 fs/splice.c:417
       do_splice_to+0x12a/0x190 fs/splice.c:881
       do_splice+0xf85/0x1260 fs/splice.c:1174
       __do_sys_splice fs/splice.c:1415 [inline]
       __se_sys_splice fs/splice.c:1395 [inline]
       __x64_sys_splice+0x2c6/0x330 fs/splice.c:1395
       do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&pipe->mutex/1){+.+.}:
       lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
       __mutex_lock_common kernel/locking/mutex.c:925 [inline]
       __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
       pipe_lock_nested fs/pipe.c:62 [inline]
       pipe_lock+0x6e/0x80 fs/pipe.c:70
       iter_file_splice_write+0x18b/0xbe0 fs/splice.c:700
       do_splice_from fs/splice.c:852 [inline]
       do_splice+0x644/0x1260 fs/splice.c:1148
       __do_sys_splice fs/splice.c:1415 [inline]
       __se_sys_splice fs/splice.c:1395 [inline]
       __x64_sys_splice+0x2c6/0x330 fs/splice.c:1395
       do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  &pipe->mutex/1 --> &ovl_i_mutex_dir_key[depth]#2 --> sb_writers#6

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_writers#6);
                               lock(&ovl_i_mutex_dir_key[depth]#2);
                               lock(sb_writers#6);
  lock(&pipe->mutex/1);

 *** DEADLOCK ***

1 lock held by syz-executor372/7809:
 #0: 00000000928c029c (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2764 [inline]
 #0: 00000000928c029c (sb_writers#6){.+.+}, at: do_splice+0xcf4/0x1260 fs/splice.c:1147

stack backtrace:
CPU: 1 PID: 7809 Comm: syz-executor372 Not tainted 4.19.36 #4
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+0x172/0x1f0 lib/dump_stack.c:113
 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221
 check_prev_add kernel/locking/lockdep.c:1861 [inline]
 check_prevs_add kernel/locking/lockdep.c:1974 [inline]
 validate_chain kernel/locking/lockdep.c:2415 [inline]
 __lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411
 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
 __mutex_lock_common kernel/locking/mutex.c:925 [inline]
 __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 pipe_lock_nested fs/pipe.c:62 [inline]
 pipe_lock+0x6e/0x80 fs/pipe.c:70
 iter_file_splice_write+0x18b/0xbe0 fs/splice.c:700
 do_splice_from fs/splice.c:852 [inline]
 do_splice+0x644/0x1260 fs/splice.c:1148
 __do_sys_splice fs/splice.c:1415 [inline]
 __se_sys_splice fs/splice.c:1395 [inline]
 __x64_sys_splice+0x2c6/0x330 fs/splice.c:1395
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4475b9
Code: e8 4c bb 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc6e1ebcda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00000000006ddc78 RCX: 00000000004475b9
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006ddc70 R08: 0000000000000020 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc7c
R13: 00007ffff2b2160f R14: 00007fc6e1ebd9c0 R15: 0000000000000001
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
overlayfs: workdir and upperdir must reside under the same mount
Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci2-linux-4-19	2019/04/25 00:18	linux-4.19.y	c98875d930e9	8e3c52b1	.config	log	report	syz	C
ci2-linux-4-19	2019/04/28 07:06	linux-4.19.y	19bb613acb9a	b617407b	.config	log	report