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possible deadlock in ovl_write_iter

Status: fixed on 2019/12/19 13:28
Reported-by: syzbot+baff7daddde4737f68b5@syzkaller.appspotmail.com
Fix commit: ab69a2304210 Revert "tipc: fix modprobe tipc failed after switch order of device registration"
First crash: 2044d, last: 1834d
Fix bisection: fixed by (bisect log) :
commit ab69a230421065b48ef93d3e6daf332e71c931dc
Author: David S. Miller <davem@davemloft.net>
Date: Fri May 17 19:15:05 2019 +0000

  Revert "tipc: fix modprobe tipc failed after switch order of device registration"

  
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in ovl_write_iter overlayfs C 222 2024d 2247d 0/28 closed as dup on 2019/02/12 15:47
linux-4.19 possible deadlock in ovl_write_iter (3) C error 132 625d 1558d 0/1 upstream: reported C repro on 2020/08/16 01:29
linux-4.19 possible deadlock in ovl_write_iter (2) syz done 2 1718d 1718d 1/1 fixed on 2020/04/09 01:05

Sample crash report:
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
======================================================
Process accounting resumed
WARNING: possible circular locking dependency detected
4.19.37 #5 Not tainted
------------------------------------------------------
syz-executor.4/16409 is trying to acquire lock:
000000004457f15c (sb_writers#4){.+.+}, at: file_start_write include/linux/fs.h:2764 [inline]
000000004457f15c (sb_writers#4){.+.+}, at: ovl_write_iter+0x91b/0xc20 fs/overlayfs/file.c:243

but task is already holding lock:
overlayfs: './file0' not a directory
00000000f23e5990 (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:738 [inline]
00000000f23e5990 (&ovl_i_mutex_key[depth]){+.+.}, at: ovl_write_iter+0x148/0xc20 fs/overlayfs/file.c:231

which lock already depends on the new lock.

overlayfs: './file0' not a directory

the existing dependency chain (in reverse order) is:

-> #2 (&ovl_i_mutex_key[depth]){+.+.}:
       down_write+0x38/0x90 kernel/locking/rwsem.c:70
       inode_lock include/linux/fs.h:738 [inline]
       ovl_write_iter+0x148/0xc20 fs/overlayfs/file.c:231
Process accounting resumed
       call_write_iter include/linux/fs.h:1811 [inline]
       new_sync_write fs/read_write.c:474 [inline]
       __vfs_write+0x58e/0x820 fs/read_write.c:487
       __kernel_write+0x110/0x390 fs/read_write.c:506
Process accounting resumed
       do_acct_process+0xd37/0x1150 kernel/acct.c:520
       slow_acct_process kernel/acct.c:579 [inline]
       acct_process+0x568/0x61e kernel/acct.c:605
Process accounting resumed
       do_exit+0x17c0/0x2fa0 kernel/exit.c:866
       do_group_exit+0x135/0x370 kernel/exit.c:979
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
       get_signal+0x399/0x1d50 kernel/signal.c:2572
Process accounting resumed
       do_signal+0x95/0x1950 arch/x86/kernel/signal.c:816
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
       exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
overlayfs: './file0' not a directory
       prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
       do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (
Process accounting resumed
&acct->lock#2){+.+.}:
       __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
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
       acct_pin_kill+0x27/0x100 kernel/acct.c:173
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
       pin_kill+0x18f/0x860 fs/fs_pin.c:50
       acct_on+0x574/0x790 kernel/acct.c:254
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
       __do_sys_acct kernel/acct.c:286 [inline]
       __se_sys_acct kernel/acct.c:273 [inline]
       __x64_sys_acct+0xae/0x200 kernel/acct.c:273
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
       do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (sb_writers#4){.+.+}:
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
       lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900
       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
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
       file_start_write include/linux/fs.h:2764 [inline]
       ovl_write_iter+0x91b/0xc20 fs/overlayfs/file.c:243
       call_write_iter include/linux/fs.h:1811 [inline]
       new_sync_write fs/read_write.c:474 [inline]
       __vfs_write+0x58e/0x820 fs/read_write.c:487
       __kernel_write+0x110/0x390 fs/read_write.c:506
       do_acct_process+0xd37/0x1150 kernel/acct.c:520
       slow_acct_process kernel/acct.c:579 [inline]
       acct_process+0x568/0x61e kernel/acct.c:605
       do_exit+0x17c0/0x2fa0 kernel/exit.c:866
       do_group_exit+0x135/0x370 kernel/exit.c:979
       get_signal+0x399/0x1d50 kernel/signal.c:2572
       do_signal+0x95/0x1950 arch/x86/kernel/signal.c:816
       exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
       prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
       do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  sb_writers#4 --> &acct->lock#2 --> &ovl_i_mutex_key[depth]

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ovl_i_mutex_key[depth]);
                               lock(&acct->lock#2);
                               lock(&ovl_i_mutex_key[depth]);
  lock(sb_writers#4);

 *** DEADLOCK ***

3 locks held by syz-executor.4/16409:
 #0: 00000000ca3023ab (&acct->lock#2){+.+.}, at: acct_get kernel/acct.c:161 [inline]
 #0: 00000000ca3023ab (&acct->lock#2){+.+.}, at: slow_acct_process kernel/acct.c:577 [inline]
 #0: 00000000ca3023ab (&acct->lock#2){+.+.}, at: acct_process+0x2e5/0x61e kernel/acct.c:605
 #1: 00000000ed439905 (sb_writers#13){.+.+}, at: file_start_write_trylock include/linux/fs.h:2771 [inline]
 #1: 00000000ed439905 (sb_writers#13){.+.+}, at: do_acct_process+0xf37/0x1150 kernel/acct.c:517
 #2: 00000000f23e5990 (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:738 [inline]
 #2: 00000000f23e5990 (&ovl_i_mutex_key[depth]){+.+.}, at: ovl_write_iter+0x148/0xc20 fs/overlayfs/file.c:231

stack backtrace:
CPU: 1 PID: 16409 Comm: syz-executor.4 Not tainted 4.19.37 #5
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:3900
 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
 file_start_write include/linux/fs.h:2764 [inline]
 ovl_write_iter+0x91b/0xc20 fs/overlayfs/file.c:243
 call_write_iter include/linux/fs.h:1811 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x58e/0x820 fs/read_write.c:487
 __kernel_write+0x110/0x390 fs/read_write.c:506
 do_acct_process+0xd37/0x1150 kernel/acct.c:520
 slow_acct_process kernel/acct.c:579 [inline]
 acct_process+0x568/0x61e kernel/acct.c:605
 do_exit+0x17c0/0x2fa0 kernel/exit.c:866
 do_group_exit+0x135/0x370 kernel/exit.c:979
 get_signal+0x399/0x1d50 kernel/signal.c:2572
 do_signal+0x95/0x1950 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe499550cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000073bfa8 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000073bfa8
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000073bfac
R13: 00007ffc240ff03f R14: 00007fe4995519c0 R15: 000000000073bfac
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
Process accounting resumed
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
Process accounting resumed
kobject: 'loop4' (000000001b7420bb): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop4' (000000001b7420bb): fill_kobj_path: path = '/devices/virtual/block/loop4'
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop3' (00000000880352cf): kobject_uevent_env
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop3' (00000000880352cf): fill_kobj_path: path = '/devices/virtual/block/loop3'
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
overlayfs: './file0' not a directory
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
Process accounting resumed
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop4' (000000001b7420bb): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop4' (000000001b7420bb): fill_kobj_path: path = '/devices/virtual/block/loop4'
Process accounting resumed
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop3' (00000000880352cf): kobject_uevent_env
kauditd_printk_skb: 141 callbacks suppressed
audit: type=1804 audit(1556521050.622:2599): pid=16527 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir175988685/syzkaller.Xbr9Za/431/file0" dev="sda1" ino=16643 res=1
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop3' (00000000880352cf): fill_kobj_path: path = '/devices/virtual/block/loop3'
Process accounting resumed
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
audit: type=1804 audit(1556521050.692:2600): pid=16532 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir733048634/syzkaller.yUAzpd/447/file0" dev="sda1" ino=16721 res=1
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
audit: type=1804 audit(1556521050.712:2601): pid=16529 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir232567175/syzkaller.oMOuQ8/437/file0" dev="sda1" ino=16581 res=1
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
audit: type=1804 audit(1556521050.752:2602): pid=16535 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir378415304/syzkaller.fBZ0Da/425/file0" dev="sda1" ino=16533 res=1
Process accounting resumed
Process accounting resumed
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
overlayfs: './file0' not a directory
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
Process accounting resumed
overlayfs: './file0' not a directory
audit: type=1804 audit(1556521050.762:2603): pid=16539 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir637840038/syzkaller.2RGt19/422/file0" dev="sda1" ino=16626 res=1
Process accounting resumed
audit: type=1804 audit(1556521050.762:2604): pid=16537 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir733048634/syzkaller.yUAzpd/448/file0" dev="sda1" ino=16577 res=1
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
Process accounting resumed
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
audit: type=1804 audit(1556521050.792:2605): pid=16541 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir175988685/syzkaller.Xbr9Za/432/file0" dev="sda1" ino=16642 res=1
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
kobject: 'loop3' (00000000880352cf): kobject_uevent_env
Process accounting resumed
kobject: 'loop3' (00000000880352cf): fill_kobj_path: path = '/devices/virtual/block/loop3'
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
audit: type=1804 audit(1556521050.792:2606): pid=16543 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir726457169/syzkaller.rKu2xf/431/file0" dev="sda1" ino=16643 res=1
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
Process accounting resumed
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
audit: type=1804 audit(1556521050.812:2607): pid=16545 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir733048634/syzkaller.yUAzpd/449/file0" dev="sda1" ino=16546 res=1
Process accounting resumed
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
Process accounting resumed
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
audit: type=1804 audit(1556521050.852:2608): pid=16549 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir232567175/syzkaller.oMOuQ8/438/file0" dev="sda1" ino=16690 res=1
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop3' (00000000880352cf): kobject_uevent_env
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop3' (00000000880352cf): fill_kobj_path: path = '/devices/virtual/block/loop3'
overlayfs: './file0' not a directory
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
Process accounting resumed
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop4' (000000001b7420bb): kobject_uevent_env
Process accounting resumed
kobject: 'loop4' (000000001b7420bb): fill_kobj_path: path = '/devices/virtual/block/loop4'
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
Process accounting resumed
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop0' (0000000073a10532): fill_kobj_path: path = '/devices/virtual/block/loop0'
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop1' (000000004fd93cd8): kobject_uevent_env
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
kobject: 'loop1' (000000004fd93cd8): fill_kobj_path: path = '/devices/virtual/block/loop1'
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
kobject: 'loop4' (000000001b7420bb): kobject_uevent_env
Process accounting resumed
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
Process accounting resumed
overlayfs: './file0' not a directory
kobject: 'loop4' (000000001b7420bb): fill_kobj_path: path = '/devices/virtual/block/loop4'
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
overlayfs: './file0' not a directory
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
kobject: 'loop2' (000000000dfd4aa7): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop2' (000000000dfd4aa7): fill_kobj_path: path = '/devices/virtual/block/loop2'
Process accounting resumed
kobject: 'loop5' (00000000d2a29a43): kobject_uevent_env
kobject: 'loop5' (00000000d2a29a43): fill_kobj_path: path = '/devices/virtual/block/loop5'
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): kobject_uevent_env
overlayfs: './file0' not a directory
kobject: 'loop0' (0000000073a10532): fill_k

Crashes (84):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/04/29 07:05 linux-4.19.y 19bb613acb9a b617407b .config console log report syz ci2-linux-4-19
2019/11/13 16:38 linux-4.19.y 7d8dbefc22ff 048f2d49 .config console log report ci2-linux-4-19
2019/05/17 09:41 linux-4.19.y dafc674bbcb1 2755003a .config console log report ci2-linux-4-19
2019/05/15 07:04 linux-4.19.y 3351e9d39947 bd4e3ac7 .config console log report ci2-linux-4-19
2019/05/06 17:16 linux-4.19.y 1656b1457209 148296f4 .config console log report ci2-linux-4-19
2019/05/01 17:53 linux-4.19.y 19bb613acb9a 7516d9fa .config console log report ci2-linux-4-19
2019/04/30 18:19 linux-4.19.y 19bb613acb9a 618456b4 .config console log report ci2-linux-4-19
2019/04/30 06:10 linux-4.19.y 19bb613acb9a 20f16bef .config console log report ci2-linux-4-19
2019/04/30 03:23 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/30 00:08 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 23:04 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 20:30 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 12:16 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 08:30 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 05:05 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 01:46 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/29 00:43 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 21:14 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 19:53 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 18:52 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 15:48 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 14:34 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 13:26 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 12:00 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 10:23 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 08:49 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 07:47 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 06:49 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 06:42 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 06:27 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 05:01 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 04:57 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 03:21 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/28 00:21 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/27 08:58 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/27 08:26 linux-4.19.y 19bb613acb9a b617407b .config console log report ci2-linux-4-19
2019/04/27 05:26 linux-4.19.y c98875d930e9 b617407b .config console log report ci2-linux-4-19
2019/04/27 02:21 linux-4.19.y c98875d930e9 b617407b .config console log report ci2-linux-4-19
2019/04/26 09:45 linux-4.19.y c98875d930e9 b617407b .config console log report ci2-linux-4-19
2019/04/25 15:03 linux-4.19.y c98875d930e9 f46aabc8 .config console log report ci2-linux-4-19
2019/04/24 18:06 linux-4.19.y c98875d930e9 8e3c52b1 .config console log report ci2-linux-4-19
2019/04/24 09:35 linux-4.19.y c98875d930e9 8e3c52b1 .config console log report ci2-linux-4-19
2019/04/24 06:53 linux-4.19.y c98875d930e9 2398edea .config console log report ci2-linux-4-19
2019/04/23 14:45 linux-4.19.y c98875d930e9 2398edea .config console log report ci2-linux-4-19
2019/04/23 14:31 linux-4.19.y c98875d930e9 2398edea .config console log report ci2-linux-4-19
2019/04/18 12:52 linux-4.19.y 4b0e041c9dad b0e8efcb .config console log report ci2-linux-4-19
2019/04/18 02:08 linux-4.19.y 4b0e041c9dad b0e8efcb .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.