gfs2: not a GFS2 filesystem
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7790 Comm: syz-executor.2 Not tainted 4.14.133 #28
kobject: 'loop5' (ffff8880a4b333a0): kobject_uevent_env
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88808f56e280 task.stack: ffff88808a500000
RIP: 0010:__read_once_size /./include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read /./arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:refcount_sub_and_test+0x2b/0xf0 /lib/refcount.c:179
RSP: 0018:ffff88808a507b98 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809c03e500 RCX: ffffffff8424e600
RDX: 0000000000000004 RSI: 0000000000000020 RDI: 0000000000000001
RBP: ffff88808a507bc0 R08: 0000000096a752e1 R09: ffff88808f56eb48
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020
R13: 0000000000000001 R14: ffff88809c03e514 R15: 0000000000000000
FS:  0000000001da8940(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6e2830e00 CR3: 000000009de39000 CR4: 00000000001406f0
Call Trace:
 refcount_dec_and_test+0x1b/0x20 /lib/refcount.c:212
 vb2_vmalloc_put+0x18/0x70 /drivers/media/v4l2-core/videobuf2-vmalloc.c:68
 __vb2_buf_mem_free+0x103/0x1e0 /drivers/media/v4l2-core/videobuf2-core.c:240
kobject: 'loop5' (ffff8880a4b333a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
 __vb2_free_mem /drivers/media/v4l2-core/videobuf2-core.c:409 [inline]
 __vb2_queue_free+0x634/0x7d0 /drivers/media/v4l2-core/videobuf2-core.c:454
TCP: request_sock_TCPv6: Possible SYN flooding on port 20000. Sending cookies.  Check SNMP counters.
 vb2_core_queue_release+0x64/0x80 /drivers/media/v4l2-core/videobuf2-core.c:2043
 vb2_queue_release /drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline]
 _vb2_fop_release+0x1cf/0x2a0 /drivers/media/v4l2-core/videobuf2-v4l2.c:840
 vb2_fop_release+0x75/0xc0 /drivers/media/v4l2-core/videobuf2-v4l2.c:854
 vivid_fop_release+0x180/0x3f0 /drivers/media/platform/vivid/vivid-core.c:486
 v4l2_release+0xf9/0x190 /drivers/media/v4l2-core/v4l2-dev.c:446
 __fput+0x275/0x7a0 /fs/file_table.c:210
 ____fput+0x16/0x20 /fs/file_table.c:244
 task_work_run+0x114/0x190 /kernel/task_work.c:113
 tracehook_notify_resume /./include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 /arch/x86/entry/common.c:164
 prepare_exit_to_usermode /arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath /arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 /arch/x86/entry/common.c:297
kobject: 'loop5' (ffff8880a4b333a0): kobject_uevent_env
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x413501
RSP: 002b:00007ffc3089d2e0 EFLAGS: 00000293
kobject: 'loop5' (ffff8880a4b333a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413501
RDX: 0000001b32120000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf
R10: 00007ffc3089d3c0 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000028bb9 R14: 00000000007608e0 R15: ffffffffffffffff
Code: 55 48 89 e5 41 56 41 55 41 89 fd 41 54 49 89 f4 53 48 83 ec 08 e8 66 b1 85 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 
kobject: 'loop5' (ffff8880a4b333a0): kobject_uevent_env
RIP: __read_once_size /./include/linux/compiler.h:183 [inline] RSP: ffff88808a507b98
RIP: atomic_read /./arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff88808a507b98
RIP: refcount_sub_and_test+0x2b/0xf0 /lib/refcount.c:179 RSP: ffff88808a507b98
syz-executor.1 (7808) used greatest stack depth: 23880 bytes left
kobject: 'loop4' (ffff8880a4af8aa0): kobject_uevent_env
---[ end trace 8a5438bcce5e7f47 ]---
kobject: 'loop5' (ffff8880a4b333a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a4af8aa0): fill_kobj_path: path = '/devices/virtual/block/loop4'