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: 28288 Comm: syz-executor.1 Not tainted 4.14.133 #28
kobject: 'kvm' (ffff888219fbc590): kobject_uevent_env
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88805cd3a100 task.stack: ffff888064ee8000
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:ffff888064eefb98 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888094565340 RCX: ffffffff8424e600
RDX: 0000000000000004 RSI: 0000000000000020 RDI: 0000000000000001
RBP: ffff888064eefbc0 R08: 0000000096a752e1 R09: ffff88805cd3a9c8
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020
R13: 0000000000000001 R14: ffff888094565354 R15: 0000000000000000
FS:  00000000020ad940(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'kvm' (ffff888219fbc590): fill_kobj_path: path = '/devices/virtual/misc/kvm'
CR2: 0000000000738000 CR3: 00000000a51b1000 CR4: 00000000001426f0
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
 __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
 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
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x413501
RSP: 002b:00007ffc051b4dc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413501
RDX: 0000001b2c420000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf
R10: 00007ffc051b4ea0 R11: 0000000000000293 R12: 000000000075bf20
R13: 00000000000880af R14: 0000000000761c40 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 
RIP: __read_once_size /./include/linux/compiler.h:183 [inline] RSP: ffff888064eefb98
RIP: atomic_read /./arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff888064eefb98
RIP: refcount_sub_and_test+0x2b/0xf0 /lib/refcount.c:179 RSP: ffff888064eefb98
kobject: 'loop4' (ffff8880a4a786e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a786e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a4abc960): kobject_uevent_env
kobject: 'loop5' (ffff8880a4abc960): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'kvm' (ffff888219fbc590): kobject_uevent_env
---[ end trace 7461d01bd1f14dd5 ]---
kobject: 'kvm' (ffff888219fbc590): fill_kobj_path: path = '/devices/virtual/misc/kvm'