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: 10969 Comm: systemd-udevd Not tainted 4.14.288-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
task: ffff88809ba7e000 task.stack: ffff88809f5b0000
RIP: 0010:kobject_uevent_env+0xb2/0xf30 lib/kobject_uevent.c:356
RSP: 0018:ffff88809f5b7c00 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff1101374fd20
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0
RBP: ffff88808f484b90 R08: ffffffff8b9ba560 R09: 0000000000000003
R10: 0000000000000000 R11: ffff88809ba7e000 R12: 00000000000000a0
R13: dffffc0000000000 R14: ffff88808f484a88 R15: 00000000000000a0
FS:  00007f1cdd1df8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94bf0fe028 CR3: 000000009955b000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_clr_fd+0x59f/0xc20 drivers/block/loop.c:1069
 __lo_release drivers/block/loop.c:1660 [inline]
 lo_release+0xff/0x190 drivers/block/loop.c:1678
 __blkdev_put+0x5aa/0x800 fs/block_dev.c:1803
 blkdev_close+0x86/0xb0 fs/block_dev.c:1875
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 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+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1cdc325270
RSP: 002b:00007ffd9282aa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f1cdc325270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f1cdd1df710 R08: 00005618f1495d90 R09: 00005618f1495b00
R10: 00007f1cdd1df8c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00005618f1486900 R14: 0000000000000003 R15: 000000000000000e
Code: 03 42 80 3c 28 00 0f 85 dd 0b 00 00 4d 8b 64 24 18 4d 85 e4 0f 84 fa 0b 00 00 e8 ea 56 57 fa 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 d4 0b 00 00 49 8b 6c 24 20 48 85 ed 74 b0 
RIP: kobject_uevent_env+0xb2/0xf30 lib/kobject_uevent.c:356 RSP: ffff88809f5b7c00
---[ end trace 81f7805df468fdd7 ]---
----------------
Code disassembly (best guess):
   0:	03 42 80             	add    -0x80(%rdx),%eax
   3:	3c 28                	cmp    $0x28,%al
   5:	00 0f                	add    %cl,(%rdi)
   7:	85 dd                	test   %ebx,%ebp
   9:	0b 00                	or     (%rax),%eax
   b:	00 4d 8b             	add    %cl,-0x75(%rbp)
   e:	64 24 18             	fs and $0x18,%al
  11:	4d 85 e4             	test   %r12,%r12
  14:	0f 84 fa 0b 00 00    	je     0xc14
  1a:	e8 ea 56 57 fa       	callq  0xfa575709
  1f:	49 8d 7c 24 20       	lea    0x20(%r12),%rdi
  24:	48 89 f8             	mov    %rdi,%rax
  27:	48 c1 e8 03          	shr    $0x3,%rax
* 2b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  30:	0f 85 d4 0b 00 00    	jne    0xc0a
  36:	49 8b 6c 24 20       	mov    0x20(%r12),%rbp
  3b:	48 85 ed             	test   %rbp,%rbp
  3e:	74 b0                	je     0xfffffff0