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: 1 PID: 16252 Comm: syz-executor.3 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
task: ffff8880965a8140 task.stack: ffff8880a43f8000
RIP: 0010:is_loop_device drivers/block/loop.c:632 [inline]
RIP: 0010:loop_validate_file+0x1ef/0x2c0 drivers/block/loop.c:643
RSP: 0018:ffff8880a43ffbf0 EFLAGS: 00010202
RAX: 0000000000000037 RBX: ffff8880b1adc918 RCX: ffffc9000940e000
RDX: 0000000000000056 RSI: ffffffff838d5391 RDI: 00000000000001b8
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880965a8140 R12: ffff8880b1adc180
R13: dffffc0000000000 R14: 00000000fffffff0 R15: ffff8880b38e2000
FS:  00007fbb7e2cf700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6232c73988 CR3: 00000000b46ef000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_set_fd drivers/block/loop.c:907 [inline]
 lo_ioctl+0xa7c/0x1cd0 drivers/block/loop.c:1422
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
 block_ioctl+0xd9/0x120 fs/block_dev.c:1893
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbb7fd5d0f9
RSP: 002b:00007fbb7e2cf168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb7fe7cf80 RCX: 00007fbb7fd5d0f9
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 00007fbb7fdb8ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff48db24df R14: 00007fbb7e2cf300 R15: 0000000000022000
Code: f0 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 d1 00 00 00 48 8b ad f0 00 00 00 48 8d bd b8 01 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a7 00 00 00 48 8b ad b8 01 00 00 48 89 e8 
RIP: is_loop_device drivers/block/loop.c:632 [inline] RSP: ffff8880a43ffbf0
RIP: loop_validate_file+0x1ef/0x2c0 drivers/block/loop.c:643 RSP: ffff8880a43ffbf0
---[ end trace ed4c68c831c7023f ]---
----------------
Code disassembly (best guess):
   0:	f0 00 00             	lock add %al,(%rax)
   3:	00 48 89             	add    %cl,-0x77(%rax)
   6:	f8                   	clc
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  10:	0f 85 d1 00 00 00    	jne    0xe7
  16:	48 8b ad f0 00 00 00 	mov    0xf0(%rbp),%rbp
  1d:	48 8d bd b8 01 00 00 	lea    0x1b8(%rbp),%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 a7 00 00 00    	jne    0xdd
  36:	48 8b ad b8 01 00 00 	mov    0x1b8(%rbp),%rbp
  3d:	48 89 e8             	mov    %rbp,%rax