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
CPU: 0 PID: 8101 Comm: syz-executor328 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cdev_get fs/char_dev.c:359 [inline]
RIP: 0010:chrdev_open+0xb8/0x770 fs/char_dev.c:409
Code: 8b ac 24 88 03 00 00 48 85 ed 0f 84 7f 02 00 00 e8 0d d1 be ff 48 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9e 05 00 00 4c 8b 7d 40 4d 85 ff 74 22 e8 e0 d0
RSP: 0018:ffff8880994e79e8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 1ffff1101329cf3f RCX: ffffffff814bdebb
RDX: 0000000000000008 RSI: ffffffff81a3b463 RDI: 0000000000000042
RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff1407a30
R10: ffffffff8a03d183 R11: 0000000000000000 R12: ffff88808cbad6c0
R13: ffff8880af2782c0 R14: ffff88808cbada48 R15: ffff8880af2782e8
FS:  0000555556ea73c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd673039c0 CR3: 00000000a5a56000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_dentry_open+0x4aa/0x1160 fs/open.c:796
 do_last fs/namei.c:3421 [inline]
 path_openat+0x793/0x2df0 fs/namei.c:3537
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f954eaab929
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd78ce7aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffd78ce7ab8 RCX: 00007f954eaab929
RDX: 0000000000000034 RSI: 0000000000080082 RDI: 0000000020000040
RBP: 00007ffd78ce7ab0 R08: 00007f954ea69bf0 R09: 00007f954ea69bf0
R10: 00007f954ea69bf0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 120c0d5105b0a03b ]---
RIP: 0010:cdev_get fs/char_dev.c:359 [inline]
RIP: 0010:chrdev_open+0xb8/0x770 fs/char_dev.c:409
Code: 8b ac 24 88 03 00 00 48 85 ed 0f 84 7f 02 00 00 e8 0d d1 be ff 48 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9e 05 00 00 4c 8b 7d 40 4d 85 ff 74 22 e8 e0 d0
RSP: 0018:ffff8880994e79e8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 1ffff1101329cf3f RCX: ffffffff814bdebb
RDX: 0000000000000008 RSI: ffffffff81a3b463 RDI: 0000000000000042
RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff1407a30
R10: ffffffff8a03d183 R11: 0000000000000000 R12: ffff88808cbad6c0
R13: ffff8880af2782c0 R14: ffff88808cbada48 R15: ffff8880af2782e8
FS:  0000555556ea73c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd673039c0 CR3: 00000000a5a56000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8b ac 24 88 03 00 00 	mov    0x388(%rsp),%ebp
   7:	48 85 ed             	test   %rbp,%rbp
   a:	0f 84 7f 02 00 00    	je     0x28f
  10:	e8 0d d1 be ff       	callq  0xffbed122
  15:	48 8d 7d 40          	lea    0x40(%rbp),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 9e 05 00 00    	jne    0x5d2
  34:	4c 8b 7d 40          	mov    0x40(%rbp),%r15
  38:	4d 85 ff             	test   %r15,%r15
  3b:	74 22                	je     0x5f
  3d:	e8                   	.byte 0xe8
  3e:	e0 d0                	loopne 0x10