syz-executor.0 (19076): drop_caches: 2
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 97b43067 P4D 97b43067 PUD a5acc067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 19103 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline]
RIP: 0010:test_and_set_bit_lock arch/x86/include/asm/bitops.h:223 [inline]
RIP: 0010:trylock_buffer include/linux/buffer_head.h:367 [inline]
RIP: 0010:lock_buffer include/linux/buffer_head.h:373 [inline]
RIP: 0010:udf_getblk+0x1c1/0x390 fs/udf/inode.c:464
Code: e5 01 89 ee e8 90 f5 f2 fe 40 84 ed 0f 84 00 01 00 00 e8 52 f4 f2 fe 31 d2 be 74 01 00 00 48 c7 c7 a0 80 9a 88 e8 ff e3 d1 fe <f0> 49 0f ba 2c 24 02 40 0f 92 c5 31 ff 89 ee e8 5b f5 f2 fe 40 84
RSP: 0018:ffff88809d9df4d8 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 1ffff11013b3be9d RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888099436324
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000004c92587c R12: 0000000000000000
R13: ffff8880a2f43670 R14: ffff8880a2f43698 R15: dffffc0000000000
FS:  00007fb75f196700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000afc6a000 CR4: 00000000003426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 udf_bread+0x85/0x240 fs/udf/inode.c:1206
 udf_add_entry+0xfda/0x2a20 fs/udf/namei.c:509
 udf_add_nondir+0xf9/0x400 fs/udf/namei.c:602
 udf_create+0x130/0x180 fs/udf/namei.c:639
 lookup_open+0x893/0x1a20 fs/namei.c:3235
 do_last fs/namei.c:3327 [inline]
 path_openat+0x1094/0x2df0 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: 0033:0x7fb7608655a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb75f196168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb760986120 RCX: 00007fb7608655a9
RDX: 000000000000275a RSI: 0000000020000140 RDI: ffffffffffffff9c
RBP: 00007fb7608c0580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdc7877e7f R14: 00007fb75f196300 R15: 0000000000022000
Modules linked in:
CR2: 0000000000000000
---[ end trace 6dda99c52737cf33 ]---
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline]
RIP: 0010:test_and_set_bit_lock arch/x86/include/asm/bitops.h:223 [inline]
RIP: 0010:trylock_buffer include/linux/buffer_head.h:367 [inline]
RIP: 0010:lock_buffer include/linux/buffer_head.h:373 [inline]
RIP: 0010:udf_getblk+0x1c1/0x390 fs/udf/inode.c:464
Code: e5 01 89 ee e8 90 f5 f2 fe 40 84 ed 0f 84 00 01 00 00 e8 52 f4 f2 fe 31 d2 be 74 01 00 00 48 c7 c7 a0 80 9a 88 e8 ff e3 d1 fe <f0> 49 0f ba 2c 24 02 40 0f 92 c5 31 ff 89 ee e8 5b f5 f2 fe 40 84
RSP: 0018:ffff88809d9df4d8 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 1ffff11013b3be9d RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888099436324
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 000000004c92587c R12: 0000000000000000
R13: ffff8880a2f43670 R14: ffff8880a2f43698 R15: dffffc0000000000
FS:  00007fb75f196700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000afc6a000 CR4: 00000000003426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e5 01                	in     $0x1,%eax
   2:	89 ee                	mov    %ebp,%esi
   4:	e8 90 f5 f2 fe       	callq  0xfef2f599
   9:	40 84 ed             	test   %bpl,%bpl
   c:	0f 84 00 01 00 00    	je     0x112
  12:	e8 52 f4 f2 fe       	callq  0xfef2f469
  17:	31 d2                	xor    %edx,%edx
  19:	be 74 01 00 00       	mov    $0x174,%esi
  1e:	48 c7 c7 a0 80 9a 88 	mov    $0xffffffff889a80a0,%rdi
  25:	e8 ff e3 d1 fe       	callq  0xfed1e429
* 2a:	f0 49 0f ba 2c 24 02 	lock btsq $0x2,(%r12) <-- trapping instruction
  31:	40 0f 92 c5          	setb   %bpl
  35:	31 ff                	xor    %edi,%edi
  37:	89 ee                	mov    %ebp,%esi
  39:	e8 5b f5 f2 fe       	callq  0xfef2f599
  3e:	40                   	rex
  3f:	84                   	.byte 0x84