loop4: detected capacity change from 0 to 32768
general protection fault, probably for non-canonical address 0xdffffc00000000ba: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000005d0-0x00000000000005d7]
CPU: 1 PID: 4606 Comm: syz.4.91 Not tainted 5.15.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1831 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x293/0x960 block/blk-cgroup.c:1865
Code: c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 e6 04 c9 fd bd d0 05 00 00 49 03 2e 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 bf 04 c9 fd bb 90 00 00 00 48 03 5d
RSP: 0018:ffffc900031bf510 EFLAGS: 00010202
RAX: 00000000000000ba RBX: 0000000000000001 RCX: dffffc0000000000
RDX: ffffc90005ba9000 RSI: 000000000000b66f RDI: 000000000000b670
RBP: 00000000000005d0 R08: ffffffff84015a4b R09: fffffbfff2131221
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888020368000
R13: ffff888060574dc0 R14: ffff888060574dc8 R15: ffff88802105bbac
FS:  00007f7e06c8f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002002d000 CR3: 0000000076335000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bio_associate_blkg+0x220/0x330 block/blk-cgroup.c:1893
 lbmStartIO+0x207/0x4b0 fs/jfs/jfs_logmgr.c:2130
 lbmWrite+0x379/0x4a0 fs/jfs/jfs_logmgr.c:2079
 lmNextPage+0x712/0xa60
 lmWriteRecord+0x4c3/0x12e0 fs/jfs/jfs_logmgr.c:441
 lmLog+0x792/0xab0 fs/jfs/jfs_logmgr.c:314
 dtLog fs/jfs/jfs_txnmgr.c:1652 [inline]
 txLog fs/jfs/jfs_txnmgr.c:1400 [inline]
 txCommit+0x236b/0x6ba0 fs/jfs/jfs_txnmgr.c:1264
 jfs_create+0x98a/0xbb0 fs/jfs/namei.c:156
 vfs_create+0x306/0x490 fs/namei.c:3162
 do_mknodat+0x3f5/0x690 fs/namei.c:3994
 __do_sys_mknod fs/namei.c:4027 [inline]
 __se_sys_mknod fs/namei.c:4025 [inline]
 __x64_sys_mknod+0x8a/0xa0 fs/namei.c:4025
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7e08e1ed29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7e06c8f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f7e0900efa0 RCX: 00007f7e08e1ed29
RDX: 0000000000000709 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f7e08e9aaa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7e0900efa0 R15: 00007ffef692eff8
 </TASK>
Modules linked in:
---[ end trace 565dc4e998ad496b ]---
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1831 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x293/0x960 block/blk-cgroup.c:1865
Code: c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 e6 04 c9 fd bd d0 05 00 00 49 03 2e 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 bf 04 c9 fd bb 90 00 00 00 48 03 5d
RSP: 0018:ffffc900031bf510 EFLAGS: 00010202
RAX: 00000000000000ba RBX: 0000000000000001 RCX: dffffc0000000000
RDX: ffffc90005ba9000 RSI: 000000000000b66f RDI: 000000000000b670
RBP: 00000000000005d0 R08: ffffffff84015a4b R09: fffffbfff2131221
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888020368000
R13: ffff888060574dc0 R14: ffff888060574dc8 R15: ffff88802105bbac
FS:  00007f7e06c8f6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c64602ab8 CR3: 0000000076335000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 e8 03             	shr    $0x3,%eax
   3:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
   7:	74 08                	je     0x11
   9:	4c 89 f7             	mov    %r14,%rdi
   c:	e8 e6 04 c9 fd       	call   0xfdc904f7
  11:	bd d0 05 00 00       	mov    $0x5d0,%ebp
  16:	49 03 2e             	add    (%r14),%rbp
  19:	48 89 e8             	mov    %rbp,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 ef             	mov    %rbp,%rdi
  33:	e8 bf 04 c9 fd       	call   0xfdc904f7
  38:	bb 90 00 00 00       	mov    $0x90,%ebx
  3d:	48                   	rex.W
  3e:	03                   	.byte 0x3
  3f:	5d                   	pop    %rbp