general protection fault, probably for non-canonical address 0xdffffc00000000ba: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000005d0-0x00000000000005d7]
CPU: 0 PID: 4188 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1846 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x2ab/0x9c0 block/blk-cgroup.c:1880
Code: ff df 80 3c 08 00 74 08 48 89 df e8 4f 1f ec fd 41 be d0 05 00 00 4c 03 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 27 1f ec fd bb 90 00 00 00 49 03 1e
RSP: 0018:ffffc900030ef6f0 EFLAGS: 00010202
RAX: 00000000000000ba RBX: ffff88805f753508 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a79fde0 RDI: ffffffff8a79fda0
RBP: 1ffff1100beea6a9 R08: dffffc0000000000 R09: 1ffffffff203aa18
R10: dffffc0000000000 R11: fffffbfff203aa19 R12: ffff88807df3f110
R13: ffff88805f753548 R14: 00000000000005d0 R15: ffff88807429d96c
FS:  000055556fdf4500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ee16b0dac CR3: 0000000064a60000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bio_associate_blkg+0x23a/0x340 block/blk-cgroup.c:1908
 lbmStartIO+0x204/0x4c0 fs/jfs/jfs_logmgr.c:2130
 lbmWrite+0x361/0x480 fs/jfs/jfs_logmgr.c:2079
 lmGCwrite fs/jfs/jfs_logmgr.c:-1 [inline]
 lmNextPage+0x6ae/0xa00 fs/jfs/jfs_logmgr.c:614
 lmWriteRecord+0x512/0x1aa0 fs/jfs/jfs_logmgr.c:441
 lmLog+0x6f6/0xa30 fs/jfs/jfs_logmgr.c:314
 diLog fs/jfs/jfs_txnmgr.c:1453 [inline]
 txLog fs/jfs/jfs_txnmgr.c:1405 [inline]
 txCommit+0x16e5/0x5200 fs/jfs/jfs_txnmgr.c:1265
 jfs_unlink+0x582/0xa00 fs/jfs/namei.c:555
 vfs_unlink+0x385/0x600 fs/namei.c:4288
 do_unlinkat+0x391/0x710 fs/namei.c:4356
 __do_sys_unlink fs/namei.c:4404 [inline]
 __se_sys_unlink fs/namei.c:4402 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4402
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9dbf3d0ec7
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc3082d098 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9dbf3d0ec7
RDX: 00007ffc3082d0c0 RSI: 00007ffc3082d150 RDI: 00007ffc3082d150
RBP: 00007ffc3082d150 R08: 00007ffc3082e150 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc3082e240
R13: 00007f9dbf467120 R14: 0000000000027815 R15: 00007ffc3082f310
 </TASK>
Modules linked in:
---[ end trace c8f77cfb4e5d14d1 ]---
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1846 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x2ab/0x9c0 block/blk-cgroup.c:1880
Code: ff df 80 3c 08 00 74 08 48 89 df e8 4f 1f ec fd 41 be d0 05 00 00 4c 03 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 27 1f ec fd bb 90 00 00 00 49 03 1e
RSP: 0018:ffffc900030ef6f0 EFLAGS: 00010202
RAX: 00000000000000ba RBX: ffff88805f753508 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a79fde0 RDI: ffffffff8a79fda0
RBP: 1ffff1100beea6a9 R08: dffffc0000000000 R09: 1ffffffff203aa18
R10: dffffc0000000000 R11: fffffbfff203aa19 R12: ffff88807df3f110
R13: ffff88805f753548 R14: 00000000000005d0 R15: ffff88807429d96c
FS:  000055556fdf4500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ed7f66000 CR3: 0000000064a60000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000003 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ff                   	lcall  (bad)
   1:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   7:	08 48 89             	or     %cl,-0x77(%rax)
   a:	df e8                	fucomip %st(0),%st
   c:	4f 1f                	rex.WRXB (bad)
   e:	ec                   	in     (%dx),%al
   f:	fd                   	std
  10:	41 be d0 05 00 00    	mov    $0x5d0,%r14d
  16:	4c 03 33             	add    (%rbx),%r14
  19:	4c 89 f0             	mov    %r14,%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:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 27 1f ec fd       	call   0xfdec1f5f
  38:	bb 90 00 00 00       	mov    $0x90,%ebx
  3d:	49 03 1e             	add    (%r14),%rbx