loop3: 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: 4469 Comm: syz.3.75 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1842 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x2ab/0x9c0 block/blk-cgroup.c:1876
Code: ff df 80 3c 08 00 74 08 48 89 df e8 8f fd f2 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 67 fd f2 fd bb 90 00 00 00 49 03 1e
RSP: 0018:ffffc900014ef7b0 EFLAGS: 00010202
RAX: 00000000000000ba RBX: ffff8880252fedc8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a59a220 RDI: ffffffff8a59a1e0
RBP: 1ffff11004a5fdc1 R08: dffffc0000000000 R09: fffffbfff1ff7619
R10: fffffbfff1ff7619 R11: 1ffffffff1ff7618 R12: ffff8881476cc110
R13: ffff8880252fee08 R14: 00000000000005d0 R15: ffff888026bbd96c
FS:  000055556a573500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f594fc2b000 CR3: 00000000230f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bio_associate_blkg+0x23a/0x340 block/blk-cgroup.c:1904
 lbmStartIO+0x204/0x4c0 fs/jfs/jfs_logmgr.c:2130
 lbmWrite+0x361/0x480 fs/jfs/jfs_logmgr.c:2079
 lmNextPage+0x386/0xa00 fs/jfs/jfs_logmgr.c:-1
 lmWriteRecord+0xf9d/0x1aa0 fs/jfs/jfs_logmgr.c:537
 lmLog+0x6f6/0xa30 fs/jfs/jfs_logmgr.c:314
 logMOUNT fs/jfs/jfs_mount.c:495 [inline]
 jfs_mount_rw+0x3e9/0x5c0 fs/jfs/jfs_mount.c:268
 jfs_fill_super+0x5bb/0xaf0 fs/jfs/super.c:570
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3025
 do_mount fs/namespace.c:3368 [inline]
 __do_sys_mount fs/namespace.c:3576 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553
 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: 0033:0x7f5842fe538a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc4ed61e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc4ed61ea0 RCX: 00007f5842fe538a
RDX: 0000200000000040 RSI: 0000200000000180 RDI: 00007ffc4ed61e60
RBP: 0000200000000040 R08: 00007ffc4ed61ea0 R09: 000000000000001a
R10: 000000000000001a R11: 0000000000000246 R12: 0000200000000180
R13: 00007ffc4ed61e60 R14: 000000000000604e R15: 0000200000006240
 </TASK>
Modules linked in:
---[ end trace 958140b51dbbca55 ]---
RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1842 [inline]
RIP: 0010:bio_associate_blkg_from_css+0x2ab/0x9c0 block/blk-cgroup.c:1876
Code: ff df 80 3c 08 00 74 08 48 89 df e8 8f fd f2 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 67 fd f2 fd bb 90 00 00 00 49 03 1e
RSP: 0018:ffffc900014ef7b0 EFLAGS: 00010202
RAX: 00000000000000ba RBX: ffff8880252fedc8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8a59a220 RDI: ffffffff8a59a1e0
RBP: 1ffff11004a5fdc1 R08: dffffc0000000000 R09: fffffbfff1ff7619
R10: fffffbfff1ff7619 R11: 1ffffffff1ff7618 R12: ffff8881476cc110
R13: ffff8880252fee08 R14: 00000000000005d0 R15: ffff888026bbd96c
FS:  000055556a573500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f594fc2b000 CR3: 00000000230f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)
   4:	74 08                	je     0xe
   6:	48 89 df             	mov    %rbx,%rdi
   9:	e8 8f fd f2 fd       	call   0xfdf2fd9d
   e:	41 be d0 05 00 00    	mov    $0x5d0,%r14d
  14:	4c 03 33             	add    (%rbx),%r14
  17:	4c 89 f0             	mov    %r14,%rax
  1a:	48 c1 e8 03          	shr    $0x3,%rax
  1e:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  25:	fc ff df
* 28:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2c:	74 08                	je     0x36
  2e:	4c 89 f7             	mov    %r14,%rdi
  31:	e8 67 fd f2 fd       	call   0xfdf2fd9d
  36:	bb 90 00 00 00       	mov    $0x90,%ebx
  3b:	49 03 1e             	add    (%r14),%rbx