ERROR: (device loop1): remounting filesystem as read-only
general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 PID: 4278 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x80e/0xec0 fs/jfs/jfs_logmgr.c:1573
Code: 35 b8 fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 d0 f1 df fe 4d 8b 26 49 83 c4 30 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 b4 f1 df fe 49 8b 3c 24 e8 cb 34 b8
RSP: 0018:ffffc90003ea79c0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ef5ec3f33fea5200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003ea7af8 R08: ffffc90003ea7927 R09: ffffc90003ea78e4
R10: dffffc0000000000 R11: fffff520007d4f25 R12: 0000000000000030
R13: ffff8880243c61a8 R14: ffff88807c735628 R15: ffff88807c735638
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f79992da4e8 CR3: 000000002380b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_umount+0xf8/0x360 fs/jfs/jfs_umount.c:58
 jfs_put_super+0x88/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x130/0x340 fs/super.c:501
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x982/0x2480 kernel/exit.c:880
 do_group_exit+0x217/0x2d0 kernel/exit.c:1022
 __do_sys_exit_group kernel/exit.c:1033 [inline]
 __se_sys_exit_group kernel/exit.c:1031 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fad8119acb9
Code: Unable to access opcode bytes at 0x7fad8119ac8f.
RSP: 002b:00007fff6b1f7248 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fad81204773 RCX: 00007fad8119acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000002 R08: 0000000000000000 R09: 00007fad8120471f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6b1f8500
R13: 00007fad8120471f R14: 00005555719ca4e8 R15: 00007fff6b1f95d0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x80e/0xec0 fs/jfs/jfs_logmgr.c:1573
Code: 35 b8 fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 d0 f1 df fe 4d 8b 26 49 83 c4 30 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 b4 f1 df fe 49 8b 3c 24 e8 cb 34 b8
RSP: 0018:ffffc90003ea79c0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ef5ec3f33fea5200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003ea7af8 R08: ffffc90003ea7927 R09: ffffc90003ea78e4
R10: dffffc0000000000 R11: fffff520007d4f25 R12: 0000000000000030
R13: ffff8880243c61a8 R14: ffff88807c735628 R15: ffff88807c735638
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc843b4000 CR3: 0000000028fe1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	35 b8 fe 4d 8d       	xor    $0x8d4dfeb8,%eax
   5:	77 f0                	ja     0xfffffff7
   7:	4c 89 f0             	mov    %r14,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  12:	74 08                	je     0x1c
  14:	4c 89 f7             	mov    %r14,%rdi
  17:	e8 d0 f1 df fe       	call   0xfedff1ec
  1c:	4d 8b 26             	mov    (%r14),%r12
  1f:	49 83 c4 30          	add    $0x30,%r12
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 e7             	mov    %r12,%rdi
  33:	e8 b4 f1 df fe       	call   0xfedff1ec
  38:	49 8b 3c 24          	mov    (%r12),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	cb                   	lret
  3e:	34 b8                	xor    $0xb8,%al