Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 120 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
RIP: 0010:lmLogSync+0xfb/0x9d0 fs/jfs/jfs_logmgr.c:935
Code: 47 87 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 c3 81 e6 fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 a7 81 e6 fe 49 8b 3f e8 bf bc bd fe
RSP: 0018:ffffc900031afb00 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88801eb79dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900031afc08 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900031afb60 R11: fffff52000635f70 R12: 0000000000000001
R13: ffff888029739000 R14: ffff8881404d8e38 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9871bc9000 CR3: 0000000038910000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_syncpt+0x7b/0x90 fs/jfs/jfs_logmgr.c:1041
 txEnd+0x2e5/0x530 fs/jfs/jfs_txnmgr.c:549
 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline]
 jfs_lazycommit+0x55c/0xa10 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
RIP: 0010:lmLogSync+0xfb/0x9d0 fs/jfs/jfs_logmgr.c:935
Code: 47 87 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 c3 81 e6 fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 a7 81 e6 fe 49 8b 3f e8 bf bc bd fe
RSP: 0018:ffffc900031afb00 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88801eb79dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900031afc08 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900031afb60 R11: fffff52000635f70 R12: 0000000000000001
R13: ffff888029739000 R14: ffff8881404d8e38 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9871bc9000 CR3: 0000000038910000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	47 87 fe             	rex.RXB xchg %r15d,%r14d
   3:	4d 8d 7e d8          	lea    -0x28(%r14),%r15
   7:	4c 89 f8             	mov    %r15,%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 ff             	mov    %r15,%rdi
  17:	e8 c3 81 e6 fe       	call   0xfee681df
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 30          	add    $0x30,%r15
  23:	4c 89 f8             	mov    %r15,%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 ff             	mov    %r15,%rdi
  33:	e8 a7 81 e6 fe       	call   0xfee681df
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 bf bc bd fe       	call   0xfebdbcff