syzbot

read_mapping_page failed!
diRead: diIAGRead returned -5
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 5838 Comm: syz-executor376 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 43 62 7a fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c0 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 da 00 00 00 49 8b 7d 30 2e e8 3b ad 1d 08 48 8d
RSP: 0018:ffffc900030c7ae8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff8880281b6000 RCX: ffffffff81effb7e
RDX: ffff88802e61da00 RSI: ffffffff8340934d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81f0c210
R13: 0000000000000000 R14: ffff888027860000 R15: ffff8880278601d0
FS:  0000555561e36380(0000) GS:ffff888124f5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555de2e295e8 CR3: 00000000765d0000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 jfs_flush_journal+0x3e6/0xa40 fs/jfs/jfs_logmgr.c:1573
 jfs_umount+0x17a/0x440 fs/jfs/jfs_umount.c:58
 jfs_fill_super+0xd36/0x1060 fs/jfs/super.c:567
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1636
 vfs_get_tree+0x8e/0x340 fs/super.c:1759
 do_new_mount fs/namespace.c:3878 [inline]
 path_mount+0x14d4/0x1f30 fs/namespace.c:4205
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount fs/namespace.c:4406 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff368b93f5a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee87435c8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffee87435e0 RCX: 00007ff368b93f5a
RDX: 0000200000000000 RSI: 00002000000002c0 RDI: 00007ffee87435e0
RBP: 00002000000002c0 R08: 00007ffee8743620 R09: 000000000000614a
R10: 0000000000000000 R11: 0000000000000282 R12: 0000200000000000
R13: 00007ffee8743620 R14: 0000000000000003 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 43 62 7a fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c0 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 da 00 00 00 49 8b 7d 30 2e e8 3b ad 1d 08 48 8d
RSP: 0018:ffffc900030c7ae8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff8880281b6000 RCX: ffffffff81effb7e
RDX: ffff88802e61da00 RSI: ffffffff8340934d RDI: 0000000000000030
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	43 62                	rex.XB (bad)
   4:	7a fe                	jp     0x4
   6:	48 8d 7b 10          	lea    0x10(%rbx),%rdi
   a:	48 89 f8             	mov    %rdi,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  15:	0f 85 c0 00 00 00    	jne    0xdb
  1b:	4c 8b 6b 10          	mov    0x10(%rbx),%r13
  1f:	49 8d 7d 30          	lea    0x30(%r13),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	0f 85 da 00 00 00    	jne    0x10e
  34:	49 8b 7d 30          	mov    0x30(%r13),%rdi
  38:	2e e8 3b ad 1d 08    	cs call 0x81dad79
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d