syzbot

read_mapping_page failed!
diRead: diIAGRead returned -5
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 9364 Comm: syz.6.1202 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x812/0xec0 fs/jfs/jfs_logmgr.c:1573
Code: 7c ae fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 bc ce d8 fe 4d 8b 26 49 83 c4 40 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 a0 ce d8 fe 49 8b 3c 24 e8 57 7c ae
RSP: 0018:ffffc90005687a00 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: fd5e0298678e9300
RDX: ffffc9001c6af000 RSI: 000000000000e314 RDI: 000000000000e315
RBP: ffffc90005687b28 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc90005687924 R11: fffff52000ad0f2d R12: 0000000000000040
R13: ffff88807e5499a8 R14: ffff88804e816428 R15: ffff88804e816438
FS:  00007f53d8fe56c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f326ad909c0 CR3: 0000000032d6a000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 jfs_umount+0x178/0x3c0 fs/jfs/jfs_umount.c:58
 jfs_fill_super+0x80e/0xad0 fs/jfs/super.c:600
 mount_bdev+0x221/0x2d0 fs/super.c:1643
 legacy_get_tree+0xea/0x180 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f53d819da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53d8fe4e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f53d8fe4ee0 RCX: 00007f53d819da0a
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007f53d8fe4ea0
RBP: 0000200000000080 R08: 00007f53d8fe4ee0 R09: 0000000002010880
R10: 0000000002010880 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f53d8fe4ea0 R14: 00000000000060a5 R15: 0000200000000400
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x812/0xec0 fs/jfs/jfs_logmgr.c:1573
Code: 7c ae fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 bc ce d8 fe 4d 8b 26 49 83 c4 40 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 a0 ce d8 fe 49 8b 3c 24 e8 57 7c ae
RSP: 0018:ffffc90005687a00 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: fd5e0298678e9300
RDX: ffffc9001c6af000 RSI: 000000000000e314 RDI: 000000000000e315
RBP: ffffc90005687b28 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc90005687924 R11: fffff52000ad0f2d R12: 0000000000000040
R13: ffff88807e5499a8 R14: ffff88804e816428 R15: ffff88804e816438
FS:  00007f53d8fe56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa688de82f8 CR3: 0000000032d6a000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	7c ae                	jl     0xffffffb0
   2:	fe 4d 8d             	decb   -0x73(%rbp)
   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 bc ce d8 fe       	call   0xfed8ced8
  1c:	4d 8b 26             	mov    (%r14),%r12
  1f:	49 83 c4 40          	add    $0x40,%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 a0 ce d8 fe       	call   0xfed8ced8
  38:	49 8b 3c 24          	mov    (%r12),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	57                   	push   %rdi
  3e:	7c ae                	jl     0xffffffee