jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
general protection fault, probably for non-canonical address 0xdffffc00000000c6: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000630-0x0000000000000637]
CPU: 0 PID: 6178 Comm: syz.2.55 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xb4/0x520 fs/jfs/jfs_txnmgr.c:507
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 bc 07 dc fe 41 bf 30 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 9d 07 dc fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc90003267b60 EFLAGS: 00010206

RAX: 00000000000000c6 RBX: ffffc90002609020 RCX: 1ffff9200064cf50
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 00000000ffffffff
RBP: ffffc90003267dd0 R08: ffffffff90d9454f R09: 1ffffffff21b28a9
R10: dffffc0000000000 R11: fffffbfff21b28aa R12: ffff888078007318
R13: dffffc0000000000 R14: ffffc90002609000 R15: 0000000000000630
FS:  00007fd5892cd6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5892abf98 CR3: 0000000026481000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 jfs_mkdir+0x337/0xa30 fs/jfs/namei.c:293
 vfs_mkdir+0x296/0x440 fs/namei.c:4121
 do_mkdirat+0x1d4/0x440 fs/namei.c:4144
 __do_sys_mkdir fs/namei.c:4164 [inline]
 __se_sys_mkdir fs/namei.c:4162 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4162
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd58838f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fd5892cd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fd5885e6090 RCX: 00007fd58838f749
RDX: 0000000000000000 RSI: 000000000000012c RDI: 0000200000000540
RBP: 00007fd588413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5885e6128 R14: 00007fd5885e6090 R15: 00007ffd611f8d28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xb4/0x520 fs/jfs/jfs_txnmgr.c:507
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 bc 07 dc fe 41 bf 30 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 9d 07 dc fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc90003267b60 EFLAGS: 00010206
RAX: 00000000000000c6 RBX: ffffc90002609020 RCX: 1ffff9200064cf50
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 00000000ffffffff
RBP: ffffc90003267dd0 R08: ffffffff90d9454f R09: 1ffffffff21b28a9
R10: dffffc0000000000 R11: fffffbfff21b28aa R12: ffff888078007318
R13: dffffc0000000000 R14: ffffc90002609000 R15: 0000000000000630
FS:  00007fd5892cd6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5892abf98 CR3: 0000000026481000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	49 8d 5e 20          	lea    0x20(%r14),%rbx
   4:	48 89 d8             	mov    %rbx,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  10:	74 08                	je     0x1a
  12:	48 89 df             	mov    %rbx,%rdi
  15:	e8 bc 07 dc fe       	call   0xfedc07d6
  1a:	41 bf 30 06 00 00    	mov    $0x630,%r15d
  20:	4c 03 3b             	add    (%rbx),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 9d 07 dc fe       	call   0xfedc07d6
  39:	49 8b 1f             	mov    (%r15),%rbx
  3c:	48 83 c3 30          	add    $0x30,%rbx