lmLogOpen: exit(-6)
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
ERROR: (device loop0): txBegin: read-only filesystem

ERROR: (device loop0): remounting filesystem as read-only
jfs_dirty_inode called on read-only volume
Is remount racy?
find_entry called with index = 0
find_entry called with index = 0
find_entry called with index = 0
find_entry called with index = 0
jfs_dirty_inode called on read-only volume
Is remount racy?
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cf: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000678-0x000000000000067f]
CPU: 0 UID: 0 PID: 5326 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xb4/0x530 fs/jfs/jfs_txnmgr.c:508
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 8c 1c c5 fe 41 bf 78 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 6d 1c c5 fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc9000ec1fb00 EFLAGS: 00010206
RAX: 00000000000000cf RBX: ffffc900010e9020 RCX: ffffffff9a9f9501
RDX: 0000000000000001 RSI: ffffffff8e41ae90 RDI: 00000000ffffffff
RBP: ffffc9000ec1fd68 R08: ffffffff907a897f R09: 1ffffffff20f512f
R10: dffffc0000000000 R11: fffffbfff20f5130 R12: 1ffff92001d83f70
R13: dffffc0000000000 R14: ffffc900010e9000 R15: 0000000000000678
FS:  00007ffa04d116c0(0000) GS:ffff88808c2bb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9472ed02b0 CR3: 0000000041ff3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 jfs_mknod+0x323/0x9d0 fs/jfs/namei.c:1433
 vfs_mknod+0x441/0x600 fs/namei.c:5269
 filename_mknodat+0x3cb/0x660 fs/namei.c:-1
 __do_sys_mknodat fs/namei.c:5350 [inline]
 __se_sys_mknodat+0x3b/0x150 fs/namei.c:5346
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa03d9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa04d10fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007ffa04026180 RCX: 00007ffa03d9e159
RDX: 0000000000001004 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007ffa03e3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000701 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa04026218 R14: 00007ffa04026180 R15: 00007ffddebec878
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xb4/0x530 fs/jfs/jfs_txnmgr.c:508
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 8c 1c c5 fe 41 bf 78 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 6d 1c c5 fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc9000ec1fb00 EFLAGS: 00010206
RAX: 00000000000000cf RBX: ffffc900010e9020 RCX: ffffffff9a9f9501
RDX: 0000000000000001 RSI: ffffffff8e41ae90 RDI: 00000000ffffffff
RBP: ffffc9000ec1fd68 R08: ffffffff907a897f R09: 1ffffffff20f512f
R10: dffffc0000000000 R11: fffffbfff20f5130 R12: 1ffff92001d83f70
R13: dffffc0000000000 R14: ffffc900010e9000 R15: 0000000000000678
FS:  00007ffa04d116c0(0000) GS:ffff88808c2bb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9472ed02b0 CR3: 0000000041ff3000 CR4: 0000000000352ef0
----------------
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 8c 1c c5 fe       	call   0xfec51ca6
  1a:	41 bf 78 06 00 00    	mov    $0x678,%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 6d 1c c5 fe       	call   0xfec51ca6
  39:	49 8b 1f             	mov    (%r15),%rbx
  3c:	48 83 c3 30          	add    $0x30,%rbx