loop0: detected capacity change from 0 to 32768
loop0: detected capacity change from 32768 to 32767
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
ERROR: (device loop0): dbFindCtl: Corrupt dmapctl page
jfs_create: dtInsert returned -EIO
ERROR: (device (efault)): jfs_create: 
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:sb_rdonly include/linux/fs.h:2292 [inline]
RIP: 0010:jfs_handle_error fs/jfs/super.c:66 [inline]
RIP: 0010:jfs_error+0x159/0x2e0 fs/jfs/super.c:98
Code: 08 48 c7 c7 40 e9 42 8c 48 89 74 24 08 4c 89 f9 e8 4c 22 9c 08 4d 8d 65 50 4d 89 e7 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <41> 80 3c 07 00 74 08 4c 89 e7 e8 48 5e d6 fe 49 8b 1c 24 48 89 de
RSP: 0018:ffffc9000d267a20 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: a0c48332ad6ecb00
RDX: ffffc9000d7e2000 RSI: 0000000000003e2a RDI: 0000000000003e2b
RBP: ffffc9000d267b30 R08: ffffffff8174a13c R09: 1ffff92001a4cee0
R10: dffffc0000000000 R11: fffff52001a4cee1 R12: 0000000000000050
R13: 0000000000000000 R14: 1ffff92001a4cf4c R15: 000000000000000a
FS:  00007f7fcbcf06c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7fbfe3f000 CR3: 000000003b92a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_create+0x81d/0xbb0 fs/jfs/namei.c:140
 vfs_create+0x23c/0x3d0 fs/namei.c:3294
 do_mknodat+0x447/0x5b0 fs/namei.c:4185
 __do_sys_mknod fs/namei.c:4218 [inline]
 __se_sys_mknod fs/namei.c:4216 [inline]
 __x64_sys_mknod+0x8c/0xa0 fs/namei.c:4216
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7fcaf7e719
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:00007f7fcbcf0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f7fcb135f80 RCX: 00007f7fcaf7e719
RDX: 0000000000000701 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f7fcaff1616 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7fcb135f80 R15: 00007ffd4c2e9638
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sb_rdonly include/linux/fs.h:2292 [inline]
RIP: 0010:jfs_handle_error fs/jfs/super.c:66 [inline]
RIP: 0010:jfs_error+0x159/0x2e0 fs/jfs/super.c:98
Code: 08 48 c7 c7 40 e9 42 8c 48 89 74 24 08 4c 89 f9 e8 4c 22 9c 08 4d 8d 65 50 4d 89 e7 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <41> 80 3c 07 00 74 08 4c 89 e7 e8 48 5e d6 fe 49 8b 1c 24 48 89 de
RSP: 0018:ffffc9000d267a20 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: a0c48332ad6ecb00
RDX: ffffc9000d7e2000 RSI: 0000000000003e2a RDI: 0000000000003e2b
RBP: ffffc9000d267b30 R08: ffffffff8174a13c R09: 1ffff92001a4cee0
R10: dffffc0000000000 R11: fffff52001a4cee1 R12: 0000000000000050
R13: 0000000000000000 R14: 1ffff92001a4cf4c R15: 000000000000000a
FS:  00007f7fcbcf06c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558fc856f628 CR3: 000000003b92a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	08 48 c7             	or     %cl,-0x39(%rax)
   3:	c7 40 e9 42 8c 48 89 	movl   $0x89488c42,-0x17(%rax)
   a:	74 24                	je     0x30
   c:	08 4c 89 f9          	or     %cl,-0x7(%rcx,%rcx,4)
  10:	e8 4c 22 9c 08       	call   0x89c2261
  15:	4d 8d 65 50          	lea    0x50(%r13),%r12
  19:	4d 89 e7             	mov    %r12,%r15
  1c:	49 c1 ef 03          	shr    $0x3,%r15
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 80 3c 07 00       	cmpb   $0x0,(%r15,%rax,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 48 5e d6 fe       	call   0xfed65e81
  39:	49 8b 1c 24          	mov    (%r12),%rbx
  3d:	48 89 de             	mov    %rbx,%rsi