find_entry called with index = 0
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000c7: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000638-0x000000000000063f]
CPU: 0 UID: 0 PID: 5750 Comm: syz.0.16 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:507
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 6c 2a d1 fe 41 bf 38 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 4d 2a d1 fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc90005ad76c0 EFLAGS: 00010202
RAX: 00000000000000c7 RBX: ffffc90000ed1020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8defc169 RDI: 00000000ffffffff
RBP: ffffc90005ad7950 R08: ffffffff9011d8b7 R09: 1ffffffff2023b16
R10: dffffc0000000000 R11: fffffbfff2023b17 R12: 00000000ffffffe2
R13: dffffc0000000000 R14: ffffc90000ed1000 R15: 0000000000000638
FS:  00007fe02be296c0(0000) GS:ffff88808ca51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe02afe6800 CR3: 0000000035c7d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 jfs_create+0x377/0xb10 fs/jfs/namei.c:160
 lookup_open fs/namei.c:4483 [inline]
 open_last_lookups fs/namei.c:4583 [inline]
 path_openat+0x1395/0x3860 fs/namei.c:4827
 do_file_open+0x23e/0x4a0 fs/namei.c:4859
 do_sys_openat2+0x113/0x200 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe02af990b9
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:00007fe02be29028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe02b1c5fa0 RCX: 00007fe02af990b9
RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007fe02b02b9c4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe02b1c5fa0 R15: 00007ffd11ff6f88
 </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:507
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 6c 2a d1 fe 41 bf 38 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 4d 2a d1 fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc90005ad76c0 EFLAGS: 00010202
RAX: 00000000000000c7 RBX: ffffc90000ed1020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8defc169 RDI: 00000000ffffffff
RBP: ffffc90005ad7950 R08: ffffffff9011d8b7 R09: 1ffffffff2023b16
R10: dffffc0000000000 R11: fffffbfff2023b17 R12: 00000000ffffffe2
R13: dffffc0000000000 R14: ffffc90000ed1000 R15: 0000000000000638
FS:  00007fe02be296c0(0000) GS:ffff88808ca51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe02afe6800 CR3: 0000000035c7d000 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 6c 2a d1 fe       	call   0xfed12a86
  1a:	41 bf 38 06 00 00    	mov    $0x638,%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 4d 2a d1 fe       	call   0xfed12a86
  39:	49 8b 1f             	mov    (%r15),%rbx
  3c:	48 83 c3 30          	add    $0x30,%rbx