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 PTI
KASAN: null-ptr-deref in range [0x0000000000000638-0x000000000000063f]
CPU: 1 UID: 0 PID: 6615 Comm: syz.4.107 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:txEnd+0xb4/0x530
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 9c 23 df 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 7d 23 df fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc900064d76c0 EFLAGS: 00010202
RAX: 00000000000000c7 RBX: ffffc90001d89020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8db9fa6b RDI: 00000000ffffffff
RBP: ffffc900064d7950 R08: ffffffff8fc35877 R09: 1ffffffff1f86b0e
R10: dffffc0000000000 R11: fffffbfff1f86b0f R12: ffff8881084de468
R13: dffffc0000000000 R14: ffffc90001d89000 R15: 0000000000000638
FS:  00007f4a2f4846c0(0000) GS:ffff8881a39fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8db8f056c0 CR3: 000000003b83c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 jfs_create+0x33e/0xa80
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4a2e58ec29
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:00007f4a2f484038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4a2e7d5fa0 RCX: 00007f4a2e58ec29
RDX: 0000000000107040 RSI: 0000200000000300 RDI: ffffffffffffff9c
RBP: 00007f4a2e611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001e7 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4a2e7d6038 R14: 00007f4a2e7d5fa0 R15: 00007ffec56e2578
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0xb4/0x530
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 9c 23 df 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 7d 23 df fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc900064d76c0 EFLAGS: 00010202
RAX: 00000000000000c7 RBX: ffffc90001d89020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8db9fa6b RDI: 00000000ffffffff
RBP: ffffc900064d7950 R08: ffffffff8fc35877 R09: 1ffffffff1f86b0e
R10: dffffc0000000000 R11: fffffbfff1f86b0f R12: ffff8881084de468
R13: dffffc0000000000 R14: ffffc90001d89000 R15: 0000000000000638
FS:  00007f4a2f4846c0(0000) GS:ffff8881a39fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8db8f056c0 CR3: 000000003b83c000 CR4: 00000000000006f0
