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
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000c5: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000628-0x000000000000062f]
CPU: 0 UID: 0 PID: 5615 Comm: syz-executor 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 fc 6a ce fe 41 bf 28 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 dd 6a ce fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc90004ce7bc0 EFLAGS: 00010206
RAX: 00000000000000c5 RBX: ffffc900029d9020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8dfa9085 RDI: 00000000ffffffff
RBP: ffffc90004ce7d40 R08: ffffffff9030b1f7 R09: 1ffffffff206163e
R10: dffffc0000000000 R11: fffffbfff206163f R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc900029d9000 R15: 0000000000000628
FS:  000055557ae78500(0000) GS:ffff88818dc96000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb746c15fac CR3: 00000000216ea000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 jfs_unlink+0x561/0x9f0
 vfs_unlink+0x272/0x6c0
 filename_unlinkat+0x3cd/0x610
 __se_sys_unlink+0x2e/0x140
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb74699bec7
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdc1e0dc98 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb74699bec7
RDX: 00007ffdc1e0dcc0 RSI: 00007ffdc1e0dd50 RDI: 00007ffdc1e0dd50
RBP: 00007ffdc1e0dd50 R08: 00007ffdc1e0ed50 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdc1e0ee40
R13: 00007fb746a32120 R14: 00000000000140f2 R15: 00007ffdc1e0ff10
 </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 fc 6a ce fe 41 bf 28 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 dd 6a ce fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc90004ce7bc0 EFLAGS: 00010206
RAX: 00000000000000c5 RBX: ffffc900029d9020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8dfa9085 RDI: 00000000ffffffff
RBP: ffffc90004ce7d40 R08: ffffffff9030b1f7 R09: 1ffffffff206163e
R10: dffffc0000000000 R11: fffffbfff206163f R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc900029d9000 R15: 0000000000000628
FS:  000055557ae78500(0000) GS:ffff88818dc96000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb746c15fac CR3: 00000000216ea000 CR4: 00000000000006f0
