[syzbot] [jfs?] [fat?] general protection fault in txEnd

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: aeba12b26c79 Merge tag 'nfsd-6.2-1' of git://git.kernel.or..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17485bf0480000
kernel config: https://syzkaller.appspot.com/x/.config?x=4d348fc1e0f483c9
dashboard link: https://syzkaller.appspot.com/bug?extid=1d096d31de6a0491b55e
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117aef10480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15206090480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/661fe33f851b/disk-aeba12b2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c938bdcf3ad0/vmlinux-aeba12b2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e7f738de30b7/bzImage-aeba12b2.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/9ee3cffc6151/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d096d...@syzkaller.appspotmail.com

ERROR: (device loop0): remounting filesystem as read-only
general protection fault, probably for non-canonical address 0xdffffc0000000029: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000148-0x000000000000014f]
CPU: 1 PID: 5116 Comm: syz-executor317 Not tainted 6.1.0-syzkaller-13781-gaeba12b26c79 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:txEnd+0x1dc/0x560 fs/jfs/jfs_txnmgr.c:534
Code: 00 84 c0 0f 85 d8 02 00 00 66 41 89 1e 41 0f b7 c5 89 05 e7 5c 0b 0f 4c 8b 74 24 08 49 8d 9e 4c 01 00 00 48 89 d8 48 c1 e8 03 <42> 8a 04 20 84 c0 0f 85 c8 02 00 00 8b 2b 8d 75 ff 89 33 31 ff e8
RSP: 0018:ffffc90003d5f9f0 EFLAGS: 00010203
RAX: 0000000000000029 RBX: 000000000000014c RCX: 0000000000000000
RDX: ffff88807eb93a80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff920004c6227 R08: ffffffff830c3c2f R09: fffffbfff20fb43a
R10: fffffbfff20fb43a R11: 1ffffffff20fb439 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000110
FS: 00007f2738801700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f273fc23000 CR3: 000000007e7a4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
add_missing_indices fs/jfs/jfs_dtree.c:2658 [inline]
jfs_readdir+0x277c/0x44b0 fs/jfs/jfs_dtree.c:3004
iterate_dir+0x257/0x5f0
__do_sys_getdents fs/readdir.c:286 [inline]
__se_sys_getdents+0x1db/0x4d0 fs/readdir.c:271
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f273fc76709
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f27388012f8 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f273fd017b0 RCX: 00007f273fc76709
RDX: 000000000000004c RSI: 0000000020000100 RDI: 0000000000000004
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 61746f7571727375
R13: 726765746e696f6e R14: 7261637369646f6e R15: 00007f273fd017b8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x1dc/0x560 fs/jfs/jfs_txnmgr.c:534
Code: 00 84 c0 0f 85 d8 02 00 00 66 41 89 1e 41 0f b7 c5 89 05 e7 5c 0b 0f 4c 8b 74 24 08 49 8d 9e 4c 01 00 00 48 89 d8 48 c1 e8 03 <42> 8a 04 20 84 c0 0f 85 c8 02 00 00 8b 2b 8d 75 ff 89 33 31 ff e8
RSP: 0018:ffffc90003d5f9f0 EFLAGS: 00010203
RAX: 0000000000000029 RBX: 000000000000014c RCX: 0000000000000000
RDX: ffff88807eb93a80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff920004c6227 R08: ffffffff830c3c2f R09: fffffbfff20fb43a
R10: fffffbfff20fb43a R11: 1ffffffff20fb439 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000110
FS: 00007f2738801700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f273fc23000 CR3: 000000007e7a4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 84 c0 0f 85 d8 02 add %al,0x2d8850f(%rax,%rax,8)
7: 00 00 add %al,(%rax)
9: 66 41 89 1e mov %bx,(%r14)
d: 41 0f b7 c5 movzwl %r13w,%eax
11: 89 05 e7 5c 0b 0f mov %eax,0xf0b5ce7(%rip) # 0xf0b5cfe
17: 4c 8b 74 24 08 mov 0x8(%rsp),%r14
1c: 49 8d 9e 4c 01 00 00 lea 0x14c(%r14),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 8a 04 20 mov (%rax,%r12,1),%al <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 c8 02 00 00 jne 0x2fe
36: 8b 2b mov (%rbx),%ebp
38: 8d 75 ff lea -0x1(%rbp),%esi
3b: 89 33 mov %esi,(%rbx)
3d: 31 ff xor %edi,%edi
3f: e8 .byte 0xe8


---
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[Aleksandr Nogikh]

#syz set subsystems: jfs

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[syzbot]

> #syz set subsystems: jfs

Thank you!

I've successfully updated the bug's subsystems.