[syzbot] [gfs2?] kernel BUG in qd_put

From: syzbot
Date: Sun Sep 10 2023 - 03:54:12 EST

Hello,

syzbot found the following issue on:

HEAD commit: 65d6e954e378 Merge tag 'gfs2-v6.5-rc5-fixes' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1294ea14680000
kernel config: https://syzkaller.appspot.com/x/.config?x=b273cdfbc13e9a4b
dashboard link: https://syzkaller.appspot.com/bug?extid=ac749796740f1d4348bc
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-65d6e954.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cdf5375ab649/vmlinux-65d6e954.xz
kernel image: https://storage.googleapis.com/syzbot-assets/302d058f1d48/bzImage-65d6e954.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac749796740f1d4348bc@xxxxxxxxxxxxxxxxxxxxxxxxx

kernel BUG at fs/gfs2/quota.c:323!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5188 Comm: syz-executor.2 Not tainted 6.5.0-syzkaller-11938-g65d6e954e378 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:qd_put+0x132/0x190 fs/gfs2/quota.c:323
Code: c7 43 70 00 00 00 00 48 8d 73 78 e8 48 7e 1e fe 4c 89 e7 e8 f0 24 9a 06 5b 5d 41 5c 41 5d 41 5e e9 c3 ef e0 fd e8 be ef e0 fd <0f> 0b e8 b7 ef e0 fd 4c 89 e7 e8 cf 07 7a 00 4c 89 e7 e8 c7 24 9a
RSP: 0018:ffffc90004017c30 EFLAGS: 00010293

RAX: 0000000000000000 RBX: ffff8880269c23f0 RCX: 0000000000000000
RDX: ffff8880164fc800 RSI: ffffffff83a6b442 RDI: 0000000000000005
RBP: 00000000ffffff80 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffff80 R11: 0000000000000000 R12: ffff8880269c2420
R13: ffff8880269c2460 R14: ffff8880276aca68 R15: ffff88802441f008
FS: 0000000000000000(0000) GS:ffff88802c600000(0063) knlGS:000000005771d400
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7268bb0 CR3: 0000000076871000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
gfs2_quota_sync+0x44b/0x630 fs/gfs2/quota.c:1350
gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:667
sync_filesystem fs/sync.c:56 [inline]
sync_filesystem+0x109/0x280 fs/sync.c:30
generic_shutdown_super+0x7e/0x3c0 fs/super.c:666
kill_block_super+0x3b/0x70 fs/super.c:1646
gfs2_kill_sb+0x361/0x410 fs/gfs2/ops_fstype.c:1811
deactivate_locked_super+0x9a/0x170 fs/super.c:481
deactivate_super+0xde/0x100 fs/super.c:514
cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254
task_work_run+0x14d/0x240 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296
__do_fast_syscall_32+0x6d/0xe0 arch/x86/entry/common.c:181
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7fe8579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffd6aa88 EFLAGS: 00000292 ORIG_RAX: 0000000000000034
RAX: 0000000000000000 RBX: 00000000ffd6ab30 RCX: 000000000000000a
RDX: 00000000f7353ff4 RSI: 00000000f72a53bd RDI: 00000000ffd6bbd4
RBP: 00000000ffd6ab30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qd_put+0x132/0x190 fs/gfs2/quota.c:323
Code: c7 43 70 00 00 00 00 48 8d 73 78 e8 48 7e 1e fe 4c 89 e7 e8 f0 24 9a 06 5b 5d 41 5c 41 5d 41 5e e9 c3 ef e0 fd e8 be ef e0 fd <0f> 0b e8 b7 ef e0 fd 4c 89 e7 e8 cf 07 7a 00 4c 89 e7 e8 c7 24 9a
RSP: 0018:ffffc90004017c30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880269c23f0 RCX: 0000000000000000
RDX: ffff8880164fc800 RSI: ffffffff83a6b442 RDI: 0000000000000005
RBP: 00000000ffffff80 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffff80 R11: 0000000000000000 R12: ffff8880269c2420
R13: ffff8880269c2460 R14: ffff8880276aca68 R15: ffff88802441f008
FS: 0000000000000000(0000) GS:ffff88802c600000(0063) knlGS:000000005771d400
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7268bb0 CR3: 0000000076871000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi


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