linux-kernel - Re: [syzbot] [gfs2?] kernel BUG in gfs2_assert_warn

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Message-ID: <66f91547.050a0220.aab67.0015.GAE@google.com>
Date: Sun, 29 Sep 2024 01:52:23 -0700
From: syzbot <syzbot+ffe01cefd437cbde362b@...kaller.appspotmail.com>
To: agruenba@...hat.com, gfs2@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gfs2?] kernel BUG in gfs2_assert_warn_i

syzbot has found a reproducer for the following issue on:

HEAD commit:    3efc57369a0c Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13b1de80580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4fcb065287cdb84
dashboard link: https://syzkaller.appspot.com/bug?extid=ffe01cefd437cbde362b
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1357f6a9980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1757f6a9980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-3efc5736.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d0988c372a39/vmlinux-3efc5736.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8547f30d7e9d/bzImage-3efc5736.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/ff644c356076/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ffe01cefd437cbde362b@...kaller.appspotmail.com

gfs2: fsid=syz:syz.0: Corruption found in quota_change0file: duplicate identifier in slot 82152
gfs2: fsid=syz:syz.0: warning: assertion "!qd->qd_change" failed - function = gfs2_qd_dispose, file = fs/gfs2/quota.c, line = 129
------------[ cut here ]------------
kernel BUG at fs/gfs2/util.c:414!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5093 Comm: syz-executor245 Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:gfs2_assert_warn_i+0x2df/0x2f0 fs/gfs2/util.c:414
Code: fe 48 c7 c7 00 03 50 8c 48 89 ee 48 8b 54 24 08 48 8b 4c 24 10 4c 8b 44 24 18 44 8b 4c 24 04 e8 97 8b d4 07 e8 32 53 a7 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90
RSP: 0018:ffffc90002c7f608 EFLAGS: 00010293
RAX: ffffffff83ed92ee RBX: 0000000000000004 RCX: ffff88801aac2440
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: ffff888011ff8000 R08: ffffffff83ed91a7 R09: 1ffff9200058fe5c
R10: dffffc0000000000 R11: fffff5200058fe5d R12: ffff888011ff82bc
R13: 00000000000003e8 R14: 1ffff110023ff057 R15: 0000000000002086
FS:  000055557cbb8380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc4c1c0e28 CR3: 000000003f704000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 gfs2_qd_dispose+0x4af/0x5b0 fs/gfs2/quota.c:129
 gfs2_quota_init+0xd7b/0x1440 fs/gfs2/quota.c:1470
 gfs2_make_fs_rw+0x43f/0x5e0 fs/gfs2/super.c:159
 gfs2_fill_super+0x22a1/0x24d0 fs/gfs2/ops_fstype.c:1274
 get_tree_bdev+0x3f7/0x570 fs/super.c:1635
 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f707505d16a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc87086d28 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc87086d40 RCX: 00007f707505d16a
RDX: 0000000020021140 RSI: 0000000020021180 RDI: 00007ffc87086d40
RBP: 0000000000000004 R08: 00007ffc87086d80 R09: 0000000000021197
R10: 000000000300c888 R11: 0000000000000282 R12: 000000000300c888
R13: 00007ffc87086d80 R14: 0000000000000003 R15: 0000000001000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:gfs2_assert_warn_i+0x2df/0x2f0 fs/gfs2/util.c:414
Code: fe 48 c7 c7 00 03 50 8c 48 89 ee 48 8b 54 24 08 48 8b 4c 24 10 4c 8b 44 24 18 44 8b 4c 24 04 e8 97 8b d4 07 e8 32 53 a7 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90
RSP: 0018:ffffc90002c7f608 EFLAGS: 00010293
RAX: ffffffff83ed92ee RBX: 0000000000000004 RCX: ffff88801aac2440
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: ffff888011ff8000 R08: ffffffff83ed91a7 R09: 1ffff9200058fe5c
R10: dffffc0000000000 R11: fffff5200058fe5d R12: ffff888011ff82bc
R13: 00000000000003e8 R14: 1ffff110023ff057 R15: 0000000000002086
FS:  000055557cbb8380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc4c1c0e28 CR3: 000000003f704000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.