linux-kernel - Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_reserve_suballoc

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Message-ID: <672bf7db.050a0220.350062.0281.GAE@google.com>
Date: Wed, 06 Nov 2024 15:12:27 -0800
From: syzbot <syzbot+fd05de09d1267725aa95@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_reserve_suballoc_bits

syzbot has found a reproducer for the following issue on:

HEAD commit:    7758b206117d Merge tag 'tracefs-v6.12-rc6' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=100d76a7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=11254d3590b16717
dashboard link: https://syzkaller.appspot.com/bug?extid=fd05de09d1267725aa95
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=17984d87980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13745f40580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-7758b206.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2bb57fc511dd/vmlinux-7758b206.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b3cbc90748c2/bzImage-7758b206.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/6240dda90037/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/ee2f9e0a7c70/mount_8.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fd05de09d1267725aa95@...kaller.appspotmail.com

(syz-executor421,5309,0):ocfs2_prepare_inode_for_write:2273 ERROR: status = -30
(syz-executor421,5309,0):ocfs2_file_write_iter:2452 ERROR: status = -30
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:804!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5309 Comm: syz-executor421 Not tainted 6.12.0-rc6-syzkaller-00099-g7758b206117d #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:ocfs2_reserve_suballoc_bits+0x479b/0x4eb0 fs/ocfs2/suballoc.c:804
Code: e1 07 80 c1 03 38 c1 0f 8c 75 dd ff ff 48 8d bc 24 b0 01 00 00 e8 b5 b9 68 fe e9 63 dd ff ff e8 3b 4f 31 08 e8 e6 f2 fe fd 90 <0f> 0b e8 de f2 fe fd 48 c7 c7 20 ad e3 8e 48 8b 74 24 28 48 89 da
RSP: 0018:ffffc9000d0463c0 EFLAGS: 00010293
RAX: ffffffff8395e77a RBX: 00000000ffffffff RCX: ffff88801f0fc880
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000d0468b0 R08: ffffffff8395a255 R09: 1ffffffff203a11d
R10: dffffc0000000000 R11: fffffbfff203a11e R12: 1ffff92001a08cf8
R13: ffff888033156700 R14: ffff8880405a7e00 R15: dffffc0000000000
FS:  0000555588c64380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056114eea6000 CR3: 000000003a6b6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits+0xc5/0x1d0 fs/ocfs2/suballoc.c:1132
 ocfs2_local_alloc_reserve_for_window fs/ocfs2/localalloc.c:1125 [inline]
 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1261 [inline]
 ocfs2_reserve_local_alloc_bits+0x95e/0x2870 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1b8/0xb60 fs/ocfs2/suballoc.c:1166
 ocfs2_convert_inline_data_to_extents+0x29d/0x17f0 fs/ocfs2/alloc.c:7078
 ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1561 [inline]
 ocfs2_write_begin_nolock+0x1c7b/0x4ec0 fs/ocfs2/aops.c:1668
 ocfs2_write_begin+0x205/0x3a0 fs/ocfs2/aops.c:1902
 generic_perform_write+0x344/0x6d0 mm/filemap.c:4054
 ocfs2_file_write_iter+0x17b1/0x1f50 fs/ocfs2/file.c:2467
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 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: 0033:0x7f986bf8f1b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007fffaa60abc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000204e RCX: 00007f986bf8f1b9
RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007f986c00c610 R08: 000000000000000a R09: 00007fffaa60ad98
R10: 00000000fffffa00 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffaa60ad88 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x479b/0x4eb0 fs/ocfs2/suballoc.c:804
Code: e1 07 80 c1 03 38 c1 0f 8c 75 dd ff ff 48 8d bc 24 b0 01 00 00 e8 b5 b9 68 fe e9 63 dd ff ff e8 3b 4f 31 08 e8 e6 f2 fe fd 90 <0f> 0b e8 de f2 fe fd 48 c7 c7 20 ad e3 8e 48 8b 74 24 28 48 89 da
RSP: 0018:ffffc9000d0463c0 EFLAGS: 00010293
RAX: ffffffff8395e77a RBX: 00000000ffffffff RCX: ffff88801f0fc880
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000d0468b0 R08: ffffffff8395a255 R09: 1ffffffff203a11d
R10: dffffc0000000000 R11: fffffbfff203a11e R12: 1ffff92001a08cf8
R13: ffff888033156700 R14: ffff8880405a7e00 R15: dffffc0000000000
FS:  0000555588c64380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056114eea6000 CR3: 000000003a6b6000 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.