Re: [syzbot] [f2fs?] kernel BUG in new_curseg
From: Chao Yu
Date: Mon Sep 09 2024 - 10:03:13 EST
#syz test git://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git wip
On 2024/9/9 16:19, syzbot wrote:
Hello,
syzbot found the following issue on:
HEAD commit: 89f5e14d05b4 Merge tag 'timers_urgent_for_v6.11_rc7' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14085f29980000
kernel config: https://syzkaller.appspot.com/x/.config?x=58a85aa6925a8b78
dashboard link: https://syzkaller.appspot.com/bug?extid=341e5f32ebafbb46b81c
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=1614c807980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13854e00580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-89f5e14d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dfc310daee41/vmlinux-89f5e14d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a92f22c06568/bzImage-89f5e14d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/c7aaf1741c93/mount_1.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+341e5f32ebafbb46b81c@xxxxxxxxxxxxxxxxxxxxxxxxx
F2FS-fs (loop0): inject no free segment in get_new_segment of __allocate_new_segment+0x1ce/0x940 fs/f2fs/segment.c:3167
F2FS-fs (loop0): Stopped filesystem due to reason: 7
------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.c:2748!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5109 Comm: syz-executor304 Not tainted 6.11.0-rc6-syzkaller-00363-g89f5e14d05b4 #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:get_new_segment fs/f2fs/segment.c:2748 [inline]
RIP: 0010:new_curseg+0x1f61/0x1f70 fs/f2fs/segment.c:2836
Code: 24 58 e8 12 b9 f2 ff eb 05 e8 4b 71 96 fd 48 8b 7c 24 70 e8 91 ac c6 07 48 8b 7c 24 10 31 f6 ba 07 00 00 00 e8 50 1e f6 ff 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000179f548 EFLAGS: 00010246
RAX: 8fb07c62f860e300 RBX: 00000000000002b2 RCX: 8fb07c62f860e300
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff8880125250c8 R08: ffffffff817401bc R09: 1ffff920002f3e20
R10: dffffc0000000000 R11: fffff520002f3e21 R12: ffff8880008c2700
R13: ffff8880125250cc R14: 1ffff110024a4a19 R15: 00000000000002b2
FS: 0000555593e0e380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cf8cb40f8 CR3: 000000001255a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__allocate_new_segment+0x1ce/0x940 fs/f2fs/segment.c:3167
f2fs_allocate_new_section fs/f2fs/segment.c:3181 [inline]
f2fs_allocate_pinning_section+0xfa/0x4e0 fs/f2fs/segment.c:3195
f2fs_expand_inode_data+0x5d6/0xbb0 fs/f2fs/file.c:1799
f2fs_fallocate+0x448/0x960 fs/f2fs/file.c:1903
vfs_fallocate+0x553/0x6c0 fs/open.c:334
do_vfs_ioctl+0x2592/0x2e50 fs/ioctl.c:886
__do_sys_ioctl fs/ioctl.c:905 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
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: 0033:0x7f6cf8c37229
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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:00007ffeb5036b58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f6cf8c37229
RDX: 00000000200000c0 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007ffeb5036b90 R09: 00007ffeb5036b90
R10: 00007ffeb5036b90 R11: 0000000000000246 R12: 00007ffeb5036b7c
R13: 0000000000000002 R14: 431bde82d7b634db R15: 00007ffeb5036bb0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:get_new_segment fs/f2fs/segment.c:2748 [inline]
RIP: 0010:new_curseg+0x1f61/0x1f70 fs/f2fs/segment.c:2836
Code: 24 58 e8 12 b9 f2 ff eb 05 e8 4b 71 96 fd 48 8b 7c 24 70 e8 91 ac c6 07 48 8b 7c 24 10 31 f6 ba 07 00 00 00 e8 50 1e f6 ff 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000179f548 EFLAGS: 00010246
RAX: 8fb07c62f860e300 RBX: 00000000000002b2 RCX: 8fb07c62f860e300
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff8880125250c8 R08: ffffffff817401bc R09: 1ffff920002f3e20
R10: dffffc0000000000 R11: fffff520002f3e21 R12: ffff8880008c2700
R13: ffff8880125250cc R14: 1ffff110024a4a19 R15: 00000000000002b2
FS: 0000555593e0e380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cf8cb40f8 CR3: 000000001255a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
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.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup