* [syzbot] [f2fs?] general protection fault in f2fs_check_opt_consistency
@ 2025-08-16 3:18 syzbot
2025-08-17 3:34 ` Chao Yu
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2025-08-16 3:18 UTC (permalink / raw)
To: chao, jaegeuk, lihongbo22, linux-f2fs-devel, linux-kernel,
sandeen, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 0e39a731820a Merge tag 'for-6.17-rc1-tag' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13344da2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=13f39c6a0380a209
dashboard link: https://syzkaller.appspot.com/bug?extid=d371efea57d5aeab877b
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c22c34580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a125a2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e0297ec5b8e1/disk-0e39a731.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0396bfd57e65/vmlinux-0e39a731.xz
kernel image: https://storage.googleapis.com/syzbot-assets/68482d381f43/bzImage-0e39a731.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f909676ebee0/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=15344da2580000)
The issue was bisected to:
commit d185351325237da688de006a2c579e82ea97bdfe
Author: Hongbo Li <lihongbo22@huawei.com>
Date: Thu Jul 10 12:14:13 2025 +0000
f2fs: separate the options parsing and options checking
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137ca5a2580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=10fca5a2580000
console output: https://syzkaller.appspot.com/x/log.txt?x=177ca5a2580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d371efea57d5aeab877b@syzkaller.appspotmail.com
Fixes: d18535132523 ("f2fs: separate the options parsing and options checking")
F2FS-fs (loop0): f2fs_recover_fsync_data: recovery fsync data, check_only: 0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4
Oops: gen[ 107.736417][ T5848] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5848 Comm: syz-executor263 Tainted: G W 6.17.0-rc1-syzkaller-00014-g0e39a731820a #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
Code: 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 2c 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 33 42 0f b6 0c 36 40 38 cd 75 48 49 ff c6 40
RSP: 0018:ffffc90004adf8f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000021ec2c00 RSI: 0000000000000000 RDI: ffff888021ec2c80
RBP: 0000000000000066 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88803d2c9768 R11: ffffed1007a592fb R12: 1ffff1100611a891
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888021ec2c80
FS: 0000555575c20480(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000003d342000 CR4: 00000000003526f0
Call Trace:
<TASK>
f2fs_check_quota_consistency fs/f2fs/super.c:1188 [inline]
f2fs_check_opt_consistency+0x1378/0x2c10 fs/f2fs/super.c:1436
__f2fs_remount fs/f2fs/super.c:2653 [inline]
f2fs_reconfigure+0x482/0x1770 fs/f2fs/super.c:5297
reconfigure_super+0x224/0x890 fs/super.c:1077
do_remount fs/namespace.c:3314 [inline]
path_mount+0xd18/0xfe0 fs/namespace.c:4112
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f13267ca259
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007fff3d15d4a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f13267ca259
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000200000000140 R09: 00007fff3d15d4e0
R10: 0000000000000020 R11: 0000000000000246 R12: 00007fff3d15d4e0
R13: 00007fff3d15d768 R14: 431bde82d7b634db R15: 00007f132681303b
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
Code: 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 2c 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 33 42 0f b6 0c 36 40 38 cd 75 48 49 ff c6 40
RSP: 0018:ffffc90004adf8f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000021ec2c00 RSI: 0000000000000000 RDI: ffff888021ec2c80
RBP: 0000000000000066 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88803d2c9768 R11: ffffed1007a592fb R12: 1ffff1100611a891
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888021ec2c80
FS: 0000555575c20480(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000003d342000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 4 bytes skipped:
0: 45 31 f6 xor %r14d,%r14d
3: 4a 8d 04 37 lea (%rdi,%r14,1),%rax
7: 48 89 c1 mov %rax,%rcx
a: 48 c1 e9 03 shr $0x3,%rcx
e: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx
12: 84 c9 test %cl,%cl
14: 75 2c jne 0x42
16: 42 0f b6 2c 37 movzbl (%rdi,%r14,1),%ebp
1b: 4a 8d 04 36 lea (%rsi,%r14,1),%rax
1f: 48 89 c1 mov %rax,%rcx
22: 48 c1 e9 03 shr $0x3,%rcx
* 26: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx <-- trapping instruction
2a: 84 c9 test %cl,%cl
2c: 75 33 jne 0x61
2e: 42 0f b6 0c 36 movzbl (%rsi,%r14,1),%ecx
33: 40 38 cd cmp %cl,%bpl
36: 75 48 jne 0x80
38: 49 ff c6 inc %r14
3b: 40 rex
---
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@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [f2fs?] general protection fault in f2fs_check_opt_consistency
2025-08-16 3:18 [syzbot] [f2fs?] general protection fault in f2fs_check_opt_consistency syzbot
@ 2025-08-17 3:34 ` Chao Yu
2025-08-17 4:13 ` syzbot
0 siblings, 1 reply; 3+ messages in thread
From: Chao Yu @ 2025-08-17 3:34 UTC (permalink / raw)
To: syzbot, jaegeuk, lihongbo22, linux-f2fs-devel, linux-kernel,
sandeen, syzkaller-bugs
Cc: chao
#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot
On 2025/8/16 11:18, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 0e39a731820a Merge tag 'for-6.17-rc1-tag' of git://git.ker..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=13344da2580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=13f39c6a0380a209
> dashboard link: https://syzkaller.appspot.com/bug?extid=d371efea57d5aeab877b
> compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c22c34580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a125a2580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/e0297ec5b8e1/disk-0e39a731.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/0396bfd57e65/vmlinux-0e39a731.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/68482d381f43/bzImage-0e39a731.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/f909676ebee0/mount_0.gz
> fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=15344da2580000)
>
> The issue was bisected to:
>
> commit d185351325237da688de006a2c579e82ea97bdfe
> Author: Hongbo Li <lihongbo22@huawei.com>
> Date: Thu Jul 10 12:14:13 2025 +0000
>
> f2fs: separate the options parsing and options checking
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137ca5a2580000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=10fca5a2580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=177ca5a2580000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d371efea57d5aeab877b@syzkaller.appspotmail.com
> Fixes: d18535132523 ("f2fs: separate the options parsing and options checking")
>
> F2FS-fs (loop0): f2fs_recover_fsync_data: recovery fsync data, check_only: 0
> F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4
> Oops: gen[ 107.736417][ T5848] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 1 UID: 0 PID: 5848 Comm: syz-executor263 Tainted: G W 6.17.0-rc1-syzkaller-00014-g0e39a731820a #0 PREEMPT_{RT,(full)}
> Tainted: [W]=WARN
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
> RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
> Code: 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 2c 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 33 42 0f b6 0c 36 40 38 cd 75 48 49 ff c6 40
> RSP: 0018:ffffc90004adf8f8 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
> RDX: 0000000021ec2c00 RSI: 0000000000000000 RDI: ffff888021ec2c80
> RBP: 0000000000000066 R08: 0000000000000000 R09: 0000000000000000
> R10: ffff88803d2c9768 R11: ffffed1007a592fb R12: 1ffff1100611a891
> R13: 0000000000000000 R14: 0000000000000000 R15: ffff888021ec2c80
> FS: 0000555575c20480(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000200000001000 CR3: 000000003d342000 CR4: 00000000003526f0
> Call Trace:
> <TASK>
> f2fs_check_quota_consistency fs/f2fs/super.c:1188 [inline]
> f2fs_check_opt_consistency+0x1378/0x2c10 fs/f2fs/super.c:1436
> __f2fs_remount fs/f2fs/super.c:2653 [inline]
> f2fs_reconfigure+0x482/0x1770 fs/f2fs/super.c:5297
> reconfigure_super+0x224/0x890 fs/super.c:1077
> do_remount fs/namespace.c:3314 [inline]
> path_mount+0xd18/0xfe0 fs/namespace.c:4112
> do_mount fs/namespace.c:4133 [inline]
> __do_sys_mount fs/namespace.c:4344 [inline]
> __se_sys_mount+0x317/0x410 fs/namespace.c:4321
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f13267ca259
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007fff3d15d4a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f13267ca259
> RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
> RBP: 0000000000000000 R08: 0000200000000140 R09: 00007fff3d15d4e0
> R10: 0000000000000020 R11: 0000000000000246 R12: 00007fff3d15d4e0
> R13: 00007fff3d15d768 R14: 431bde82d7b634db R15: 00007f132681303b
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
> Code: 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 2c 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 33 42 0f b6 0c 36 40 38 cd 75 48 49 ff c6 40
> RSP: 0018:ffffc90004adf8f8 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
> RDX: 0000000021ec2c00 RSI: 0000000000000000 RDI: ffff888021ec2c80
> RBP: 0000000000000066 R08: 0000000000000000 R09: 0000000000000000
> R10: ffff88803d2c9768 R11: ffffed1007a592fb R12: 1ffff1100611a891
> R13: 0000000000000000 R14: 0000000000000000 R15: ffff888021ec2c80
> FS: 0000555575c20480(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 000000003d342000 CR4: 00000000003526f0
> ----------------
> Code disassembly (best guess), 4 bytes skipped:
> 0: 45 31 f6 xor %r14d,%r14d
> 3: 4a 8d 04 37 lea (%rdi,%r14,1),%rax
> 7: 48 89 c1 mov %rax,%rcx
> a: 48 c1 e9 03 shr $0x3,%rcx
> e: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx
> 12: 84 c9 test %cl,%cl
> 14: 75 2c jne 0x42
> 16: 42 0f b6 2c 37 movzbl (%rdi,%r14,1),%ebp
> 1b: 4a 8d 04 36 lea (%rsi,%r14,1),%rax
> 1f: 48 89 c1 mov %rax,%rcx
> 22: 48 c1 e9 03 shr $0x3,%rcx
> * 26: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx <-- trapping instruction
> 2a: 84 c9 test %cl,%cl
> 2c: 75 33 jne 0x61
> 2e: 42 0f b6 0c 36 movzbl (%rsi,%r14,1),%ecx
> 33: 40 38 cd cmp %cl,%bpl
> 36: 75 48 jne 0x80
> 38: 49 ff c6 inc %r14
> 3b: 40 rex
>
>
> ---
> 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@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> 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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [f2fs?] general protection fault in f2fs_check_opt_consistency
2025-08-17 3:34 ` Chao Yu
@ 2025-08-17 4:13 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2025-08-17 4:13 UTC (permalink / raw)
To: chao, jaegeuk, lihongbo22, linux-f2fs-devel, linux-kernel,
sandeen, syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+d371efea57d5aeab877b@syzkaller.appspotmail.com
Tested-by: syzbot+d371efea57d5aeab877b@syzkaller.appspotmail.com
Tested on:
commit: b3b0143b f2fs: fix to avoid NULL pointer dereference i..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot
console output: https://syzkaller.appspot.com/x/log.txt?x=108473a2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=13f39c6a0380a209
dashboard link: https://syzkaller.appspot.com/bug?extid=d371efea57d5aeab877b
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2025-08-17 4:13 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2025-08-16 3:18 [syzbot] [f2fs?] general protection fault in f2fs_check_opt_consistency syzbot
2025-08-17 3:34 ` Chao Yu
2025-08-17 4:13 ` syzbot
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