* [moderation/CI] Re: fuse: compound commands
@ 2025-12-23 16:14 syzbot ci
2025-12-23 17:45 ` Aleksandr Nogikh
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2025-12-23 16:14 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v1] fuse: compound commands
https://lore.kernel.org/all/20251223-fuse-compounds-upstream-v1-0-7bade663947b@ddn.com
* [PATCH RFC 1/2] fuse: add compound command to combine multiple requests
* [PATCH RFC 2/2] fuse: add an implementation of open+getattr
and found the following issue:
general protection fault in fuse_dir_open
Full report is available here:
https://ci.syzbot.org/series/11a1edb1-479b-4bb9-a173-a5aef4cc9455
***
general protection fault in fuse_dir_open
tree: torvalds
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
base: 9094662f6707d1d4b53d18baba459604e8bb0783
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/0d046766-2385-4f04-bae0-5a8d6df01c3a/config
C repro: https://ci.syzbot.org/findings/027737d8-b067-4bd4-90f6-5b236fb8420b/c_repro
syz repro: https://ci.syzbot.org/findings/027737d8-b067-4bd4-90f6-5b236fb8420b/syz_repro
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 1 UID: 0 PID: 5985 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:fuse_dir_open+0x14e/0x220 fs/fuse/dir.c:1900
Code: eb a7 4d 8d 7e 58 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e0 77 f3 fe 4d 8b 3f 49 83 c7 2c 4d 89 fc 49 c1 ec 03 <43> 0f b6 04 2c 84 c0 0f 85 82 00 00 00 41 8b 2f 89 ee 83 e6 14 31
RSP: 0018:ffffc90003907860 EFLAGS: 00010203
RAX: 1ffff11022f0688b RBX: ffff8881b9320000 RCX: 0000000000000000
RDX: ffff88810afbba80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8f822b77 R09: 1ffffffff1f0456e
R10: dffffc0000000000 R11: fffffbfff1f0456f R12: 000000000000000b
R13: dffffc0000000000 R14: ffff888117834400 R15: 000000000000005c
FS: 00007fa1fc9506c0(0000) GS:ffff8882a9e1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1fb1fdfc8 CR3: 000000016abde000 CR4: 00000000000006f0
Call Trace:
<TASK>
do_dentry_open+0x7ce/0x1420 fs/open.c:962
vfs_open+0x3b/0x340 fs/open.c:1094
do_open fs/namei.c:4628 [inline]
path_openat+0x340e/0x3dd0 fs/namei.c:4787
do_filp_open+0x1fa/0x410 fs/namei.c:4814
do_sys_openat2+0x121/0x200 fs/open.c:1430
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1447
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa1fbb8e010
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 69 95 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 bc 95 02 00 8b 44
RSP: 002b:00007fa1fc94fdf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007fa1fbb8e010
RDX: 0000000000010000 RSI: 00002000000000c0 RDI: 00000000ffffff9c
RBP: 00002000000000c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00002000000000c0
R13: 00007fa1fc94feb0 R14: 0000000000000000 R15: 0000200000002280
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fuse_dir_open+0x14e/0x220 fs/fuse/dir.c:1900
Code: eb a7 4d 8d 7e 58 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e0 77 f3 fe 4d 8b 3f 49 83 c7 2c 4d 89 fc 49 c1 ec 03 <43> 0f b6 04 2c 84 c0 0f 85 82 00 00 00 41 8b 2f 89 ee 83 e6 14 31
RSP: 0018:ffffc90003907860 EFLAGS: 00010203
RAX: 1ffff11022f0688b RBX: ffff8881b9320000 RCX: 0000000000000000
RDX: ffff88810afbba80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8f822b77 R09: 1ffffffff1f0456e
R10: dffffc0000000000 R11: fffffbfff1f0456f R12: 000000000000000b
R13: dffffc0000000000 R14: ffff888117834400 R15: 000000000000005c
FS: 00007fa1fc9506c0(0000) GS:ffff8882a9e1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1fb1fdfc8 CR3: 000000016abde000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: eb a7 jmp 0xffffffa9
2: 4d 8d 7e 58 lea 0x58(%r14),%r15
6: 4c 89 f8 mov %r15,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
12: 74 08 je 0x1c
14: 4c 89 ff mov %r15,%rdi
17: e8 e0 77 f3 fe call 0xfef377fc
1c: 4d 8b 3f mov (%r15),%r15
1f: 49 83 c7 2c add $0x2c,%r15
23: 4d 89 fc mov %r15,%r12
26: 49 c1 ec 03 shr $0x3,%r12
* 2a: 43 0f b6 04 2c movzbl (%r12,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 82 00 00 00 jne 0xb9
37: 41 8b 2f mov (%r15),%ebp
3a: 89 ee mov %ebp,%esi
3c: 83 e6 14 and $0x14,%esi
3f: 31 .byte 0x31
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
The email will later be sent to:
[bschubert@ddn.com hbirthelmer@ddn.com hbirthelmer@googlemail.com linux-fsdevel@vger.kernel.org linux-kernel@vger.kernel.org miklos@szeredi.hu]
If the report looks fine to you, reply with:
#syz upstream
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: fuse: compound commands
2025-12-23 16:14 [moderation/CI] Re: fuse: compound commands syzbot ci
@ 2025-12-23 17:45 ` Aleksandr Nogikh
0 siblings, 0 replies; 2+ messages in thread
From: Aleksandr Nogikh @ 2025-12-23 17:45 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Tue, Dec 23, 2025 at 5:14 PM syzbot ci
<syzbot+ci71c667420ed312f3@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v1] fuse: compound commands
> https://lore.kernel.org/all/20251223-fuse-compounds-upstream-v1-0-7bade663947b@ddn.com
> * [PATCH RFC 1/2] fuse: add compound command to combine multiple requests
> * [PATCH RFC 2/2] fuse: add an implementation of open+getattr
>
> and found the following issue:
> general protection fault in fuse_dir_open
>
> Full report is available here:
> https://ci.syzbot.org/series/11a1edb1-479b-4bb9-a173-a5aef4cc9455
>
> ***
>
> general protection fault in fuse_dir_open
>
> tree: torvalds
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base: 9094662f6707d1d4b53d18baba459604e8bb0783
> arch: amd64
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> config: https://ci.syzbot.org/builds/0d046766-2385-4f04-bae0-5a8d6df01c3a/config
> C repro: https://ci.syzbot.org/findings/027737d8-b067-4bd4-90f6-5b236fb8420b/c_repro
> syz repro: https://ci.syzbot.org/findings/027737d8-b067-4bd4-90f6-5b236fb8420b/syz_repro
>
> Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
> CPU: 1 UID: 0 PID: 5985 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:fuse_dir_open+0x14e/0x220 fs/fuse/dir.c:1900
> Code: eb a7 4d 8d 7e 58 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e0 77 f3 fe 4d 8b 3f 49 83 c7 2c 4d 89 fc 49 c1 ec 03 <43> 0f b6 04 2c 84 c0 0f 85 82 00 00 00 41 8b 2f 89 ee 83 e6 14 31
> RSP: 0018:ffffc90003907860 EFLAGS: 00010203
> RAX: 1ffff11022f0688b RBX: ffff8881b9320000 RCX: 0000000000000000
> RDX: ffff88810afbba80 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: ffffffff8f822b77 R09: 1ffffffff1f0456e
> R10: dffffc0000000000 R11: fffffbfff1f0456f R12: 000000000000000b
> R13: dffffc0000000000 R14: ffff888117834400 R15: 000000000000005c
> FS: 00007fa1fc9506c0(0000) GS:ffff8882a9e1f000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fa1fb1fdfc8 CR3: 000000016abde000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> do_dentry_open+0x7ce/0x1420 fs/open.c:962
> vfs_open+0x3b/0x340 fs/open.c:1094
> do_open fs/namei.c:4628 [inline]
> path_openat+0x340e/0x3dd0 fs/namei.c:4787
> do_filp_open+0x1fa/0x410 fs/namei.c:4814
> do_sys_openat2+0x121/0x200 fs/open.c:1430
> do_sys_open fs/open.c:1436 [inline]
> __do_sys_openat fs/open.c:1452 [inline]
> __se_sys_openat fs/open.c:1447 [inline]
> __x64_sys_openat+0x138/0x170 fs/open.c:1447
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fa1fbb8e010
> Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 69 95 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 bc 95 02 00 8b 44
> RSP: 002b:00007fa1fc94fdf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
> RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007fa1fbb8e010
> RDX: 0000000000010000 RSI: 00002000000000c0 RDI: 00000000ffffff9c
> RBP: 00002000000000c0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000293 R12: 00002000000000c0
> R13: 00007fa1fc94feb0 R14: 0000000000000000 R15: 0000200000002280
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:fuse_dir_open+0x14e/0x220 fs/fuse/dir.c:1900
> Code: eb a7 4d 8d 7e 58 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e0 77 f3 fe 4d 8b 3f 49 83 c7 2c 4d 89 fc 49 c1 ec 03 <43> 0f b6 04 2c 84 c0 0f 85 82 00 00 00 41 8b 2f 89 ee 83 e6 14 31
> RSP: 0018:ffffc90003907860 EFLAGS: 00010203
> RAX: 1ffff11022f0688b RBX: ffff8881b9320000 RCX: 0000000000000000
> RDX: ffff88810afbba80 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: ffffffff8f822b77 R09: 1ffffffff1f0456e
> R10: dffffc0000000000 R11: fffffbfff1f0456f R12: 000000000000000b
> R13: dffffc0000000000 R14: ffff888117834400 R15: 000000000000005c
> FS: 00007fa1fc9506c0(0000) GS:ffff8882a9e1f000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fa1fb1fdfc8 CR3: 000000016abde000 CR4: 00000000000006f0
> ----------------
> Code disassembly (best guess):
> 0: eb a7 jmp 0xffffffa9
> 2: 4d 8d 7e 58 lea 0x58(%r14),%r15
> 6: 4c 89 f8 mov %r15,%rax
> 9: 48 c1 e8 03 shr $0x3,%rax
> d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
> 12: 74 08 je 0x1c
> 14: 4c 89 ff mov %r15,%rdi
> 17: e8 e0 77 f3 fe call 0xfef377fc
> 1c: 4d 8b 3f mov (%r15),%r15
> 1f: 49 83 c7 2c add $0x2c,%r15
> 23: 4d 89 fc mov %r15,%r12
> 26: 49 c1 ec 03 shr $0x3,%r12
> * 2a: 43 0f b6 04 2c movzbl (%r12,%r13,1),%eax <-- trapping instruction
> 2f: 84 c0 test %al,%al
> 31: 0f 85 82 00 00 00 jne 0xb9
> 37: 41 8b 2f mov (%r15),%ebp
> 3a: 89 ee mov %ebp,%esi
> 3c: 83 e6 14 and $0x14,%esi
> 3f: 31 .byte 0x31
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> The email will later be sent to:
> [bschubert@ddn.com hbirthelmer@ddn.com hbirthelmer@googlemail.com linux-fsdevel@vger.kernel.org linux-kernel@vger.kernel.org miklos@szeredi.hu]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> --
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2025-12-23 16:14 [moderation/CI] Re: fuse: compound commands syzbot ci
2025-12-23 17:45 ` Aleksandr Nogikh
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