linux-kernel - Re: [syzbot] [nfs?] WARNING in nsfs_fh_to

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Message-ID: <68cf5f6a.050a0220.13cd81.0027.GAE@google.com>
Date: Sat, 20 Sep 2025 19:14:02 -0700
From: syzbot <syzbot+9eefe09bedd093f156c2@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-ext4@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nfs?] WARNING in nsfs_fh_to_dentry

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in nsfs_fh_to_dentry

------------[ cut here ]------------
WARNING: fs/nsfs.c:502 at nsfs_fh_to_dentry+0xcde/0xe00 fs/nsfs.c:502, CPU#0: syz.0.17/6525
Modules linked in:
CPU: 0 UID: 0 PID: 6525 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:nsfs_fh_to_dentry+0xcde/0xe00 fs/nsfs.c:502
Code: 5c 24 60 e9 08 f8 ff ff e8 2f 01 79 ff 90 0f 0b 90 e9 72 f6 ff ff e8 21 01 79 ff 90 0f 0b 90 e9 da f6 ff ff e8 13 01 79 ff 90 <0f> 0b 90 e9 1a f7 ff ff e8 c5 88 46 09 e8 00 01 79 ff 31 db e9 cd
RSP: 0018:ffffc90003007a20 EFLAGS: 00010293
RAX: ffffffff8247180d RBX: 00000000effffffd RCX: ffff88801bba5ac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000effffffd
RBP: ffffc90003007b10 R08: ffffffff8fe4db77 R09: 1ffffffff1fc9b6e
R10: dffffc0000000000 R11: fffffbfff1fc9b6f R12: dffffc0000000000
R13: ffff888027365694 R14: ffffffff8e3df738 R15: 0000000000000000
FS:  00007f46068b46c0(0000) GS:ffff8881257a2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30363fff CR3: 00000000706b4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 exportfs_decode_fh_raw+0x178/0x6e0 fs/exportfs/expfs.c:456
 do_handle_to_path+0xa4/0x1a0 fs/fhandle.c:276
 handle_to_path fs/fhandle.c:400 [inline]
 do_handle_open+0x6b4/0x8f0 fs/fhandle.c:415
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f460598ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f46068b4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007f4605bd5fa0 RCX: 00007f460598ec29
RDX: 0000000000400040 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f4605a11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4605bd6038 R14: 00007f4605bd5fa0 R15: 00007ffed9ea2cf8
 </TASK>


Tested on:

commit:         846bd222 Add linux-next specific files for 20250919
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10ef70e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=135377594f35b576
dashboard link: https://syzkaller.appspot.com/bug?extid=9eefe09bedd093f156c2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10e888e2580000