linux-kernel - Re: [syzbot] WARNING in do

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Message-ID: <00000000000025ff8d05ef842be6@google.com>
Date:   Sat, 10 Dec 2022 18:30:22 -0800
From:   syzbot <syzbot+919c5a9be8433b8bf201@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in do_mkdirat

Hello,

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

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88807217f1d0, owner = 0x0, curr 0xffff88807ce13a80, list empty
WARNING: CPU: 0 PID: 4220 at kernel/locking/rwsem.c:1361 __up_write kernel/locking/rwsem.c:1360 [inline]
WARNING: CPU: 0 PID: 4220 at kernel/locking/rwsem.c:1361 up_write+0x4f9/0x580 kernel/locking/rwsem.c:1615
Modules linked in:
CPU: 0 PID: 4220 Comm: syz-executor.0 Not tainted 6.1.0-rc8-syzkaller-00152-g3ecc37918c80-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__up_write kernel/locking/rwsem.c:1360 [inline]
RIP: 0010:up_write+0x4f9/0x580 kernel/locking/rwsem.c:1615
Code: c7 c0 a3 ed 8a 48 c7 c6 60 a6 ed 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 31 c0 53 e8 ab 7c e8 ff 48 83 c4 08 <0f> 0b e9 6b fd ff ff 48 c7 c1 58 4d 76 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90006d9fd20 EFLAGS: 00010292
RAX: 41e4cc6daa410d00 RBX: ffffffff8aeda4a0 RCX: ffff88807ce13a80
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90006d9fdf8 R08: ffffffff816e5c7d R09: fffff52000db3f5d
R10: fffff52000db3f5d R11: 1ffff92000db3f5c R12: 0000000000000000
R13: ffff88807217f1d0 R14: 1ffff92000db3fac R15: dffffc0000000000
FS:  00007f3cd55fe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b468143950 CR3: 0000000074553000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:762 [inline]
 done_path_create+0xc4/0x150 fs/namei.c:3857
 do_mkdirat+0x254/0x440 fs/namei.c:4064
 __do_sys_mkdirat fs/namei.c:4076 [inline]
 __se_sys_mkdirat fs/namei.c:4074 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4074
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3cde48c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f3cd55fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f3cde5ac050 RCX: 00007f3cde48c0d9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007f3cde4e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc1510851f R14: 00007f3cd55fe300 R15: 0000000000022000
 </TASK>


Tested on:

commit:         3ecc3791 Merge tag 'media/v6.1-4' of git://git.kernel...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=152559eb880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d58e7fe7f9cf5e24
dashboard link: https://syzkaller.appspot.com/bug?extid=919c5a9be8433b8bf201
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14e9477d880000