linux-kernel - Re: [syzbot] [gpio?] general protection fault in gpiolib_seq

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Message-ID: <67612353.050a0220.37aaf.014c.GAE@google.com>
Date: Mon, 16 Dec 2024 23:08:03 -0800
From: syzbot <syzbot+b95d0c98f01e7a95da72@...kaller.appspotmail.com>
To: brgl@...ev.pl, eadavis@...com, linus.walleij@...aro.org, 
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gpio?] general protection fault in gpiolib_seq_stop

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: lock held when returning to user space in gpiolib_seq_start

RBP: 00007fe66f38b090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fe66e775fa0 R15: 00007ffe92372dd8
 </TASK>
================================================
WARNING: lock held when returning to user space!
6.12.0-syzkaller-10299-gc1f7eb90d8d5 #0 Not tainted
------------------------------------------------
syz.0.18/6685 is leaving the kernel with locks still held!
1 lock held by syz.0.18/6685:
 #0: ffffffff8e96d590 (gpio_devices_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:158 [inline]
 #0: ffffffff8e96d590 (gpio_devices_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:249 [inline]
 #0: ffffffff8e96d590 (gpio_devices_srcu){.+.+}-{0:0}, at: gpiolib_seq_start+0x13e/0x270 drivers/gpio/gpiolib.c:5039


Tested on:

commit:         c1f7eb90 fs/seq_file: Exit the subsequent process when..
git tree:       https://github.com/ea1davis/linux gpio/syz
console output: https://syzkaller.appspot.com/x/log.txt?x=12dfb4f8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e8d97faf7b870c89
dashboard link: https://syzkaller.appspot.com/bug?extid=b95d0c98f01e7a95da72
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.