linux-kernel - Re: [syzbot] INFO: rcu detected stall in __hrtimer_run

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Message-ID: <00000000000063c6a105e515ee67@google.com>
Date:   Sun, 31 Jul 2022 01:47:20 -0700
From:   syzbot <syzbot+de9526ade17c659d8336@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] INFO: rcu detected stall in __hrtimer_run_queues

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in __cfg80211_ibss_joined

------------[ cut here ]------------
WARNING: CPU: 1 PID: 8 at net/wireless/ibss.c:36 __cfg80211_ibss_joined+0x487/0x520 net/wireless/ibss.c:36
Modules linked in:
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: cfg80211 cfg80211_event_work
RIP: 0010:__cfg80211_ibss_joined+0x487/0x520 net/wireless/ibss.c:36
Code: 0f 0b e9 0c fe ff ff e8 87 19 75 f9 e9 41 fc ff ff e8 5d 19 75 f9 e9 7d fc ff ff e8 73 19 75 f9 e9 0d ff ff ff e8 79 51 32 f9 <0f> 0b e9 7e fc ff ff e8 6d 51 32 f9 0f 0b e8 66 19 75 f9 e9 e4 fb
RSP: 0018:ffffc90000cd7bd8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888028288bd0 RCX: 0000000000000000
RDX: ffff888010d25340 RSI: ffffffff88408257 RDI: 0000000000000000
RBP: ffff888028288000 R08: 0000000000000001 R09: ffffffff8ee66807
R10: fffffbfff1dccd00 R11: 0000000000000000 R12: 1ffff9200019af7d
R13: ffff888011916918 R14: 0000000000000000 R15: 0000000000000006
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005680c0 CR3: 000000001aeb4000 CR4: 0000000000350ee0
Call Trace:
 cfg80211_process_wdev_events+0x3de/0x5b0 net/wireless/util.c:977
 cfg80211_process_rdev_events+0x6e/0x100 net/wireless/util.c:1003
 cfg80211_event_work+0x1a/0x20 net/wireless/core.c:322
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296


Tested on:

commit:         f40ddce8 Linux 5.11
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16ff72fe080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3565439810a4d2e5
dashboard link: https://syzkaller.appspot.com/bug?extid=de9526ade17c659d8336
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16978a82080000