netdev - Re: [syzbot] [net?] INFO: task hung in inet_rtm

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Message-ID: <6876c042.a00a0220.3af5df.0009.GAE@google.com>
Date: Tue, 15 Jul 2025 13:55:30 -0700
From: syzbot <syzbot+adeb8550754921fece20@...kaller.appspotmail.com>
To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, 
	horms@...nel.org, jhs@...atatu.com, jiri@...nulli.us, kadlec@...filter.org, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	netfilter-devel@...r.kernel.org, pabeni@...hat.com, pablo@...filter.org, 
	syzkaller-bugs@...glegroups.com, vinicius.gomes@...el.com, 
	xiyou.wangcong@...il.com
Subject: Re: [syzbot] [net?] INFO: task hung in inet_rtm_newaddr

syzbot has found a reproducer for the following issue on:

HEAD commit:    0be23810e32e Add linux-next specific files for 20250714
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17c3e98c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=adc3ea2bfe31343b
dashboard link: https://syzkaller.appspot.com/bug?extid=adeb8550754921fece20
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16d1098c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=116b08f0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/13b5be5048fe/disk-0be23810.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3d2b3b2ceddf/vmlinux-0be23810.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c7e5fbf3efa6/bzImage-0be23810.xz

The issue was bisected to:

commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Date:   Sat Sep 29 00:59:43 2018 +0000

    tc: Add support for configuring the taprio scheduler

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10de9adf980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12de9adf980000
console output: https://syzkaller.appspot.com/x/log.txt?x=14de9adf980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+adeb8550754921fece20@...kaller.appspotmail.com
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

INFO: task syz-executor:6015 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc6-next-20250714-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:26920 pid:6015  tgid:6015  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5314 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6697
 __schedule_loop kernel/sched/core.c:6775 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6790
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6847
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747
 rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 inet_rtm_newaddr+0x3b0/0x18b0 net/ipv4/devinet.c:979


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.