lkml.org 
[lkml]   [2025]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
SubjectRe: [syzbot] [block?] [mm?] INFO: rcu detected stall in wb_workfn (4)
Date
> Date: Tue, 02 Sep 2025 07:41:28 -0700	[thread overview]
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: b320789d6883 Linux 6.17-rc4
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1406ae62580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d4703ac89d9e185a
> dashboard link: https://syzkaller.appspot.com/bug?extid=5b4f4f81240931b16844
> compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133b5e34580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1639ca42580000

#syz test upstream master

--- x/kernel/rcu/tree_stall.h
+++ y/kernel/rcu/tree_stall.h
@@ -590,8 +590,15 @@ static void rcu_check_gp_kthread_starvat
if (cpu_is_offline(cpu)) {
pr_err("RCU GP kthread last ran on offline CPU %d.\n", cpu);
} else if (!(data_race(READ_ONCE(rdp->mynode->qsmask)) & rdp->grpmask)) {
+ int i;
pr_err("Stack dump where RCU GP kthread last ran:\n");
dump_cpu_task(cpu);
+ for_each_online_cpu(i) {
+ if (i == cpu)
+ continue;
+ pr_err("Stack dump on CPU%d\n", i);
+ dump_cpu_task(i);
+ }
}
wake_up_process(gpk);
}
--
\
 
 \ /
  Last update: 2025-09-03 04:35    [from the cache]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and my Meterkast|Read the blog