Re: [PATCH v3] printk: fix deadlock when kernel panic

2021-02-10 Thread Petr Mladek
On Wed 2021-02-10 11:48:23, Muchun Song wrote: > printk_safe_flush_on_panic() caused the following deadlock on our > server: > > CPU0: CPU1: > panic rcu_dump_cpu_stacks > kdump_nmi_shootdown_cpus

Re: [PATCH v3] printk: fix deadlock when kernel panic

2021-02-09 Thread Sergey Senozhatsky
On (21/02/10 11:48), Muchun Song wrote: > printk_safe_flush_on_panic() caused the following deadlock on our > server: > > CPU0: CPU1: > panic rcu_dump_cpu_stacks > kdump_nmi_shootdown_cpus nmi_tr

[PATCH v3] printk: fix deadlock when kernel panic

2021-02-09 Thread Muchun Song
printk_safe_flush_on_panic() caused the following deadlock on our server: CPU0: CPU1: panic rcu_dump_cpu_stacks kdump_nmi_shootdown_cpus nmi_trigger_cpumask_backtrace register_nmi_handler(cra