lkml.org 
[lkml]   [2014]   [May]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectsched: spinlock recursion in migrate_swap_stop
Hi all,

While fuzzing with trinity inside a KVM tools guest running the latest -next
kernel I've stumbled on the following spew:

[ 1738.758667] BUG: spinlock recursion on CPU#23, migration/23/328
[ 1738.761291] lock: 0xffff8801f93b0c30, .magic: dead4ead, .owner: migration/23/328, .owner_cpu: 23
[ 1738.762733] CPU: 23 PID: 328 Comm: migration/23 Not tainted 3.15.0-rc5-next-20140512-sasha-00019-ga20bc00-dirty #456
[ 1738.764081] ffff8801f93b0c30 ffff8805505efbc8 ffffffff9453e1ec 0000000000000004
[ 1738.764914] ffff8805505cb000 ffff8805505efbe8 ffffffff94531095 ffff8801f93b0c30
[ 1738.765120] ffffffff9583485e ffff8805505efc08 ffffffff945310c0 ffff8801f93b0c30
[ 1738.765120] Call Trace:
[ 1738.768386] dump_stack (lib/dump_stack.c:52)
[ 1738.768386] spin_dump (kernel/locking/spinlock_debug.c:68 (discriminator 6))
[ 1738.768386] spin_bug (kernel/locking/spinlock_debug.c:76)
[ 1738.768386] do_raw_spin_lock (kernel/locking/spinlock_debug.c:84 kernel/locking/spinlock_debug.c:135)
[ 1738.768386] _raw_spin_lock_nested (kernel/locking/spinlock.c:362 (discriminator 2))
[ 1738.768386] ? migrate_swap_stop (arch/x86/include/asm/paravirt.h:804 kernel/sched/sched.h:1406 kernel/sched/core.c:1099)
[ 1738.768386] ? _raw_spin_lock (kernel/locking/spinlock.c:152)
[ 1738.768386] ? migrate_swap_stop (kernel/sched/sched.h:1393 kernel/sched/core.c:1097)
[ 1738.768386] migrate_swap_stop (arch/x86/include/asm/paravirt.h:804 kernel/sched/sched.h:1406 kernel/sched/core.c:1099)
[ 1738.768386] ? queue_stop_cpus_work (include/linux/cpumask.h:108 include/linux/cpumask.h:174 kernel/stop_machine.c:375)
[ 1738.768386] multi_cpu_stop (kernel/stop_machine.c:225)
[ 1738.768386] ? queue_stop_cpus_work (kernel/stop_machine.c:171)
[ 1738.768386] cpu_stopper_thread (kernel/stop_machine.c:498)
[ 1738.768386] ? put_lock_stats.isra.12 (arch/x86/include/asm/preempt.h:98 kernel/locking/lockdep.c:254)
[ 1738.768386] ? _raw_spin_unlock_irqrestore (arch/x86/include/asm/paravirt.h:809 include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:191)
[ 1738.768386] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
[ 1738.768386] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2557 kernel/locking/lockdep.c:2599)
[ 1738.768386] smpboot_thread_fn (kernel/smpboot.c:160)
[ 1738.768386] ? __smpboot_create_thread (kernel/smpboot.c:105)
[ 1738.768386] kthread (kernel/kthread.c:210)
[ 1738.768386] ? complete (kernel/sched/completion.c:35)
[ 1738.768386] ? kthread_create_on_node (kernel/kthread.c:176)
[ 1738.768386] ret_from_fork (arch/x86/kernel/entry_64.S:553)
[ 1738.768386] ? kthread_create_on_node (kernel/kthread.c:176)


Thanks,
Sasha


\
 
 \ /
  Last update: 2014-05-12 21:41    [W:0.096 / U:0.720 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site