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Message-ID: <55061690.3080006@oracle.com> Date: Sun, 15 Mar 2015 19:32:32 -0400 From: Sasha Levin <sasha.levin@...cle.com> To: paulmck@...ux.vnet.ibm.com CC: Josh Triplett <josh@...htriplett.org>, Steven Rostedt <rostedt@...dmis.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Lai Jiangshan <laijs@...fujitsu.com>, LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com> Subject: Re: rcu: frequent rcu lockups On 03/15/2015 04:43 PM, Paul E. McKenney wrote: > But I did find a bug that would result in the other warnings, and could > also result in too-short grace periods, which could in turn result in > arbitrarily arbitrary misbehavior. The patch below, which is also on > its way into -next, should fix this. Please let me know how it does > for you. I've stopped seeing the warnings I've previously reported, but started seeing a new one: [ 788.564596] WARNING: CPU: 12 PID: 9711 at kernel/rcu/tree.c:2201 rcu_report_qs_rnp+0x42e/0x5a0() [ 788.568123] Modules linked in: [ 788.568123] CPU: 12 PID: 9711 Comm: trinity-main Not tainted 4.0.0-rc3-next-20150313-sasha-00041-g83a3dc8-dirty #2078 [ 788.568123] ffff8803a1ba0000 00000000400df16a ffff880442807cc8 ffffffffb1ab01ca [ 788.568123] 0000000000000000 0000000000000000 ffff880442807d18 ffffffffa71e261a [ 788.568123] dffffc0000000000 ffffffffa733d2ee ffff880442807d28 ffffffffb4724000 [ 788.568123] Call Trace: [ 788.568123] <IRQ> dump_stack (lib/dump_stack.c:52) [ 788.568123] warn_slowpath_common (kernel/panic.c:447) [ 788.568123] ? rcu_report_qs_rnp (kernel/rcu/tree.c:2201 (discriminator 3)) [ 788.568123] warn_slowpath_null (kernel/panic.c:481) [ 788.568123] rcu_report_qs_rnp (kernel/rcu/tree.c:2201 (discriminator 3)) [ 788.568123] rcu_process_callbacks (kernel/rcu/tree.c:2302 kernel/rcu/tree.c:2338 kernel/rcu/tree.c:2824 kernel/rcu/tree.c:2857) [ 788.568123] __do_softirq (kernel/softirq.c:273 include/linux/jump_label.h:114 include/trace/events/irq.h:126 kernel/softirq.c:274) [ 788.568123] irq_exit (kernel/softirq.c:350 kernel/softirq.c:391) [ 788.568123] smp_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:918) [ 788.568123] apic_timer_interrupt (arch/x86/kernel/entry_64.S:920) [ 788.568123] <EOI> ? mark_held_locks (kernel/locking/lockdep.c:2525) [ 788.568123] finish_task_switch (kernel/sched/core.c:2231) [ 788.568123] __schedule (kernel/sched/core.c:2337 kernel/sched/core.c:2795) [ 788.568123] schedule (./arch/x86/include/asm/bitops.h:311 (discriminator 1) kernel/sched/core.c:2824 (discriminator 1)) [ 788.568123] schedule_preempt_disabled (kernel/sched/core.c:2856) [ 788.568123] mutex_lock_nested (kernel/locking/mutex.c:585 kernel/locking/mutex.c:623) [ 788.568123] kernfs_iop_permission (fs/kernfs/inode.c:366) [ 788.568123] __inode_permission (fs/namei.c:374 fs/namei.c:408) [ 788.568123] inode_permission (fs/namei.c:460) [ 788.568123] link_path_walk (fs/namei.c:1520 fs/namei.c:1782) [ 788.568123] path_init (fs/namei.c:1947) [ 788.568123] path_lookupat (fs/namei.c:1989) [ 788.568123] filename_lookup (fs/namei.c:2025) [ 788.568123] user_path_at_empty (fs/namei.c:2189) [ 788.568123] user_path_at (fs/namei.c:2200) [ 788.568123] vfs_fstatat (fs/stat.c:106) [ 788.568123] SYSC_newfstatat (fs/stat.c:298) [ 788.568123] SyS_newfstatat (fs/stat.c:291) [ 788.568123] tracesys_phase2 (arch/x86/kernel/entry_64.S:347) Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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