linux-kernel - Re: WARNING at watchdog_overflow

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Date:	Thu, 28 Jul 2011 14:35:21 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tglx@...utronix.de
Subject: Re: WARNING at watchdog_overflow_callback in 3.0-rc7+

On Wed, Jul 13, 2011 at 10:19:43AM -0700, Ben Greear wrote:
> This is on the same nfs testing machine I've been posting about.  This
> has some additional nfs patches included, running tests to mount, do io, unmount
> over and over again.  Seems that the NFS bugs might be finally fixed, but
> system is still un-stable in general:

This looks like it is stuck spinning on a lock while trying to cancel an
hrtimer.  Not sure under what conditions the hrtimer can't get this lock.

I cc'd Thomas, perhaps he might know.

Cheers,
Don

> 
> WARNING: at /home/greearb/git/linux-3.0-nfs/kernel/watchdog.c:240 watchdog_overflow_callback+0x97/0xa2()
> Hardware name: X7DBU
> Watchdog detected hard LOCKUP on cpu 4
> Modules linked in: 8021q garp xt_addrtype xt_TPROXY nf_tproxy_core
> xt_socket nf_defrag_ipv6 xt_set ip_set nfnetlink xt_connlimit
> macvlan ip6table_filter ip6_tables ebtable_nat ebtables pktgen fuse
> iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi stp llc nfs
> lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 kvm_intel kvm uinput
> i5k_amb i5000_edac ioatdma pcspkr iTCO_wdt e1000e dca
> iTCO_vendor_support edac_core microcode shpchp i2c_i801 floppy
> radeon ttm drm_kms_helper drm hwmon i2c_algo_bit i2c_core [last
> unloaded: xt_connmark]
> Pid: 18179, comm: btserver Not tainted 3.0.0-rc7+ #23
> Call Trace:
>  <NMI>  [<ffffffff81049f56>] warn_slowpath_common+0x80/0x98
>  [<ffffffff8104a002>] warn_slowpath_fmt+0x41/0x43
>  [<ffffffff810a1bac>] watchdog_overflow_callback+0x97/0xa2
>  [<ffffffff810c5fcb>] __perf_event_overflow+0x11f/0x1d1
>  [<ffffffff810bf41f>] ? rcu_read_unlock+0x21/0x23
>  [<ffffffff810c16e6>] ? perf_event_update_userpage+0xfe/0x103
>  [<ffffffff810c6488>] perf_event_overflow+0x14/0x16
>  [<ffffffff8101a4a6>] intel_pmu_handle_irq+0x46d/0x4e0
>  [<ffffffff814807d6>] perf_event_nmi_handler+0x39/0x81
>  [<ffffffff81482027>] notifier_call_chain+0x54/0x81
>  [<ffffffff814820b2>] __atomic_notifier_call_chain+0x5e/0x90
>  [<ffffffff81482054>] ? notifier_call_chain+0x81/0x81
>  [<ffffffff814820f3>] atomic_notifier_call_chain+0xf/0x11
>  [<ffffffff81482123>] notify_die+0x2e/0x30
>  [<ffffffff8147ff13>] do_nmi+0x80/0x242
>  [<ffffffff8147f950>] nmi+0x20/0x39
>  [<ffffffff81231ee1>] ? do_raw_spin_lock+0x11d/0x13c
>  <<EOE>>  [<ffffffff8147e7ed>] _raw_spin_lock_irqsave+0x56/0x60
>  [<ffffffff8106aed5>] ? lock_hrtimer_base+0x25/0x4b
>  [<ffffffff8106aed5>] lock_hrtimer_base+0x25/0x4b
>  [<ffffffff8106af50>] hrtimer_try_to_cancel+0x15/0x46
>  [<ffffffff8106af95>] hrtimer_cancel+0x14/0x20
>  [<ffffffff81370abf>] rtc_irq_set_state+0x8b/0xaf
>  [<ffffffff81371c10>] rtc_dev_release+0x35/0x58
>  [<ffffffff8111b07c>] fput+0x117/0x1b2
>  [<ffffffff81117b56>] filp_close+0x6d/0x78
>  [<ffffffff8104c2f7>] put_files_struct+0xca/0x190
>  [<ffffffff8104c403>] exit_files+0x46/0x4e
>  [<ffffffff8104deb7>] do_exit+0x2b5/0x760
>  [<ffffffff8111b108>] ? fput+0x1a3/0x1b2
>  [<ffffffff8122d744>] ? lockdep_sys_exit_thunk+0x35/0x67
>  [<ffffffff8104e3e0>] do_group_exit+0x7e/0xa9
>  [<ffffffff8104e41d>] sys_exit_group+0x12/0x16
>  [<ffffffff81484fd2>] system_call_fastpath+0x16/0x1b
> ---[ end trace e90038ab73718706 ]---
> 
> -- 
> Ben Greear <greearb@...delatech.com>
> Candela Technologies Inc  http://www.candelatech.com
> 
> --
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