Here's a soft lockup that is reportedly fixed by this patchset BUG: soft lockup - CPU#1 stuck for 23s! [test.sh:1928] Kernel panic - not syncing: softlockup: hung tasks CPU: 1 PID: 1928 Comm: test.sh Tainted: G W 3.13.0-24-generic #47-Ubuntu Hardware name: NEC Mercury CPU Module [NQ2250-902]/GC-MDC10-NJ, BIOS 5.6.0005 03/05/2014 000000000000419b ffff88017fc43e28 ffffffff81715ac4 ffffffff81a5ee64 ffff88017fc43ea0 ffffffff8170ecc5 0000000000000008 ffff88017fc43eb0 ffff88017fc43e50 0000000000000086 00000000a954a952 0000000000000007 Call Trace: <IRQ> [<ffffffff81715ac4>] dump_stack+0x45/0x56 [<ffffffff8170ecc5>] panic+0xc8/0x1d7 [<ffffffff8110d015>] watchdog_timer_fn+0x165/0x170 [<ffffffff8108e537>] __run_hrtimer+0x77/0x1d0 [<ffffffff8110ceb0>] ? watchdog_cleanup+0x10/0x10 [<ffffffff8108ed3f>] hrtimer_interrupt+0xef/0x230 [<ffffffff81043087>] local_apic_timer_interrupt+0x37/0x60 [<ffffffff8172887f>] smp_apic_timer_interrupt+0x3f/0x60 [<ffffffff8172721d>] apic_timer_interrupt+0x6d/0x80 <EOI> [<ffffffff8171da2c>] ? _raw_spin_lock+0x1c/0x50 [<ffffffff811d02ce>] shrink_dentry_list+0x4e/0xe0 [<ffffffff811d10f8>] shrink_dcache_parent+0x28/0x70 [<ffffffff81224826>] proc_flush_task+0xb6/0x1b0 [<ffffffff81068540>] release_task+0x30/0x440 [<ffffffff8109e1b1>] ? thread_group_cputime_adjusted+0x41/0x50 [<ffffffff8106922f>] wait_consider_task+0x8df/0xb20 [<ffffffff81069570>] do_wait+0x100/0x240 [<ffffffff8106a6a4>] SyS_wait4+0x64/0xe0 [<ffffffff810682a0>] ? task_stopped_code+0x60/0x60 [<ffffffff817266bf>] tracesys+0xe1/0xe6
Also some machines are able to reliably reproduce this soft lockup using the following script. " #!/bin/bash mkdir -p testdir cd testdir while true; do if ! (exec >xx1 2>xx2 ; rm -f xx*; host www.google.com); then echo failed; fi ; done & while true; do ls -lR /proc >& /dev/null; done & while true; do lsof > /dev/null; done & while true; do ls -H >& /dev/null; done & wait " Although I personally have not been able to reproduce using this script. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1354234 Title: 14.04: PANIC with "dcache shrink list corruption?" problem Status in “linux” package in Ubuntu: Fix Released Status in “linux” source package in Trusty: In Progress Status in “linux” source package in Utopic: Fix Released Bug description: Hello, 14.04 kernel linux_3.13.0-32.57 panicked because of "dcache shrink list corruption?" problem. Please see followings: - details at https://lkml.org/lkml/2014/5/2/555. - argument at https://lkml.org/lkml/2014/4/29/402 - patch set at https://lkml.org/lkml/2014/5/4/7 One of 9 patches has been applied to linux_3.13.0-32.57 already. Could you apply other 8 patches to the next 14.04 kernel ? We will need the kernel at the beginning of August badly. If we will not be able to get it, we will not be able to start tests before service in. Could you release it as soon as possible ? We applied other 8 patches to linux_3.13.0-32.57 and now the panic does not occur. Public Bug URL: https://lkml.org/lkml/2014/5/2/555 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1354234/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
