Bug 507500 - "MAX_LOCK_DEPTH too low!" warning during kvm guest startup
"MAX_LOCK_DEPTH too low!" warning during kvm guest startup
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
low Severity medium
: ---
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
: 527680 (view as bug list)
Depends On:
Blocks: F12VirtTarget 546576
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Reported: 2009-06-22 21:32 EDT by Saikat Guha
Modified: 2011-06-27 10:15 EDT (History)
12 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 546576 (view as bug list)
Last Closed: 2011-06-27 10:15:12 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Saikat Guha 2009-06-22 21:32:22 EDT
During boot on http://www.smolts.org/client/show/pub_fb7fc672-cdea-44da-9462-668f9497c120 running F11 + kernel-2.6.30-6.fc12.x86_64

turning off the locking correctness validator.
Pid: 1750, comm: qemu-kvm Not tainted 2.6.30-6.fc12.x86_64 #1
Call Trace:
 [<ffffffff8108a068>] __lock_acquire+0xb80/0xc0a
 [<ffffffff8108a1e0>] lock_acquire+0xee/0x12e
 [<ffffffff810ffa5f>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff810ffa5f>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff814b9e16>] _spin_lock_nest_lock+0x45/0x8e
 [<ffffffff810ffa5f>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff814b834a>] ? mutex_lock_nested+0x4f/0x6b
 [<ffffffff810ffa5f>] mm_take_all_locks+0xf7/0x141
 [<ffffffff8111540b>] ? do_mmu_notifier_register+0xb4/0x192
 [<ffffffff81115413>] do_mmu_notifier_register+0xbc/0x192
 [<ffffffff81115548>] mmu_notifier_register+0x26/0x3e
 [<ffffffffa005ec76>] kvm_dev_ioctl+0x143/0x2d9 [kvm]
 [<ffffffff811347ff>] vfs_ioctl+0x31/0xaa
 [<ffffffff81134cf5>] do_vfs_ioctl+0x47d/0x4d4
 [<ffffffff81134db1>] sys_ioctl+0x65/0x9c
 [<ffffffff81013002>] system_call_fastpath+0x16/0x1b

# rpm -qa | grep "\(kvm\|qemu\|virt\|kernel\)" | sort
Comment 1 Saikat Guha 2009-06-23 05:35:14 EDT
With kernel-2.6.31-0.24.rc0.git18.fc12.x86_64

turning off the locking correctness validator.
Pid: 1333, comm: S24avahi-daemon Not tainted 2.6.31-0.24.rc0.git18.fc12.x86_64 #1
Call Trace:
 <IRQ>  [<ffffffff81092ac8>] save_trace+0x9d/0xba
 [<ffffffff8109376c>] mark_lock+0xd6/0x253
 [<ffffffff81094b03>] __lock_acquire+0x275/0xc17
 [<ffffffff8107c91e>] ? __kernel_text_address+0x86/0x98
 [<ffffffff81095593>] lock_acquire+0xee/0x12e
 [<ffffffff8127f4cd>] ? get_hash_bucket+0x3b/0x5d
 [<ffffffff8127f4cd>] ? get_hash_bucket+0x3b/0x5d
 [<ffffffff814eeaa2>] _spin_lock_irqsave+0x5d/0xab
 [<ffffffff8127f4cd>] ? get_hash_bucket+0x3b/0x5d
 [<ffffffff8127f4cd>] get_hash_bucket+0x3b/0x5d
 [<ffffffff81280a4e>] add_dma_entry+0x26/0x62
 [<ffffffff81280e33>] debug_dma_map_page+0xf3/0x116
 [<ffffffff8142dc26>] skb_dma_map+0xf4/0x242
 [<ffffffffa0032f3b>] tg3_start_xmit_dma_bug+0x34b/0x80e [tg3]
 [<ffffffff81432cf0>] dev_hard_start_xmit+0x24d/0x30c
 [<ffffffff814492e6>] ? __qdisc_run+0xe6/0x231
 [<ffffffff8144930a>] __qdisc_run+0x10a/0x231
 [<ffffffff81433158>] dev_queue_xmit+0x263/0x396
 [<ffffffff81433074>] ? dev_queue_xmit+0x17f/0x396
 [<ffffffff8106a4a8>] ? local_bh_enable_ip+0x21/0x37
 [<ffffffff8143c403>] neigh_resolve_output+0x268/0x2af
 [<ffffffff8146c51c>] ? ip_finish_output+0x0/0x98
 [<ffffffff8146c4d7>] ip_finish_output2+0x1f3/0x238
 [<ffffffff8146c59e>] ip_finish_output+0x82/0x98
 [<ffffffff8146c935>] ip_output+0xb3/0xce
 [<ffffffff8146b047>] dst_output+0x23/0x39
 [<ffffffff8146ca29>] ip_local_out+0x32/0x4d
 [<ffffffff814986bc>] igmpv3_sendpack+0x50/0x6c
 [<ffffffff8149acdd>] igmp_ifc_timer_expire+0x269/0x2b8
 [<ffffffff8149aa74>] ? igmp_ifc_timer_expire+0x0/0x2b8
 [<ffffffff81070179>] run_timer_softirq+0x1f7/0x29e
 [<ffffffff810700e8>] ? run_timer_softirq+0x166/0x29e
 [<ffffffff8101a205>] ? read_tsc+0x9/0x1b
 [<ffffffff8108971a>] ? clocksource_read+0x22/0x38
 [<ffffffff8106a6c5>] __do_softirq+0xf6/0x1f0
 [<ffffffff8101422c>] call_softirq+0x1c/0x30
 [<ffffffff81015d77>] do_softirq+0x5f/0xd7
 [<ffffffff81069fdc>] irq_exit+0x66/0xbc
 [<ffffffff8102c180>] smp_apic_timer_interrupt+0x99/0xbf
 [<ffffffff81013bf3>] apic_timer_interrupt+0x13/0x20
 <EOI>  [<ffffffff81093ce5>] ? debug_check_no_locks_freed+0x6/0x16a
 [<ffffffff8127809e>] ? __spin_lock_init+0x2e/0x7c
 [<ffffffff8106029c>] ? mm_init+0xd6/0x1a9
 [<ffffffff81060968>] ? dup_mm+0x8a/0x3ea
 [<ffffffff814ee5cb>] ? _spin_unlock_irq+0x3f/0x61
 [<ffffffff81061973>] ? copy_process+0xc44/0x148c
 [<ffffffff8106232e>] ? do_fork+0x173/0x37a
 [<ffffffff81093c6d>] ? trace_hardirqs_on_caller+0x139/0x175
 [<ffffffff81093cc9>] ? trace_hardirqs_on+0x20/0x36
 [<ffffffff81012f7a>] ? sysret_check+0x2e/0x69
 [<ffffffff810114d2>] ? sys_clone+0x3b/0x51
 [<ffffffff814edfde>] ? trace_hardirqs_on_thunk+0x3a/0x3f
 [<ffffffff81013373>] ? stub_clone+0x13/0x20
 [<ffffffff81012f42>] ? system_call_fastpath+0x16/0x1b
Comment 2 Mark McLoughlin 2009-06-23 11:46:39 EDT
Please file the MAX_STACK_TRACE_ENTRIES issue separately.

The MAX_LOCK_DEPTH issue was discussed upstream here:


Sounds like MAX_LOCK_DEPTH does actually need to be increased for this case.
Comment 3 Saikat Guha 2009-06-23 13:44:03 EDT
MAX_STACK_TRACE_ENTRIES created as bug #507673
Comment 4 Tom London 2009-09-04 13:05:08 EDT
I'm seeing this as well with all recent rawhide kernels after booting each time I run qemu-kvm the first time.

turning off the locking correctness validator.
Pid: 2099, comm: qemu-kvm Not tainted 2.6.31-0.199.rc8.git2.fc12.x86_64 #1
Call Trace:
 [<ffffffff81098a5b>] __lock_acquire+0xb84/0xc0e
 [<ffffffff81098bd3>] lock_acquire+0xee/0x12e
 [<ffffffff8111b427>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff8111b427>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff8111b427>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff81506da6>] _spin_lock_nest_lock+0x45/0x8e
 [<ffffffff8111b427>] ? mm_take_all_locks+0xf7/0x141
 [<ffffffff8150561b>] ? mutex_lock_nested+0x4f/0x6b
 [<ffffffff8111b427>] mm_take_all_locks+0xf7/0x141
 [<ffffffff811313d8>] ? do_mmu_notifier_register+0xb4/0x192
 [<ffffffff811313e0>] do_mmu_notifier_register+0xbc/0x192
 [<ffffffff81131515>] mmu_notifier_register+0x26/0x3d
 [<ffffffffa022ceeb>] kvm_dev_ioctl+0x14a/0x2f7 [kvm]
 [<ffffffff81152a5f>] vfs_ioctl+0x31/0xaa
 [<ffffffff81153021>] do_vfs_ioctl+0x4aa/0x506
 [<ffffffff811530e2>] sys_ioctl+0x65/0x9c
 [<ffffffff81012f42>] system_call_fastpath+0x16/0x1b
kvm: emulating exchange as write

Is there some useful way of adjusting this at runtime via "sysctl" or "echo XXXX >/proc/sys/kernel/max_lock_depth"?
Comment 5 Justin M. Forbes 2009-10-07 14:49:03 EDT
It appears that several attempts have been made at increasing MAX_LOCK_DEPTH and meet a lot of upstream resistance.  Wondering if there is a better solution for this.
Comment 6 Mark McLoughlin 2009-10-09 07:13:24 EDT
*** Bug 527680 has been marked as a duplicate of this bug. ***
Comment 7 Kyle McMartin 2009-10-20 14:33:07 EDT
Making MAX_LOCK_DEPTH one bigger means another ~110bytes in task_struct... making it 48 bigger means task_struct is now another full page (and a quarter) bigger... this seems, ugh.

How deep does it need to be?
Comment 8 Bug Zapper 2010-03-15 08:40:23 EDT
This bug appears to have been reported against 'rawhide' during the Fedora 13 development cycle.
Changing version to '13'.

More information and reason for this action is here:
Comment 9 Bug Zapper 2011-06-02 13:59:57 EDT
This message is a reminder that Fedora 13 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 13.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '13'.

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Comment 10 Bug Zapper 2011-06-27 10:15:12 EDT
Fedora 13 changed to end-of-life (EOL) status on 2011-06-25. Fedora 13 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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