New: OOM deadlock

https://bugzilla.kernel.org/show_bug.cgi?id=59901

Summary: OOM deadlock
Product: Memory Management
Version: 2.5
Kernel Version: v3.10-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No

Apparently with kernel v3.10-rc6 when triggering an OOM enough times the mm subsystem locks up (haven't tried any other kernel versions yet). Leaving the following script running for a few minutes is sufficient to trigger the lockup:

#!/bin/bash
swapoff -a
while true; do

    free="$(free | sed -n
's|.*buffers/cache:[[:blank:]]*[^[:blank:]]*[[:blank:]]*||p')"
    for ((i=free-15000;i<free;i+=1000)); do
        echo "size $i KB ..."
    dd if=/dev/zero of=/dev/null bs=${i}K count=1
    done

done

When the lockup occurs sometimes the following kernel messages are generated:

[  840.360097] INFO: task rtkit-daemon:1538 blocked for more than 120 seconds.  
[  840.360117] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
[  840.360122] rtkit-daemon    D ffffffffffffffff     0  1538      1 0x00000000 
[  840.360129]  ffff880029d19dc0 0000000000000046 ffff880029d10000
ffff880029d19
[  840.360136]  ffff880029d19fd8 ffff880029d19fd8 ffff880036dc0000
ffff880029d10
[  840.360142]  ffff880029d10000 ffff88003bc347f0 ffff88003bc347f8
ffff88003bc34
[  840.360149] Call Trace:                                                      
[  840.360158]  [<ffffffff8152b9e9>] schedule+0x29/0x70                         
[  840.360162]  [<ffffffff8152c415>] rwsem_down_write_failed+0xe5/0x190         
[  840.360167]  [<ffffffff8108046d>] ? sched_clock_local+0x1d/0x90              
[  840.360173]  [<ffffffff81245d23>] call_rwsem_down_write_failed+0x13/0x20     
[  840.360177]  [<ffffffff8152a1aa>] ? down_write+0x9a/0xc0                     
[  840.360182]  [<ffffffff811330e4>] ? vm_mmap_pgoff+0x54/0xb0
[  840.360186]  [<ffffffff811330e4>] vm_mmap_pgoff+0x54/0xb0
[  840.360190]  [<ffffffff8114561b>] SyS_mmap_pgoff+0x5b/0x280
[  840.360194]  [<ffffffff81245dbe>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  840.360198]  [<ffffffff81006882>] SyS_mmap+0x22/0x30
[  840.360208]  [<ffffffff815367d9>] system_call_fastpath+0x16/0x1b
[  840.360211] 1 lock held by rtkit-daemon/1538:
[  840.360213]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff811330e4>]

vm_mmap_p

Signature · 3 lines

Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.