linux-kernel - Re: [PATCH v2 0/5] Fix oom killer doesn't work at all if system have

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Message-ID: <4DE4733F.3030207@jp.fujitsu.com>
Date:	Tue, 31 May 2011 13:49:03 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	caiqian@...hat.com
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, rientjes@...gle.com, hughd@...gle.com,
	kamezawa.hiroyu@...fujitsu.com, minchan.kim@...il.com,
	oleg@...hat.com
Subject: Re: [PATCH v2 0/5] Fix oom killer doesn't work at all if system have
 > gigabytes memory  (aka CAI founded issue)

> OK, there was also a panic at the end. Is that expected?
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000000000002a8
> IP: [<ffffffff811227d4>] get_mm_counter+0x14/0x30
> PGD 0 
> Oops: 0000 [#1] SMP 
> CPU 7 
> Modules linked in: autofs4 sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 dm_mirror dm_region_hash dm_log microcode serio_raw pcspkr cdc_ether usbnet mii i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support sg shpchp ioatdma dca i7core_edac edac_core bnx2 ext4 mbcache jbd2 sd_mod crc_t10dif pata_acpi ata_generic ata_piix mptsas mptscsih mptbase scsi_transport_sas dm_mod [last unloaded: scsi_wait_scan]

My fault. my [1/5] has a bug. please apply following incremental patch.


index 9c7f149..f0e34d4 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -448,8 +448,8 @@ static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *no
                        task_tgid_nr(task), task_tgid_nr(task->real_parent),
                        task_uid(task),
                        task->mm->total_vm,
-                       get_mm_rss(task->mm) + p->mm->nr_ptes,
-                       get_mm_counter(p->mm, MM_SWAPENTS),
+                       get_mm_rss(task->mm) + task->mm->nr_ptes,
+                       get_mm_counter(task->mm, MM_SWAPENTS),
                        task->signal->oom_score_adj,
                        task->comm);
                task_unlock(task);


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