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| author | zhong jiang <zhongjiang@huawei.com> | 2016-12-14 15:04:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:07 -0800 |
| commit | 8e53c073a41795365eb0e47ae23441dc01c70511 (patch) | |
| tree | fcfd37098405d78c0ccb5f5662a26d50c1245845 /kernel/kexec_core.c | |
| parent | 401721ecd1dcb0a428aa5d6832ee05ffbdbffbbe (diff) | |
| download | lwn-8e53c073a41795365eb0e47ae23441dc01c70511.tar.gz lwn-8e53c073a41795365eb0e47ae23441dc01c70511.zip | |
kexec: add cond_resched into kimage_alloc_crash_control_pages
A soft lookup will occur when I run trinity in syscall kexec_load. the
corresponding stack information is as follows.
BUG: soft lockup - CPU#6 stuck for 22s! [trinity-c6:13859]
Kernel panic - not syncing: softlockup: hung tasks
CPU: 6 PID: 13859 Comm: trinity-c6 Tainted: G O L ----V------- 3.10.0-327.28.3.35.zhongjiang.x86_64 #1
Hardware name: Huawei Technologies Co., Ltd. Tecal BH622 V2/BC01SRSA0, BIOS RMIBV386 06/30/2014
Call Trace:
<IRQ> dump_stack+0x19/0x1b
panic+0xd8/0x214
watchdog_timer_fn+0x1cc/0x1e0
__hrtimer_run_queues+0xd2/0x260
hrtimer_interrupt+0xb0/0x1e0
? call_softirq+0x1c/0x30
local_apic_timer_interrupt+0x37/0x60
smp_apic_timer_interrupt+0x3f/0x60
apic_timer_interrupt+0x6d/0x80
<EOI> ? kimage_alloc_control_pages+0x80/0x270
? kmem_cache_alloc_trace+0x1ce/0x1f0
? do_kimage_alloc_init+0x1f/0x90
kimage_alloc_init+0x12a/0x180
SyS_kexec_load+0x20a/0x260
system_call_fastpath+0x16/0x1b
the first time allocation of control pages may take too much time
because crash_res.end can be set to a higher value. we need to add
cond_resched to avoid the issue.
The patch have been tested and above issue is not appear.
Link: http://lkml.kernel.org/r/1481164674-42775-1-git-send-email-zhongjiang@huawei.com
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Xunlei Pang <xpang@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/kexec_core.c')
| -rw-r--r-- | kernel/kexec_core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 8ad3a29eb728..5617cc412444 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -441,6 +441,8 @@ static struct page *kimage_alloc_crash_control_pages(struct kimage *image, while (hole_end <= crashk_res.end) { unsigned long i; + cond_resched(); + if (hole_end > KEXEC_CRASH_CONTROL_MEMORY_LIMIT) break; /* See if I overlap any of the segments */ |