On my server(x86_64) when the mcelog is executed, it will cause oops. And
following information could be gotten.
Call Trace:
[<ffffffff812ceefd>] ? avc_has_perm_noaudit+0x4d/0x680
[<ffffffff812ceefd>] ? avc_has_perm_noaudit+0x4d/0x680
[<ffffffff8142492b>] erst_read_next+0x3b/0x100
[<ffffffff81028def>] apei_read_mce+0x2f/0x170
[<ffffffff811bfc5d>] ? check_object+0x36d/0x430
[<ffffffff811c059c>] ? init_object+0x9c/0xe0
[<ffffffff811c38ef>] ? __slab_alloc+0x7cf/0x8b0
[<ffffffff81025cba>] ? mce_read+0x4a/0x510
[<ffffffff811c49ab>] ? __kmalloc+0x2db/0x390
[<ffffffff81025cba>] ? mce_read+0x4a/0x510
[<ffffffff811bf81d>] ? check_bytes_and_report+0x3d/0x110
[<ffffffff816caf1e>] ? _cond_resched+0x3e/0x80
[<ffffffff8102613b>] mce_read+0x4cb/0x510
[<ffffffff812cb9f2>] ? security_file_permission+0x122/0x130
[<ffffffff811dff16>] ? rw_verify_area+0x196/0x210
[<ffffffff811e0e7b>] vfs_read+0x1bb/0x2f0
[<ffffffff811e172d>] sys_read+0x8d/0xe0
[<ffffffff81003c9b>] system_call_fastpath+0x16/0x1b
This is because of the ERST Table not supported on my server and it
makes the variable "ctx" used by erst_read_nextis NULL. So I make
the patch to solve this problem.
And I confirmed it on my server(x86_64).
Signed-off-by: Jin Dongming <jin.dongming@xxxxxxxxxxxxxxxxxx>
---
drivers/acpi/apei/erst.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 5fe5c0f..2ebc391 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -698,6 +698,9 @@ ssize_t erst_read_next(struct cper_record_header *record, size_t buflen)
unsigned long flags;
u64 record_id;
+ if (erst_disable)
+ return -ENODEV;
+
spin_lock_irqsave(&erst_lock, flags);
rc = __erst_get_next_record_id(&record_id);
if (rc) {
--
1.7.0.3
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