On Mon, 6 Aug 2018, 禹舟键 wrote:
> Hi Michal
> Sorry, I cannot open the link you shared.
>
The suggestion atop your previous patch was
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -438,14 +438,6 @@ static void dump_header(struct oom_control *oc, struct
ta
Hi Michal
Sorry, I cannot open the link you shared.
On Sun 05-08-18 11:41:50, 禹舟键 wrote:
> Hi Michal and David,
> AFAICS, the null pointer is the task_struct of p in the dump_header.
> Why don't we just add a if before printing the victim task's
> informaiton.
See
http://lkml.kernel.org/r/alpine.deb.2.21.1807301854040.198...@chino.kir.corp.google.
Hi Michal and David,
AFAICS, the null pointer is the task_struct of p in the dump_header.
Why don't we just add a if before printing the victim task's
informaiton.
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -438,14 +438,6 @@ static void dump_header(struct
: [LKP] [mm, oom] c1e4c54f9c: BUG:KASAN:null-ptr-deref_in_d
On Mon 30-07-18 19:05:50, David Rientjes wrote:
> On Mon, 30 Jul 2018, Michal Hocko wrote:
>
> > On Mon 30-07-18 17:03:20, kernel test robot wrote:
> > [...]
> > > [9.034310] BUG: KASAN: null-ptr-deref
On Mon 30-07-18 19:05:50, David Rientjes wrote:
> On Mon, 30 Jul 2018, Michal Hocko wrote:
>
> > On Mon 30-07-18 17:03:20, kernel test robot wrote:
> > [...]
> > > [9.034310] BUG: KASAN: null-ptr-deref in dump_header+0x10c/0x448
> >
> > Could you faddr2line on the offset please?
> >
>
> It'
On Mon, 30 Jul 2018, Michal Hocko wrote:
> On Mon 30-07-18 17:03:20, kernel test robot wrote:
> [...]
> > [9.034310] BUG: KASAN: null-ptr-deref in dump_header+0x10c/0x448
>
> Could you faddr2line on the offset please?
>
It's possible that p is NULL when calling dump_header(). In this case
On 07/30/2018 05:56 PM, Michal Hocko wrote:
On Mon 30-07-18 17:03:20, kernel test robot wrote:
[...]
[9.034310] BUG: KASAN: null-ptr-deref in dump_header+0x10c/0x448
Could you faddr2line on the offset please?
The result is:
dump_header+0x10c/0x448:
__read_once_size at include/linux/com
On Mon 30-07-18 17:03:20, kernel test robot wrote:
[...]
> [9.034310] BUG: KASAN: null-ptr-deref in dump_header+0x10c/0x448
Could you faddr2line on the offset please?
> [9.034310] Read of size 8 at addr 09b0 by task swapper/0/1
> [9.034310]
> [9.034310] CPU: 0 PID: 1
FYI, we noticed the following commit (built with gcc-5):
commit: c1e4c54f9c750fc3ea4715f5363b92ea4d4efb29 ("mm, oom: reorganize the oom
report in dump_header")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: boot
on test machine: qemu-system-x86_64 -enable-k
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