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| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2017-02-10 12:54:05 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-02-10 11:00:23 +0100 |
| commit | 146fbb766934dc003fcbf755b519acef683576bf (patch) | |
| tree | cb8a89a1a93abce2de66d5ded015154aebf3af75 /include/linux/eisa.h | |
| parent | 5f2e71e71410ecb858cfec184ba092adaca61626 (diff) | |
| download | op-kernel-dev-146fbb766934dc003fcbf755b519acef683576bf.zip op-kernel-dev-146fbb766934dc003fcbf755b519acef683576bf.tar.gz | |
x86/mm/ptdump: Fix soft lockup in page table walker
CONFIG_KASAN=y needs a lot of virtual memory mapped for its shadow.
In that case ptdump_walk_pgd_level_core() takes a lot of time to
walk across all page tables and doing this without
a rescheduling causes soft lockups:
NMI watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [swapper/0:1]
...
Call Trace:
ptdump_walk_pgd_level_core+0x40c/0x550
ptdump_walk_pgd_level_checkwx+0x17/0x20
mark_rodata_ro+0x13b/0x150
kernel_init+0x2f/0x120
ret_from_fork+0x2c/0x40
I guess that this issue might arise even without KASAN on huge machines
with several terabytes of RAM.
Stick cond_resched() in pgd loop to fix this.
Reported-by: Tobias Regnery <tobias.regnery@gmail.com>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: kasan-dev@googlegroups.com
Cc: Alexander Potapenko <glider@google.com>
Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20170210095405.31802-1-aryabinin@virtuozzo.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/eisa.h')
0 files changed, 0 insertions, 0 deletions
