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| author | Andrey Ryabinin <[email protected]> | 2017-02-10 09:54:05 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2017-02-10 10:00:23 +0000 |
| commit | 146fbb766934dc003fcbf755b519acef683576bf (patch) | |
| tree | cb8a89a1a93abce2de66d5ded015154aebf3af75 /drivers/gpu/drm/imx/imx-tve.c | |
| parent | x86/tsc: Make the TSC ADJUST sanitizing work for tsc_reliable (diff) | |
| download | kernel-146fbb766934dc003fcbf755b519acef683576bf.tar.gz kernel-146fbb766934dc003fcbf755b519acef683576bf.zip | |
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 <[email protected]>
Signed-off-by: Andrey Ryabinin <[email protected]>
Cc: [email protected]
Cc: Alexander Potapenko <[email protected]>
Cc: "Paul E . McKenney" <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/imx/imx-tve.c')
0 files changed, 0 insertions, 0 deletions