Messages in this thread Patch in this message | | | From | Andrey Ryabinin <> | Subject | [PATCH] x86/unwind_guess: Prevent using UNWINDER_GUESS=y with STACKDEPOT=y | Date | Thu, 30 Nov 2017 15:35:54 +0300 |
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Stackdepot doesn't work well with CONFIG_UNWINDER_GUESS=y. The 'guess' unwinder generate awfully large and inaccurate stacktraces, thus stackdepot can't deduplicate stacktraces because they all look like unique. Eventually stackdepot reaches its capacity limit:
WARNING: CPU: 0 PID: 545 at lib/stackdepot.c:119 depot_save_stack+0x28e/0x550 Call Trace: ? kasan_kmalloc+0x144/0x160 ? depot_save_stack+0x1f5/0x550 ? do_raw_spin_unlock+0xda/0xf0 ? preempt_count_sub+0x13/0xc0
<...90 lines...>
? do_raw_spin_unlock+0xda/0xf0
Add STACKDEPOT=n dependency to UNWINDER_GUESS to avoid the problem.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Reported-by: kernel test robot <xiaolong.ye@intel.com> Reported-by: Fengguang Wu <fengguang.wu@intel.com> --- arch/x86/Kconfig.debug | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 6293a8768a91..672441c008c7 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -400,6 +400,7 @@ config UNWINDER_FRAME_POINTER config UNWINDER_GUESS bool "Guess unwinder" depends on EXPERT + depends on !STACKDEPOT ---help--- This option enables the "guess" unwinder for unwinding kernel stack traces. It scans the stack and reports every kernel text address it -- 2.13.6
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