Hi Josh,
On Mon, Oct 02, 2017 at 04:31:09PM -0500, Josh Poimboeuf wrote:
On Mon, Oct 02, 2017 at 04:26:54PM -0500, Josh Poimboeuf wrote:
Fengguang, assuming it's reliably recreatable, any chance you could
recreate with the following patch?
Sure, I'll try your patch on v4.14-rc3 since it looks the most
reproducible kernel. For the bisected 4879b7ae05, the warning only
shows up once out of 909 boots according to the below stats. So I'm
not sure whether it's the _first_ bad commit. To double confirm, I
just queued 5000 more boot tests for each of its parent commits.
ecc721a72c Merge tag 'pwm/for-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
be13ec668d Merge branch 'topic/pl330' into for-linus
4879b7ae05 Merge tag 'dmaengine-4.12-rc1' of git://git.infradead.org/users/vkoul/slave-dma
9e66317d3c Linux 4.14-rc3
1418b85217 Add linux-next specific files for 20170929
+-------------------------------------------------------+------------+------------+------------+-----------+---------------+
| | ecc721a72c | be13ec668d | 4879b7ae05 | v4.14-rc3 | next-20170929 |
+-------------------------------------------------------+------------+------------+------------+-----------+---------------+
| boot_successes | 1009 | 1009 | 909 | 5 | 510 |
| boot_failures | 0 | 0 | 1 | 4 | 153 |
| WARNING:kernel_stack | 0 | 0 | 1 | 3 | 111 |
| BUG:unable_to_handle_kernel | 0 | 0 | 0 | 3 | 48 |
| Oops:#[##] | 0 | 0 | 0 | 3 | 48 |
| EIP:update_stack_state | 0 | 0 | 0 | 3 | 48 |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 0 | 0 | 3 | 48 |
| invoked_oom-killer:gfp_mask=0x | 0 | 0 | 0 | 1 | 16 |
| Mem-Info | 0 | 0 | 0 | 1 | 16 |
| EIP:clear_user | 0 | 0 | 0 | 0 | 2 |
| EIP:copy_page_to_iter | 0 | 0 | 0 | 0 | 1 |
+-------------------------------------------------------+------------+------------+------------+-----------+---------------+
Sorry, here's a version which actually compiles.
OK.
Thanks,
Fengguang
diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c
index d145a0b1f529..00234fa5a33a 100644
--- a/arch/x86/kernel/unwind_frame.c
+++ b/arch/x86/kernel/unwind_frame.c
@@ -44,7 +44,8 @@ static void unwind_dump(struct unwind_state *state)
state->stack_info.type, state->stack_info.next_sp,
state->stack_mask, state->graph_idx);
- for (sp = state->orig_sp; sp; sp = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
+ for (sp = PTR_ALIGN(state->orig_sp, sizeof(long)); sp;
+ sp = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
if (get_stack_info(sp, state->task, &stack_info, &visit_mask))
break;
--
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