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SubjectRe: [rbtree_test_init] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper:1]
On Tue, 21 Nov 2017 19:10:22 +0800 Fengguang Wu <fengguang.wu@intel.com> wrote:

> Hello,
>
> FYI this happens in mainline kernel 4.14.0-03453-ge37e0ee.
> It at least dates back to v4.1 .
>
> It occurs in 2 out of 2 boots.
>
> [ 140.043368] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper:1]
> ...
> [ 140.044140] Call Trace:
> [ 140.044140] __asan_loadN+0x19/0x21
> [ 140.044140] ftrace_likely_update+0x32/0xc3:
> ftrace_likely_update at kernel/trace/trace_branch.c:209
> [ 140.044140] ? augment_recompute+0x14b/0x14b:
> augment_callbacks_rotate at lib/rbtree_test.c:97
> [ 140.044140] __rb_insert_augmented+0x8d/0x639:
> __rb_insert at lib/rbtree.c:110
> (inlined by) __rb_insert_augmented at lib/rbtree.c:495
> [ 140.044140] rbtree_test_init+0xbfb/0x1407:
> rb_insert_augmented_cached at include/linux/rbtree_augmented.h:70
> (inlined by) insert_augmented_cached at lib/rbtree_test.c:148
> (inlined by) rbtree_test_init at lib/rbtree_test.c:371
> [ 140.044140] ? glob_init+0x23f/0x23f:
> rbtree_test_init at lib/rbtree_test.c:245

Does that kernel include 0b548e33e6cb2bf ("lib/rbtree-test: lower
default params")? If so, perhaps some cond_resched() sprinkling is
needed?

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