On 5/18/20 1:37 AM, Will Deacon wrote: > On Sat, May 16, 2020 at 05:07:50PM -0700, Guenter Roeck wrote: >> On Sat, May 16, 2020 at 05:00:50PM -0700, Guenter Roeck wrote: >>> On Mon, May 11, 2020 at 09:41:36PM +0100, Will Deacon wrote: >>>> Now that the page table allocator can free page table allocations >>>> smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations >>>> to avoid needlessly wasting memory. >>>> >>>> Cc: "David S. Miller" <da...@davemloft.net> >>>> Cc: Peter Zijlstra <pet...@infradead.org> >>>> Signed-off-by: Will Deacon <w...@kernel.org> >>> >>> Something in the sparc32 patches in linux-next causes all my sparc32 >>> emulations >>> to crash. bisect points to this patch, but reverting it doesn't help, and >>> neither >>> does reverting the rest of the series. >>> >> Actually, turns out I see the same pattern (lots of scheduling while atomic >> followed by 'killing interrupt handler' in cryptomgr_test) with several >> powerpc boot tests. I am currently bisecting those crashes. I'll report >> the results here as well as soon as I have it. > > FWIW, I retested my sparc32 patches with PREEMPT=y and I don't see any > issues. However, linux-next is a different story, where I don't get very far > at all: > > BUG: Bad page state in process swapper pfn:005b4 > > If you're seeing this on powerpc too, I wonder if it's related to: > > https://lore.kernel.org/r/20200514170327.31389-1-r...@kernel.org > > since I think it just hit -next and the diffstat is all over the place. I've > added Mike to CC just in case. >
Here are the bisect results for ppc: # bad: [bdecf38f228bcca73b31ada98b5b7ba1215eb9c9] Add linux-next specific files for 20200515 # good: [2ef96a5bb12be62ef75b5828c0aab838ebb29cb8] Linux 5.7-rc5 git bisect start 'HEAD' 'v5.7-rc5' # good: [3674d7aa7a8e61d993886c2fb7c896c5ef85e988] Merge remote-tracking branch 'crypto/master' git bisect good 3674d7aa7a8e61d993886c2fb7c896c5ef85e988 # good: [87f6f21783522e6d62127cf33ae5e95f50874beb] Merge remote-tracking branch 'spi/for-next' git bisect good 87f6f21783522e6d62127cf33ae5e95f50874beb # good: [5c428e8277d5d97c85126387d4e00aa5adde4400] Merge remote-tracking branch 'staging/staging-next' git bisect good 5c428e8277d5d97c85126387d4e00aa5adde4400 # good: [f68de67ed934e7bdef4799fd7777c86f33f14982] Merge remote-tracking branch 'hyperv/hyperv-next' git bisect good f68de67ed934e7bdef4799fd7777c86f33f14982 # bad: [54acd2dc52b069da59639eea0d0c92726f32fb01] mm/memblock: fix a typo in comment "implict"->"implicit" git bisect bad 54acd2dc52b069da59639eea0d0c92726f32fb01 # good: [784a17aa58a529b84f7cc50f351ed4acf3bd11f3] mm: remove the pgprot argument to __vmalloc git bisect good 784a17aa58a529b84f7cc50f351ed4acf3bd11f3 # good: [6cd8137ff37e9a37aee2d2a8889c8beb8eab192f] khugepaged: replace the usage of system(3) in the test git bisect good 6cd8137ff37e9a37aee2d2a8889c8beb8eab192f # bad: [6987da379826ed01b8a1cf046b67cc8cc10117cc] sparc: remove unnecessary includes git bisect bad 6987da379826ed01b8a1cf046b67cc8cc10117cc # good: [bc17b545388f64c09e83e367898e28f60277c584] mm/hugetlb: define a generic fallback for is_hugepage_only_range() git bisect good bc17b545388f64c09e83e367898e28f60277c584 # good: [9b5aa5b43f957f03a1f4a9aff5f7924e2ebbc011] arch-kmap_atomic-consolidate-duplicate-code-checkpatch-fixes git bisect good 9b5aa5b43f957f03a1f4a9aff5f7924e2ebbc011 # bad: [89194ba5ee31567eeee9c81101b334c8e3248198] arch/kmap: define kmap_atomic_prot() for all arch's git bisect bad 89194ba5ee31567eeee9c81101b334c8e3248198 # good: [022785d2bea99f8bc2a37b7b6c525eea26f6ac59] arch-kunmap_atomic-consolidate-duplicate-code-checkpatch-fixes git bisect good 022785d2bea99f8bc2a37b7b6c525eea26f6ac59 # good: [a13c2f39e3f0519ddee57d26cc66ec70e3546106] arch/kmap: don't hard code kmap_prot values git bisect good a13c2f39e3f0519ddee57d26cc66ec70e3546106 # first bad commit: [89194ba5ee31567eeee9c81101b334c8e3248198] arch/kmap: define kmap_atomic_prot() for all arch's I don't know if that is accurate either. Maybe things are so broken that bisect gets confused, or the problem is due to interaction between different patch series. Guenter
