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.
Guenter > Guenter > > --- > Bisect log: > > # bad: [bdecf38f228bcca73b31ada98b5b7ba1215eb9c9] Add linux-next specific > files for 20200515 > # good: [2ef96a5bb12be62ef75b5828c0aab838ebb29cb8] Linux 5.7-rc5 > git bisect start 'HEAD' 'v5.7-rc5' > # bad: [3674d7aa7a8e61d993886c2fb7c896c5ef85e988] Merge remote-tracking > branch 'crypto/master' > git bisect bad 3674d7aa7a8e61d993886c2fb7c896c5ef85e988 > # bad: [1ab4d6ff0a3ee4b29441d8b0076bc8d4734bd16e] Merge remote-tracking > branch 'hwmon-staging/hwmon-next' > git bisect bad 1ab4d6ff0a3ee4b29441d8b0076bc8d4734bd16e > # good: [dccfae3ab84387c94f2efc574d41efae005eeee5] Merge remote-tracking > branch 'tegra/for-next' > git bisect good dccfae3ab84387c94f2efc574d41efae005eeee5 > # bad: [20f9d1287c9f0047b81497197c9f4893485bbe15] Merge remote-tracking > branch 'djw-vfs/vfs-for-next' > git bisect bad 20f9d1287c9f0047b81497197c9f4893485bbe15 > # bad: [6537897637b5b91f921cb0ac6c465a593f4a665e] Merge remote-tracking > branch 'sparc-next/master' > git bisect bad 6537897637b5b91f921cb0ac6c465a593f4a665e > # good: [bca1583e0693e0ba76450b684c5910f7083eeef4] Merge remote-tracking > branch 'mips/mips-next' > git bisect good bca1583e0693e0ba76450b684c5910f7083eeef4 > # good: [1f12096aca212af8fad3ef58d5673cde691a1452] Merge the lockless page > table walk rework into next > git bisect good 1f12096aca212af8fad3ef58d5673cde691a1452 > # good: [23a457b8d57dc8d0cc1dbd1882993dd2fcc4b0c0] s390: nvme reipl > git bisect good 23a457b8d57dc8d0cc1dbd1882993dd2fcc4b0c0 > # good: [f57f5010c0c3fe2d924a957ddf1d17fbebb54d47] Merge remote-tracking > branch 'risc-v/for-next' > git bisect good f57f5010c0c3fe2d924a957ddf1d17fbebb54d47 > # good: [1d5fd6c33b04e5d5b665446c3b56f2148f0f1272] sh: add missing > DECLARE_EXPORT() for __ashiftrt_r4_xx > git bisect good 1d5fd6c33b04e5d5b665446c3b56f2148f0f1272 > # bad: [8c8f3156dd40f8bdc58f2ac461374bc804c28e3b] sparc32: mm: Reduce > allocation size for PMD and PTE tables > git bisect bad 8c8f3156dd40f8bdc58f2ac461374bc804c28e3b > # good: [8e958839e4b9fb6ea4385ff2c52d1333a3a618de] sparc32: mm: Restructure > sparc32 MMU page-table layout > git bisect good 8e958839e4b9fb6ea4385ff2c52d1333a3a618de > # good: [3f407976ac2953116cb8880a7a18b63bcc81829d] sparc32: mm: Change > pgtable_t type to pte_t * instead of struct page * > git bisect good 3f407976ac2953116cb8880a7a18b63bcc81829d > # first bad commit: [8c8f3156dd40f8bdc58f2ac461374bc804c28e3b] sparc32: mm: > Reduce allocation size for PMD and PTE tables > > --- > Log messages: > > Lots of: > > BUG: scheduling while atomic: kthreadd/2/0xffffffff > Modules linked in: > CPU: 0 PID: 2 Comm: kthreadd Tainted: G W > 5.7.0-rc5-next-20200515 #1 > [f04f2c94 : > here+0x16c/0x250 ] > [f04f2df0 : > schedule+0x78/0x11c ] > [f003f100 : > kthreadd+0x188/0x1a4 ] > [f0008448 : > ret_from_kernel_thread+0xc/0x38 ] > [00000000 : > 0x0 ] > > followed by: > > Kernel panic - not syncing: Aiee, killing interrupt handler! > CPU: 0 PID: 19 Comm: cryptomgr_test Tainted: G W > 5.7.0-rc5-next-20200515 #1 > [f0024400 : > do_exit+0x7c8/0xa88 ] > [f0075540 : > __module_put_and_exit+0xc/0x18 ] > [f0221428 : > cryptomgr_test+0x28/0x48 ] > [f003edc0 : > kthread+0xf4/0x12c ] > [f0008448 : > ret_from_kernel_thread+0xc/0x38 ] > [00000000 : > 0x0 ]