On Mon, Jul 16, 2018 at 11:40:06AM +0100, Guillaume Tucker wrote: > On 15/07/18 01:32, kernelci.org bot wrote: > > mainline/master boot: 177 boots: 2 failed, 174 passed with 1 conflict (v4.18-rc4-160-gf353078f028f) > > > > Full Boot Summary: https://kernelci.org/boot/all/job/mainline/branch/master/kernel/v4.18-rc4-160-gf353078f028f/ > > Full Build Summary: https://kernelci.org/build/mainline/branch/master/kernel/v4.18-rc4-160-gf353078f028f/ > > > > Tree: mainline > > Branch: master > > Git Describe: v4.18-rc4-160-gf353078f028f > > Git Commit: f353078f028fbfe9acd4b747b4a19c69ef6846cd > > Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > Tested: 67 unique boards, 25 SoC families, 21 builds out of 199 > > > > Boot Regressions Detected: > [...] > > x86: > > > > i386_defconfig: > > x86-celeron: > > lab-mhart: new failure (last pass: v4.18-rc4-147-g2db39a2f491a) > > x86-pentium4: > > lab-mhart: new failure (last pass: v4.18-rc4-147-g2db39a2f491a) > > Please see below an automated bisection report for this > regression. Several bisections were run on other x86 platforms > with i386_defconfig on a few revisions up to v4.18-rc5, they all > reached the same "bad" commit. > > > Unfortunately there isn't much to learn from the kernelci.org > boot logs as the kernel seems to crash very early on: > > https://kernelci.org/boot/all/job/mainline/branch/master/kernel/v4.18-rc5/ > https://storage.kernelci.org/mainline/master/v4.18-rc4-160-gf353078f028f/x86/i386_defconfig/lab-mhart/lava-x86-celeron.html > > > It looks like stable-rc/linux-4.17.y is also broken with > i386_defconfig, which tends to confirm the "bad" commit found by > the automated bisection which was applied there as well: > > https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.17.y/kernel/v4.17.6-68-gbc0bd9e05fa1/ Adding Greg directly to the CCs due to the stable impact, not deleting context for his benefit. > The automated bisection on kernelci.org is still quite new, so > please take the results with a pinch of salt as the "bad" commit > found may not be the actual root cause of the boot failure. > > Hope this helps! > > Best wishes, > Guillaume > > > --------------------------------------8<-------------------------------------- > > > > Bisection result for mainline/master (v4.18-rc4-160-gf353078f028f) on x86-celeron > > Good: 2db39a2f491a Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux > Bad: f353078f028f Merge branch 'akpm' (patches from Andrew) > Found: e181ae0c5db9 mm: zero unavailable pages before memmap init > > Checks: > revert: PASS > verify: PASS > > Parameters: > Tree: mainline > URL: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > Branch: master > Target: x86-celeron > Lab: lab-mhart > Config: i386_defconfig > Plan: boot > > Breaking commit found: > > ------------------------------------------------------------------------------- > commit e181ae0c5db9544de9c53239eb22bc012ce75033 > Author: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> > Date: Sat Jul 14 09:15:07 2018 -0400 > > mm: zero unavailable pages before memmap init > We must zero struct pages for memory that is not backed by physical > memory, or kernel does not have access to. > Recently, there was a change which zeroed all memmap for all holes in > e820. Unfortunately, it introduced a bug that is discussed here: > https://www.spinics.net/lists/linux-mm/msg156764.html > Linus, also saw this bug on his machine, and confirmed that reverting > commit 124049decbb1 ("x86/e820: put !E820_TYPE_RAM regions into > memblock.reserved") fixes the issue. > The problem is that we incorrectly zero some struct pages after they > were setup. > The fix is to zero unavailable struct pages prior to initializing of > struct pages. > A more detailed fix should come later that would avoid double zeroing > cases: one in __init_single_page(), the other one in > zero_resv_unavail(). > Fixes: 124049decbb1 ("x86/e820: put !E820_TYPE_RAM regions into memblock.reserved") > Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> > Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 1521100f1e63..5d800d61ddb7 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -6847,6 +6847,7 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) > /* Initialise every node */ > mminit_verify_pageflags_layout(); > setup_nr_node_ids(); > + zero_resv_unavail(); > for_each_online_node(nid) { > pg_data_t *pgdat = NODE_DATA(nid); > free_area_init_node(nid, NULL, > @@ -6857,7 +6858,6 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) > node_set_state(nid, N_MEMORY); > check_for_memory(pgdat, nid); > } > - zero_resv_unavail(); > } > static int __init cmdline_parse_core(char *p, unsigned long *core, > @@ -7033,9 +7033,9 @@ void __init set_dma_reserve(unsigned long new_dma_reserve) > void __init free_area_init(unsigned long *zones_size) > { > + zero_resv_unavail(); > free_area_init_node(0, zones_size, > __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); > - zero_resv_unavail(); > } > static int page_alloc_cpu_dead(unsigned int cpu) > ------------------------------------------------------------------------------- > > > Git bisection log: > > ------------------------------------------------------------------------------- > git bisect start > # good: [2db39a2f491a48ec740e0214a7dd584eefc2137d] Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux > git bisect good 2db39a2f491a48ec740e0214a7dd584eefc2137d > # bad: [f353078f028fbfe9acd4b747b4a19c69ef6846cd] Merge branch 'akpm' (patches from Andrew) > git bisect bad f353078f028fbfe9acd4b747b4a19c69ef6846cd > # good: [fa8cbda88db12e632a8987c94b66f5caf25bcec4] x86/purgatory: add missing FORCE to Makefile target > git bisect good fa8cbda88db12e632a8987c94b66f5caf25bcec4 > # good: [bb177a732c4369bb58a1fe1df8f552b6f0f7db5f] mm: do not bug_on on incorrect length in __mm_populate() > git bisect good bb177a732c4369bb58a1fe1df8f552b6f0f7db5f > # good: [fe10e398e860955bac4d28ec031b701d358465e4] reiserfs: fix buffer overflow with long warning messages > git bisect good fe10e398e860955bac4d28ec031b701d358465e4 > # bad: [e181ae0c5db9544de9c53239eb22bc012ce75033] mm: zero unavailable pages before memmap init > git bisect bad e181ae0c5db9544de9c53239eb22bc012ce75033 > # first bad commit: [e181ae0c5db9544de9c53239eb22bc012ce75033] mm: zero unavailable pages before memmap init > ------------------------------------------------------------------------------- > > _______________________________________________ > Kernel-build-reports mailing list > Kernel-build-reports@xxxxxxxxxxxxxxxx > https://lists.linaro.org/mailman/listinfo/kernel-build-reports
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