linux-kernel - Re: [PATCH] mapletree-vs-khugepaged

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Date:   Thu, 28 Apr 2022 19:27:17 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mapletree-vs-khugepaged

* Guenter Roeck <linux@...ck-us.net> [220428 13:20]:
> On Wed, Apr 27, 2022 at 03:10:45PM -0700, Andrew Morton wrote:
> > Fix mapletree for patch series "Make khugepaged collapse readonly FS THP
> > more consistent", v3.
> > 
> > Cc: Liam R. Howlett <Liam.Howlett@...cle.com>
> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> 
> This patch causes all my sparc64 boot tests to fail. Bisect and crash logs
> attached.

This is very interesting.  If 49d281fa016f2906346f1707e5059b6f7674a948
"mm/mmap.c: pass in mapping to __vma_link_file()" is okay, I would
expect this one to also be okay.  Is this a case of randomization of
addresses on boot causing bad commits to be reported as good sometimes?

I'll try and get set up to test all these architectures, but a lot of
them are frustrating to get going so it might take a while.  Note that
progress may be slower due to events scheduled for next week.

Thanks,
Liam


> 
> Guenter
> 
> ---
> [   12.624703] Unable to handle kernel paging request at virtual address 0e00000000000000
> [   12.624793] tsk->{mm,active_mm}->context = 0000000000000005
> [   12.624823] tsk->{mm,active_mm}->pgd = fffff800048b8000
> [   12.624849]               \|/ ____ \|/
> [   12.624849]               "@'/ .. \`@"
> [   12.624849]               /_| \__/ |_\
> [   12.624849]                  \__U_/
> [   12.624874] init(1): Oops [#1]
> [   12.625194] CPU: 0 PID: 1 Comm: init Not tainted 5.18.0-rc4-next-20220428 #1
> [   12.625421] TSTATE: 0000009911001606 TPC: 00000000005e6330 TNPC: 00000000005e6334 Y: 00000000    Not tainted
> [   12.625455] TPC: <mmap_region+0x150/0x700>
> [   12.625503] g0: 0000000000619a00 g1: 0000000000000000 g2: fffff8000488b200 g3: 0000000000000000
> [   12.625537] g4: fffff8000414a9a0 g5: fffff8001dd3e000 g6: fffff8000414c000 g7: 0000000000000000
> [   12.625569] o0: 0000000000000000 o1: 0000000000000000 o2: 0000000001167b68 o3: 0000000000f51bb8
> [   12.625601] o4: fffff80100301fff o5: fffff8000414fc20 sp: fffff8000414f341 ret_pc: 00000000005e6310
> [   12.625630] RPC: <mmap_region+0x130/0x700>
> [   12.625692] l0: fffff8000488b260 l1: 000000000000008b l2: fffff80100302000 l3: 0000000000000000
> [   12.625725] l4: fffff80100301fff l5: 0000000000000000 l6: 30812c2a1dd8556f l7: fffff8000414b438
> [   12.625762] i0: fffff800044f58a0 i1: fffff801001ec000 i2: 0e00000000000000 i3: 0000000000000075
> [   12.625795] i4: 0000000000000000 i5: fffff8000414fde0 i6: fffff8000414f461 i7: 00000000005e6c58
> [   12.625833] I7: <do_mmap+0x378/0x500>
> [   12.625906] Call Trace:
> [   12.626006] [<00000000005e6c58>] do_mmap+0x378/0x500
> [   12.626092] [<00000000005bdc98>] vm_mmap_pgoff+0x78/0x100
> [   12.626112] [<00000000005e3d24>] ksys_mmap_pgoff+0x164/0x1c0
> [   12.626129] [<0000000000406294>] linux_sparc_syscall+0x34/0x44
> [   12.626198] Disabling lock debugging due to kernel taint
> [   12.626286] Caller[00000000005e6c58]: do_mmap+0x378/0x500
> [   12.626335] Caller[00000000005bdc98]: vm_mmap_pgoff+0x78/0x100
> [   12.626354] Caller[00000000005e3d24]: ksys_mmap_pgoff+0x164/0x1c0
> [   12.626371] Caller[0000000000406294]: linux_sparc_syscall+0x34/0x44
> [   12.626390] Caller[fffff8010001d88c]: 0xfffff8010001d88c
> [   12.626537] Instruction DUMP:
> [   12.626567]  a6100008
> [   12.626678]  02c68006
> [   12.626685]  01000000
> [   12.626690] <c25e8000>
> [   12.626696]  80a04012
> [   12.626701]  22600077
> [   12.626707]  c25ea088
> [   12.626712]  22c4c00a
> [   12.626717]  f277a7c7
> [   12.626728]
> [   12.627169] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
> 
> ---
> # bad: [bdc61aad77faf67187525028f1f355eff3849f22] Add linux-next specific files for 20220428
> # good: [af2d861d4cd2a4da5137f795ee3509e6f944a25b] Linux 5.18-rc4
> git bisect start 'HEAD' 'v5.18-rc4'
> # good: [a6ffa4aa7e81a54632f3370f4c93fce603160192] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
> git bisect good a6ffa4aa7e81a54632f3370f4c93fce603160192
> # good: [cd63f17e3bb63006f9f88bf7f5947b8e1601bcd9] Merge branch 'edac-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git
> git bisect good cd63f17e3bb63006f9f88bf7f5947b8e1601bcd9
> # good: [cee7bbed3e5cc089b5c364ac8ad4a186c2a28bb6] Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git
> git bisect good cee7bbed3e5cc089b5c364ac8ad4a186c2a28bb6
> # good: [d5a23156ea99f10b584221893a6a7d6f6554cde8] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git
> git bisect good d5a23156ea99f10b584221893a6a7d6f6554cde8
> # good: [2f1fde90d983bc404503100c9c4bbbf1e191bcf4] selftests: cgroup: fix alloc_anon_noexit() instantly freeing memory
> git bisect good 2f1fde90d983bc404503100c9c4bbbf1e191bcf4
> # good: [fca1db6ff251278c532231552e840c7dc36dfa76] Merge branch 'bitmap-for-next' of https://github.com/norov/linux.git
> git bisect good fca1db6ff251278c532231552e840c7dc36dfa76
> # good: [40b39116fe8e6fb66e3166ea40138eec506dfd91] perf: use VMA iterator
> git bisect good 40b39116fe8e6fb66e3166ea40138eec506dfd91
> # bad: [33ef257872566922df2b6bcfdb5330b2388aef53] Docs/{ABI,admin-guide}/damon: update for fixed virtual address ranges monitoring
> git bisect bad 33ef257872566922df2b6bcfdb5330b2388aef53
> # good: [2d8640f244c1ea6c40acde911d339dabc2ac765d] mm/oom_kill: use maple tree iterators instead of vma linked list
> git bisect good 2d8640f244c1ea6c40acde911d339dabc2ac765d
> # good: [49d281fa016f2906346f1707e5059b6f7674a948] mm/mmap.c: pass in mapping to __vma_link_file()
> git bisect good 49d281fa016f2906346f1707e5059b6f7674a948
> # bad: [778ae6914961a857596ccdddb69f34ad1d597cd0] selftets/damon/sysfs: test existence and permission of avail_operations
> git bisect bad 778ae6914961a857596ccdddb69f34ad1d597cd0
> # bad: [14031cb11d7f48cc0cb19084537e378fa8ce020d] mm/damon/core: add a function for damon_operations registration checks
> git bisect bad 14031cb11d7f48cc0cb19084537e378fa8ce020d
> # bad: [41fd8be857ee43f2f466fca7c2b66fea39f6540d] mapletree-vs-khugepaged
> git bisect bad 41fd8be857ee43f2f466fca7c2b66fea39f6540d
> # first bad commit: [41fd8be857ee43f2f466fca7c2b66fea39f6540d] mapletree-vs-khugepaged