linux-kernel - WARNING: CPU: 0 PID: 0 at arch/x86/include/asm/kfence.h:46 kfence

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Date:   Thu, 17 Nov 2022 17:01:37 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     kasan-dev <kasan-dev@...glegroups.com>, X86 ML <x86@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, regressions@...ts.linux.dev,
        lkft-triage@...ts.linaro.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Subject: WARNING: CPU: 0 PID: 0 at arch/x86/include/asm/kfence.h:46 kfence_protect

Kunit test cases failed and found warnings while booting Linux next
version 6.1.0-rc5-next-20221117 on qemu-x86_64 [1].

It was working on Linux next-20221116 tag.

[    0.663761] WARNING: CPU: 0 PID: 0 at
arch/x86/include/asm/kfence.h:46 kfence_protect+0x7b/0x120
[    0.664033] WARNING: CPU: 0 PID: 0 at mm/kfence/core.c:234
kfence_protect+0x7d/0x120
[    0.664465] kfence: kfence_init failed

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Regressions found on qemu_x86_64:[2]

    - kunit/test_use_after_free_read
    - kunit/test_invalid_access
    - kunit/test_double_free-memcache
    - kunit/test_krealloc
    - kunit/test_shrink_memcache
    - kunit/test_memcache_typesafe_by_rcu
    - kunit/test_use_after_free_read-memcache
    - kunit/test_invalid_addr_free-memcache
    - kunit/test_out_of_bounds_read-memcache
    - kunit/test_memcache_alloc_bulk
    - kunit/test_out_of_bounds_read
    - kunit/test_memcache_ctor
    - kunit/test_corruption-memcache
    - kunit/test_gfpzero
    - kunit/test_out_of_bounds_write
    - kunit/test_out_of_bounds_write-memcache
    - kunit/test_kmalloc_aligned_oob_read
    - kunit/test_free_bulk-memcache

[    0.663758] ------------[ cut here ]------------
[    0.663761] WARNING: CPU: 0 PID: 0 at
arch/x86/include/asm/kfence.h:46 kfence_protect+0x7b/0x120
[    0.663782] Modules linked in:
[    0.663788] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
6.1.0-rc5-next-20221117 #1
[    0.663795] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-1 04/01/2014
[    0.663801] RIP: 0010:kfence_protect+0x7b/0x120
[    0.663811] Code: f1 f1 f1 f1 c7 40 04 04 f3 f3 f3 65 48 8b 04 25
28 00 00 00 48 89 45 d8 31 c0 e8 e0 0d ba ff 48 85 c0 74 06 83 7d a0
01 74 17 <0f> 0b 0f 0b c6 05 cb 97 1d 03 00 45 31 c0 c6 05 c0 97 1d 03
01 eb
[    0.663819] RSP: 0000:ffffffff9c407d98 EFLAGS: 00010002
[    0.663826] RAX: ffff8880adc01020 RBX: 00000000000001ff RCX: 80000001000001e3
[    0.663830] RDX: dffffc0000000000 RSI: ffff88811ac00000 RDI: ffff8880adc01020
[    0.663836] RBP: ffffffff9c407e18 R08: ffffffff997c8ef8 R09: ffffea00046b7f87
[    0.663841] R10: fffff940008d6ff0 R11: 0000000000000001 R12: 1ffffffff3880fb3
[    0.663845] R13: ffff88811ac00000 R14: ffffea00046b7fc0 R15: 0000000000000200
[    0.663852] FS:  0000000000000000(0000) GS:ffff88811b400000(0000)
knlGS:0000000000000000
[    0.663859] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.663864] CR2: ffff88813ffff000 CR3: 00000000ac814000 CR4: 00000000000406b0
[    0.663869] Call Trace:
[    0.663871]  <TASK>
[    0.663876]  ? __pfx_kfence_protect+0x10/0x10
[    0.663886]  ? __pfx_set_memory_4k+0x10/0x10
[    0.663899]  kfence_init_pool+0x1ea/0x350
[    0.663909]  ? __pfx_kfence_init_pool+0x10/0x10
[    0.663919]  ? random_init+0xe9/0x13b
[    0.663930]  ? __pfx_random_init+0x10/0x10
[    0.663936]  ? _find_next_bit+0x46/0xe0
[    0.663947]  kfence_init+0x42/0x1e8
[    0.663959]  start_kernel+0x1fd/0x3a6
[    0.663970]  x86_64_start_reservations+0x28/0x2e
[    0.663978]  x86_64_start_kernel+0x96/0xa0
[    0.663986]  secondary_startup_64_no_verify+0xe0/0xeb
[    0.664001]  </TASK>
[    0.664003] ---[ end trace 0000000000000000 ]---
[    0.664032] ------------[ cut here ]------------
[    0.664033] WARNING: CPU: 0 PID: 0 at mm/kfence/core.c:234
kfence_protect+0x7d/0x120
[    0.664045] Modules linked in:
[    0.664049] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W
   6.1.0-rc5-next-20221117 #1
[    0.664055] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-1 04/01/2014
[    0.664058] RIP: 0010:kfence_protect+0x7d/0x120
[    0.664068] Code: f1 f1 c7 40 04 04 f3 f3 f3 65 48 8b 04 25 28 00
00 00 48 89 45 d8 31 c0 e8 e0 0d ba ff 48 85 c0 74 06 83 7d a0 01 74
17 0f 0b <0f> 0b c6 05 cb 97 1d 03 00 45 31 c0 c6 05 c0 97 1d 03 01 eb
4a 48
[    0.664074] RSP: 0000:ffffffff9c407d98 EFLAGS: 00010002
[    0.664080] RAX: ffff8880adc01020 RBX: 00000000000001ff RCX: 80000001000001e3
[    0.664085] RDX: dffffc0000000000 RSI: ffff88811ac00000 RDI: ffff8880adc01020
[    0.664090] RBP: ffffffff9c407e18 R08: ffffffff997c8ef8 R09: ffffea00046b7f87
[    0.664095] R10: fffff940008d6ff0 R11: 0000000000000001 R12: 1ffffffff3880fb3
[    0.664099] R13: ffff88811ac00000 R14: ffffea00046b7fc0 R15: 0000000000000200
[    0.664105] FS:  0000000000000000(0000) GS:ffff88811b400000(0000)
knlGS:0000000000000000
[    0.664112] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.664116] CR2: ffff88813ffff000 CR3: 00000000ac814000 CR4: 00000000000406b0
[    0.664121] Call Trace:
[    0.664123]  <TASK>
[    0.664126]  ? __pfx_kfence_protect+0x10/0x10
[    0.664136]  ? __pfx_set_memory_4k+0x10/0x10
[    0.664146]  kfence_init_pool+0x1ea/0x350
[    0.664156]  ? __pfx_kfence_init_pool+0x10/0x10
[    0.664166]  ? random_init+0xe9/0x13b
[    0.664172]  ? __pfx_random_init+0x10/0x10
[    0.664179]  ? _find_next_bit+0x46/0xe0
[    0.664186]  kfence_init+0x42/0x1e8
[    0.664196]  start_kernel+0x1fd/0x3a6
[    0.664205]  x86_64_start_reservations+0x28/0x2e
[    0.664213]  x86_64_start_kernel+0x96/0xa0
[    0.664221]  secondary_startup_64_no_verify+0xe0/0xeb
[    0.664232]  </TASK>
[    0.664235] ---[ end trace 0000000000000000 ]---
[    0.664465] kfence: kfence_init failed

metadata:
  git_ref: master
  git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
  git_sha: af37ad1e01c72483c4ee8453d9d9bac95d35f023
  git_describe: next-20221117
  kernel_version: 6.1.0-rc5
  kernel-config: https://builds.tuxbuild.com/2Hfb6n1z0frt4iBlIvqUzjMHiLm/config
  build-url: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next/-/pipelines/697483979
  artifact-location: https://builds.tuxbuild.com/2Hfb6n1z0frt4iBlIvqUzjMHiLm
  toolchain: gcc-11


[1] https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20221117/testrun/13045566/suite/kunit/test/kfence/log
[2] https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20221117/testrun/13045566/suite/kunit/tests/
[3] https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20221117/testrun/13045566/suite/kunit/test/test_invalid_access/history/



--
Linaro LKFT
https://lkft.linaro.org