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From:   Liam Howlett <liam.howlett@oracle.com>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
CC:     Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
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        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
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        Andrew Morton <akpm@linux-foundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        David Howells <dhowells@redhat.com>,
        SeongJae Park <sj@kernel.org>, Will Deacon <will@kernel.org>,
        Davidlohr Bueso <dave@stgolabs.net>
Subject: Re: [next ] kernel BUG at mm/mmap.c:3235! - invalid opcode: 0000 [#1]
 PREEMPT SMP NOPTI
Thread-Topic: [next ] kernel BUG at mm/mmap.c:3235! - invalid opcode: 0000
 [#1] PREEMPT SMP NOPTI
Thread-Index: AQHYaPFZjjbpOCHDMU+Oev6jN9i6VK0ho2yA
Date:   Mon, 16 May 2022 15:36:12 +0000
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* Naresh Kamboju <naresh.kamboju@linaro.org> [220516 02:51]:
> While running LTP mm tests on x86_64 the following kernel BUG was noticed
> on Linux next-20220513 [1].
>=20
> mmapstress01    1  TPASS  :  Test passed
> mmapstress02    1  TPASS  :  Test passed
> mmapstress03    0  TINFO  :  uname.machine=3Dx86_64 kernel is 64bit
> mmapstress03    1  TPASS  :  Test passed
> [  666.897222] ------------[ cut here ]------------
> [  666.897260] kernel BUG at mm/mmap.c:3235!
> [  666.897285] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> [  666.899420] CPU: 3 PID: 25230 Comm: mmapstress03 Not tainted
> 5.18.0-rc6-next-20220513 #1
> [  666.900552] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [  666.901868] RIP: 0010:exit_mmap+0x32c/0x3a0
> [  666.902542] Code: 87 78 03 00 00 00 00 00 02 0f 84 41 fe ff ff 4c
> 89 ff e8 37 bb fa ff f0 41 80 8f 7a 03 00 00 20 e9 2b fe ff ff e8 74
> e5 e1 00 <0f> 0b 65 8b 05 b3 ab 63 55 89 c0 48 0f a3 05 39 4b f0 01 0f
> 83 36
> [  666.905542] RSP: 0018:ffff991342abbd10 EFLAGS: 00010202
> [  666.906334] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff93ea0=
353540c
> [  666.907464] RDX: ffffffffffffffff RSI: 0000000000000000 RDI: ffff99134=
2abbd18
> [  666.908589] RBP: ffff991342abbe08 R08: 00007ffe337a6fff R09: 000000000=
0000009
> [  666.909745] R10: ffffffffffffff00 R11: ffff991342abbd40 R12: 000000000=
0000058
> [  666.910810] R13: ffff991342abbd18 R14: 0000000000000012 R15: ffff93ea0=
7f8d800
> [  666.911940] FS:  00007fad8494b580(0000) GS:ffff93ea3bd80000(0000)
> knlGS:0000000000000000
> [  666.913153] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  666.914147] CR2: 0000000000bba268 CR3: 0000000075610000 CR4: 000000000=
03506e0
> [  666.915119] Call Trace:
> [  666.915473]  <TASK>
> [  666.915805]  __mmput+0x47/0x100
> [  666.916280]  mmput+0x20/0x30
> [  666.916677]  exit_mm+0xe7/0x150
> [  666.917116]  do_exit+0x1c5/0xa40
> [  666.917566]  ? __audit_syscall_entry+0x109/0x130
> [  666.918220]  do_group_exit+0x54/0xb0
> [  666.918708]  __do_sys_exit_group+0xf/0x10
> [  666.919249]  __se_sys_exit_group+0xe/0x10
> [  666.919790]  __x64_sys_exit_group+0x12/0x20
> [  666.920356]  do_syscall_64+0x35/0x60
> [  666.920876]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
> [  666.921561] RIP: 0033:0x7fad842c1846
> [  666.922095] Code: Unable to access opcode bytes at RIP 0x7fad842c181c.
> [  666.922959] RSP: 002b:00007ffe336ad8b8 EFLAGS: 00000246 ORIG_RAX:
> 00000000000000e7
> [  666.923954] RAX: ffffffffffffffda RBX: 00007fad845a9740 RCX: 00007fad8=
42c1846
> [  666.924895] RDX: 0000000000000000 RSI: 000000000000003c RDI: 000000000=
0000000
> [  666.925846] RBP: 0000000000000000 R08: 00000000000000e7 R09: fffffffff=
fffff80
> [  666.926779] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fad8=
45a9740
> [  666.927711] R13: 0000000000000001 R14: 00007fad845b2628 R15: 000000000=
0000000
> [  666.928671]  </TASK>
> [  666.928976] Modules linked in:
> [  666.929491] ---[ end trace 0000000000000000 ]---
> [  666.929502] RIP: 0010:exit_mmap+0x32c/0x3a0
> [  666.929508] Code: 87 78 03 00 00 00 00 00 02 0f 84 41 fe ff ff 4c
> 89 ff e8 37 bb fa ff f0 41 80 8f 7a 03 00 00 20 e9 2b fe ff ff e8 74
> e5 e1 00 <0f> 0b 65 8b 05 b3 ab 63 55 89 c0 48 0f a3 05 39 4b f0 01 0f
> 83 36
> [  666.929511] RSP: 0018:ffff991342abbd10 EFLAGS: 00010202
> [  666.929513] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff93ea0=
353540c
> [  666.929516] RDX: ffffffffffffffff RSI: 0000000000000000 RDI: ffff99134=
2abbd18
> [  666.929518] RBP: ffff991342abbe08 R08: 00007ffe337a6fff R09: 000000000=
0000009
> [  666.929520] R10: ffffffffffffff00 R11: ffff991342abbd40 R12: 000000000=
0000058
> [  666.929522] R13: ffff991342abbd18 R14: 0000000000000012 R15: ffff93ea0=
7f8d800
> [  666.929527] FS:  00007fad8494b580(0000) GS:ffff93ea3bd80000(0000)
> knlGS:0000000000000000
> [  666.929531] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  666.929535] CR2: 0000000000bba268 CR3: 0000000075610000 CR4: 000000000=
03506e0
> [  666.929540] Fixing recursive fault but reboot is needed!
> [  666.929544] BUG: using smp_processor_id() in preemptible [00000000]
> code: mmapstress03/25230
> [  666.929562] caller is debug_smp_processor_id+0x17/0x20
> [  666.929575] CPU: 3 PID: 25230 Comm: mmapstress03 Tainted: G      D
>          5.18.0-rc6-next-20220513 #1
> [  666.929580] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [  666.929582] Call Trace:
> [  666.929584]  <TASK>
> [  666.929586]  dump_stack_lvl+0x6c/0x9a
> [  666.929590]  dump_stack+0x10/0x12
> [  666.929594]  check_preemption_disabled+0x10f/0x120
> [  666.929606]  debug_smp_processor_id+0x17/0x20
> [  666.929609]  __schedule+0x36/0x600
> [  666.929618]  ? trace_preempt_on+0x31/0x40
> [  666.929634]  do_task_dead+0x41/0x50
> [  666.929661]  make_task_dead+0xd3/0xe0
> [  666.929664]  rewind_stack_and_make_dead+0x17/0x18
> [  666.929702] RIP: 0033:0x7fad842c1846
> [  666.929705] Code: Unable to access opcode bytes at RIP 0x7fad842c181c.
> [  666.929706] RSP: 002b:00007ffe336ad8b8 EFLAGS: 00000246 ORIG_RAX:
> 00000000000000e7
> [  666.929709] RAX: ffffffffffffffda RBX: 00007fad845a9740 RCX: 00007fad8=
42c1846
> [  666.929710] RDX: 0000000000000000 RSI: 000000000000003c RDI: 000000000=
0000000
> [  666.929711] RBP: 0000000000000000 R08: 00000000000000e7 R09: fffffffff=
fffff80
> [  666.929712] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fad8=
45a9740
> [  666.929714] R13: 0000000000000001 R14: 00007fad845b2628 R15: 000000000=
0000000
> [  666.929717]  </TASK>
> [  666.929718] BUG: scheduling while atomic: mmapstress03/25230/0x0000000=
0
> [  666.929721] Modules linked in:
> [  666.929722] Preemption disabled at:
> [  666.929728] [<ffffffffaa82a574>] do_task_dead+0x24/0x50
> [  666.929733] CPU: 3 PID: 25230 Comm: mmapstress03 Tainted: G      D
>          5.18.0-rc6-next-20220513 #1
> [  666.929736] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [  666.929738] Call Trace:
> [  666.929739]  <TASK>
> [  666.929739]  dump_stack_lvl+0x6c/0x9a
> [  666.929743]  ? do_task_dead+0x24/0x50
> [  666.929747]  dump_stack+0x10/0x12
> [  666.929750]  __schedule_bug+0xd2/0x100
> [  666.929753]  __schedule+0x471/0x600
> [  666.929756]  ? trace_preempt_on+0x31/0x40
> [  666.929759]  do_task_dead+0x41/0x50
> [  666.929763]  make_task_dead+0xd3/0xe0
> [  666.929766]  rewind_stack_and_make_dead+0x17/0x18
> [  666.929768] RIP: 0033:0x7fad842c1846
> [  666.929771] Code: Unable to access opcode bytes at RIP 0x7fad842c181c.
> [  666.929772] RSP: 002b:00007ffe336ad8b8 EFLAGS: 00000246 ORIG_RAX:
> 00000000000000e7
> [  666.929774] RAX: ffffffffffffffda RBX: 00007fad845a9740 RCX: 00007fad8=
42c1846
> [  666.929775] RDX: 0000000000000000 RSI: 000000000000003c RDI: 000000000=
0000000
> [  666.929777] RBP: 0000000000000000 R08: 00000000000000e7 R09: fffffffff=
fffff80
> [  666.929778] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fad8=
45a9740
> [  666.929779] R13: 0000000000000001 R14: 00007fad845b2628 R15:
> 0000000000000000Running with 50*40 (=3D=3D 2000) tasks.
>=20
>=20
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
>=20
>=20
> metadata:
>   git_ref: master
>   git_repo: ''
>   git_sha: 1e1b28b936aed946122b4e0991e7144fdbbfd77e
>   git_describe: next-20220513
>   kernel_version: 5.18.0-rc6
>   kernel-config: https://builds.tuxbuild.com/296PqKcUcCQSykZbASUqmdlP33g/=
config
>   build-url: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next/-/pip=
elines/538244935
>   artifact-location: https://builds.tuxbuild.com/296PqKcUcCQSykZbASUqmdlP=
33g
>   toolchain: clang-12

I'm having an issue reproducing this on my configuration.  May be the
clang compiler though.  I'll keep digging.

>=20
> --
> Linaro LKFT
> https://lkft.linaro.org
>=20
> [1] https://lkft.validation.linaro.org/scheduler/job/5021584#L2916=