Re: selftests: memfd: run_hugetlbfs_test.sh - invalid opcode: 0000 [#1] PREEMPT SMP

[Mike Kravetz]

On 01/05/23 15:14, Naresh Kamboju wrote:
> While running selftests: memfd: run_hugetlbfs_test.sh on qemu_i386 and i386 the
> following invalid opcode was noticed on stable-rc 6.1 and  6.0.
> 
> This is always reproducible on stable-rc 6.1 and  6.0 with qemu_i386 and i386.
> Build, config and test log details provided in the below links [1].

Hello Naresh,

I have tried to create this issue a few times without success.  Since I
do not have i386 HW, I am using qemu_i386.  If I use the supplied config,
my kernel does not boot.  I then try to modify config options which I
think are not relevant.  By the time I get to a config that will boot, I
can not recreate the issue. :(

Just curious if you have any suggestions?  Or, Wondering if anyone else has
suggestions on how to proceed?
-- 
Mike Kravetz

> 
> Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> 
> # selftests: memfd: run_hugetlbfs_test.sh
> [  111.866742] run_hugetlbfs_t (1023): drop_caches: 3
> [  111.892484] invalid opcode: 0000 [#1] PREEMPT SMP
> [  111.893089] CPU: 2 PID: 1026 Comm: memfd_test Tainted: G
>      N 6.1.4-rc1 #1
> [  111.894015] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [  111.895048] EIP: hugetlb_file_setup.cold+0x0/0x33
> [  111.895597] Code: ff e9 07 f3 26 ff 0f 0b c7 04 24 c8 ee dd c9 e8
> 25 47 ff ff b8 ea ff ff ff e9 ac f8 26 ff 0f 0b 0f 0b 0f 0b 0f 0b 0f
> 0b 0f 0b <0f> 0b 64 a1 98 48 3a ca c6 05 f3 42 22 ca 01 8b 90 d4 03 00
> 00 05
> [  111.897716] EAX: c4957128 EBX: 00000000 ECX: 00000020 EDX: 00000000
> [  111.898431] ESI: 80000004 EDI: 00000005 EBP: c552bf04 ESP: c552bee4
> [  111.899218] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00010212
> [  111.899991] CR0: 80050033 CR2: 00000000 CR3: 0528b000 CR4: 003506d0
> [  111.900774] Call Trace:
> [  111.901072]  __ia32_sys_memfd_create+0x196/0x220
> [  111.901616]  __do_fast_syscall_32+0x77/0xd0
> [  111.902119]  do_fast_syscall_32+0x32/0x70
> [  111.902620]  do_SYSENTER_32+0x15/0x20
> [  111.903134]  entry_SYSENTER_32+0x98/0xf6
> [  111.903701] EIP: 0xb7ef1549
> [  111.904034] Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01
> 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f
> 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90
> 8d 76
> [  111.906124] EAX: ffffffda EBX: 0804b486 ECX: 80000004 EDX: 080493de
> [  111.906902] ESI: b7ccf220 EDI: b7dc58e0 EBP: bfe56cf8 ESP: bfe56c8c
> [  111.907637] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000292
> [  111.908502] Modules linked in: sch_fq_codel fuse configfs [last
> unloaded: test_strscpy(N)]
> [  111.909502] ---[ end trace 0000000000000000 ]---
> [  111.910064] EIP: hugetlb_file_setup.cold+0x0/0x33
> [  111.910638] Code: ff e9 07 f3 26 ff 0f 0b c7 04 24 c8 ee dd c9 e8
> 25 47 ff ff b8 ea ff ff ff e9 ac f8 26 ff 0f 0b 0f 0b 0f 0b 0f 0b 0f
> 0b 0f 0b <0f> 0b 64 a1 98 48 3a ca c6 05 f3 42 22 ca 01 8b 90 d4 03 00
> 00 05
> [  111.912785] EAX: c4957128 EBX: 00000000 ECX: 00000020 EDX: 00000000
> [  111.913518] ESI: 80000004 EDI: 00000005 EBP: c552bf04 ESP: c552bee4
> [  111.914259] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00010212
> [  111.915104] CR0: 80050033 CR2: 00000000 CR3: 0528b000 CR4: 003506d0
> # ./run_hugetlbfs_test.sh: line 60:  1026 Segmentation fault
> ./memfd_test hugetlbfs
> # opening: ./mnt/memfd
> # fuse: DONE
> ok 3 selftests: memfd: run_hugetlbfs_test.sh
> 
> [1]
> https://lkft.validation.linaro.org/scheduler/job/6022150#L2079
> https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.1.y/build/v6.1.3-208-ga31425cbf493/testrun/13974189/suite/log-parser-test/tests/
> https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.1.y/build/v6.1.3-208-ga31425cbf493/testrun/13974189/suite/log-parser-test/test/check-kernel-invalid-opcode/details/
> 
> metadata:
>   git_ref: linux-6.1.y
>   git_repo: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc
>   git_sha: a31425cbf493ef8bc7f7ce775a1028b1e0612f32
>   git_describe: v6.1.3-208-ga31425cbf493
>   kernel_version: 6.1.4-rc1
>   kernel-config:
> https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzvZc223pctlAxVhCIebJ8q0w/config
>   build-url: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc/-/pipelines/738268273
>   artifact-location:
> https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzvZc223pctlAxVhCIebJ8q0w
>   toolchain: gcc-11
>   vmlinux: https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzvZc223pctlAxVhCIebJ8q0w/vmlinux.xz
>   System.map: https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzvZc223pctlAxVhCIebJ8q0w/System.map
> 
> --
> Linaro LKFT
> https://lkft.linaro.org