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SubjectRE: [drm/selftests] 39ec47bbfd: kernel_BUG_at_drivers/gpu/drm/drm_buddy.c
Date
[AMD Official Use Only]

Hi Christian,
I will check

Thanks,
Arun
-----Original Message-----
From: Koenig, Christian <Christian.Koenig@amd.com>
Sent: Monday, February 28, 2022 4:29 PM
To: kernel test robot <oliver.sang@intel.com>; Paneer Selvam, Arunpravin <Arunpravin.PaneerSelvam@amd.com>
Cc: 0day robot <lkp@intel.com>; Matthew Auld <matthew.auld@intel.com>; LKML <linux-kernel@vger.kernel.org>; lkp@lists.01.org; dri-devel@lists.freedesktop.org; intel-gfx@lists.freedesktop.org; amd-gfx@lists.freedesktop.org; tzimmermann@suse.de; Deucher, Alexander <Alexander.Deucher@amd.com>
Subject: Re: [drm/selftests] 39ec47bbfd: kernel_BUG_at_drivers/gpu/drm/drm_buddy.c

Arun can you take a look at that one here?

It looks like a real problem to me and not just a potential false negative like the other issue.

Thanks,
Christian.

Am 27.02.22 um 16:18 schrieb kernel test robot:
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 39ec47bbfd5dd3cea0b711ee9f1acdca37399c86 ("[PATCH v2 2/7]
> drm/selftests: add drm buddy alloc limit testcase")
> url:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
> ub.com%2F0day-ci%2Flinux%2Fcommits%2FArunpravin%2Fdrm-selftests-Move-i
> 915-buddy-selftests-into-drm%2F20220223-015043&amp;data=04%7C01%7Cchri
> stian.koenig%40amd.com%7C3101ff318a994e6eaf5f08d9fa0481ea%7C3dd8961fe4
> 884e608e11a82d994e183d%7C0%7C0%7C637815719552700496%7CUnknown%7CTWFpbG
> Zsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%
> 3D%7C3000&amp;sdata=sKvsDtHufRMfSO14HdmHxvNsJiPyDZVDXCFUpWTDwFI%3D&amp
> ;reserved=0 patch link:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore
> .kernel.org%2Fdri-devel%2F20220222174845.2175-2-Arunpravin.PaneerSelva
> m%40amd.com&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C3101ff318a
> 994e6eaf5f08d9fa0481ea%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C63
> 7815719552700496%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV
> 2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=aWG4x27aMLcOySO
> UkHbLQ1NL9L8t8AF4dgXux65IIP8%3D&amp;reserved=0
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu Icelake-Server
> -smp 4 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +---------------------------------------------------+------------+------------+
> | | be9e8c6c00 |
> | 39ec47bbfd |
> +---------------------------------------------------+------------+------------+
> | boot_successes | 14 | 0 |
> | boot_failures | 0 | 16 |
> | UBSAN:shift-out-of-bounds_in_include/linux/log2.h | 0 | 16 |
> | kernel_BUG_at_drivers/gpu/drm/drm_buddy.c | 0 | 16 |
> | invalid_opcode:#[##] | 0 | 16 |
> | EIP:drm_buddy_init | 0 | 16 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 16 |
> +---------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@intel.com>
>
>
> [ 68.124177][ T1] UBSAN: shift-out-of-bounds in include/linux/log2.h:67:13
> [ 68.125333][ T1] shift exponent 4294967295 is too large for 32-bit type 'long unsigned int'
> [ 68.126563][ T1] CPU: 0 PID: 1 Comm: swapper Not tainted 5.17.0-rc2-00311-g39ec47bbfd5d #2
> [ 68.127758][ T1] Call Trace:
> [ 68.128187][ T1] dump_stack_lvl (lib/dump_stack.c:108) [ 68.128793][
> T1] dump_stack (lib/dump_stack.c:114) [ 68.129331][ T1] ubsan_epilogue
> (lib/ubsan.c:152) [ 68.129958][ T1]
> __ubsan_handle_shift_out_of_bounds.cold
> (arch/x86/include/asm/smap.h:85) [ 68.130791][ T1] ?
> drm_block_alloc+0x28/0x80 [ 68.131582][ T1] ? rcu_read_lock_sched_held
> (kernel/rcu/update.c:125) [ 68.132215][ T1] ? kmem_cache_alloc
> (include/trace/events/kmem.h:54 mm/slab.c:3501) [ 68.132878][ T1] ?
> mark_free+0x2e/0x80 [ 68.133524][ T1] drm_buddy_init.cold
> (include/linux/log2.h:67 drivers/gpu/drm/drm_buddy.c:131) [
> 68.134145][ T1] ? test_drm_cmdline_init
> (drivers/gpu/drm/selftests/test-drm_buddy.c:87)
> [ 68.134770][ T1] igt_buddy_alloc_limit
> (drivers/gpu/drm/selftests/test-drm_buddy.c:30)
> [ 68.135472][ T1] ? vprintk_default (kernel/printk/printk.c:2257) [
> 68.136057][ T1] ? test_drm_cmdline_init
> (drivers/gpu/drm/selftests/test-drm_buddy.c:87)
> [ 68.136812][ T1] test_drm_buddy_init
> (drivers/gpu/drm/selftests/drm_selftest.c:77
> drivers/gpu/drm/selftests/test-drm_buddy.c:95)
> [ 68.137475][ T1] do_one_initcall (init/main.c:1300) [ 68.138111][ T1]
> ? parse_args (kernel/params.c:609 kernel/params.c:146
> kernel/params.c:188) [ 68.138717][ T1] do_basic_setup
> (init/main.c:1372 init/main.c:1389 init/main.c:1408) [ 68.139366][ T1]
> kernel_init_freeable (init/main.c:1617) [ 68.140040][ T1] ? rest_init
> (init/main.c:1494) [ 68.140634][ T1] kernel_init (init/main.c:1504) [
> 68.141155][ T1] ret_from_fork (arch/x86/entry/entry_32.S:772)
> [ 68.141607][ T1] ================================================================================
> [ 68.146730][ T1] ------------[ cut here ]------------
> [ 68.147460][ T1] kernel BUG at drivers/gpu/drm/drm_buddy.c:140!
> [ 68.148280][ T1] invalid opcode: 0000 [#1]
> [ 68.148895][ T1] CPU: 0 PID: 1 Comm: swapper Not tainted 5.17.0-rc2-00311-g39ec47bbfd5d #2
> [ 68.149896][ T1] EIP: drm_buddy_init (drivers/gpu/drm/drm_buddy.c:140
> (discriminator 1)) [ 68.149896][ T1] Code: 76 00 b8 ea ff ff ff 8d 65
> f4 5b 5e 5f 5d c3 8d 76 00 0f bd 45 d8 75 05 b8 ff ff ff ff 83 c0 21
> e9 5e ff ff ff 8d 74 26 00 90 <0f> 0b 8d b6 00 00 00 00 0f 0b 8d b6 00 00 00 00 8b 5d 0c 0f bd 45 All code ========
> 0: 76 00 jbe 0x2
> 2: b8 ea ff ff ff mov $0xffffffea,%eax
> 7: 8d 65 f4 lea -0xc(%rbp),%esp
> a: 5b pop %rbx
> b: 5e pop %rsi
> c: 5f pop %rdi
> d: 5d pop %rbp
> e: c3 retq
> f: 8d 76 00 lea 0x0(%rsi),%esi
> 12: 0f bd 45 d8 bsr -0x28(%rbp),%eax
> 16: 75 05 jne 0x1d
> 18: b8 ff ff ff ff mov $0xffffffff,%eax
> 1d: 83 c0 21 add $0x21,%eax
> 20: e9 5e ff ff ff jmpq 0xffffffffffffff83
> 25: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi
> 29: 90 nop
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 32: 0f 0b ud2
> 34: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 3a: 8b 5d 0c mov 0xc(%rbp),%ebx
> 3d: 0f .byte 0xf
> 3e: bd .byte 0xbd
> 3f: 45 rex.RB
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 8: 0f 0b ud2
> a: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 10: 8b 5d 0c mov 0xc(%rbp),%ebx
> 13: 0f .byte 0xf
> 14: bd .byte 0xbd
> 15: 45 rex.RB
> [ 68.149896][ T1] EAX: 8578e658 EBX: 8578e618 ECX: 8578e658 EDX: 83717c98
> [ 68.149896][ T1] ESI: 83675ee0 EDI: 00000034 EBP: 83675ec0 ESP: 83675e94
> [ 68.149896][ T1] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010297
> [ 68.149896][ T1] CR0: 80050033 CR2: 77f35844 CR3: 02a10000 CR4: 00150ed0
> [ 68.149896][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 68.149896][ T1] DR6: fffe0ff0 DR7: 00000400
> [ 68.149896][ T1] Call Trace:
> [ 68.149896][ T1] ? test_drm_cmdline_init
> (drivers/gpu/drm/selftests/test-drm_buddy.c:87)
> [ 68.149896][ T1] igt_buddy_alloc_limit
> (drivers/gpu/drm/selftests/test-drm_buddy.c:30)
> [ 68.149896][ T1] ? vprintk_default (kernel/printk/printk.c:2257) [
> 68.149896][ T1] ? test_drm_cmdline_init
> (drivers/gpu/drm/selftests/test-drm_buddy.c:87)
> [ 68.149896][ T1] test_drm_buddy_init
> (drivers/gpu/drm/selftests/drm_selftest.c:77
> drivers/gpu/drm/selftests/test-drm_buddy.c:95)
> [ 68.149896][ T1] do_one_initcall (init/main.c:1300) [ 68.149896][ T1]
> ? parse_args (kernel/params.c:609 kernel/params.c:146
> kernel/params.c:188) [ 68.149896][ T1] do_basic_setup
> (init/main.c:1372 init/main.c:1389 init/main.c:1408) [ 68.149896][ T1]
> kernel_init_freeable (init/main.c:1617) [ 68.149896][ T1] ? rest_init
> (init/main.c:1494) [ 68.149896][ T1] kernel_init (init/main.c:1504) [
> 68.149896][ T1] ret_from_fork (arch/x86/entry/entry_32.S:772)
> [ 68.149896][ T1] Modules linked in:
> [ 68.167316][ T1] ---[ end trace 0000000000000000 ]---
> [ 68.168062][ T1] EIP: drm_buddy_init (drivers/gpu/drm/drm_buddy.c:140
> (discriminator 1)) [ 68.168739][ T1] Code: 76 00 b8 ea ff ff ff 8d 65
> f4 5b 5e 5f 5d c3 8d 76 00 0f bd 45 d8 75 05 b8 ff ff ff ff 83 c0 21
> e9 5e ff ff ff 8d 74 26 00 90 <0f> 0b 8d b6 00 00 00 00 0f 0b 8d b6 00 00 00 00 8b 5d 0c 0f bd 45 All code ========
> 0: 76 00 jbe 0x2
> 2: b8 ea ff ff ff mov $0xffffffea,%eax
> 7: 8d 65 f4 lea -0xc(%rbp),%esp
> a: 5b pop %rbx
> b: 5e pop %rsi
> c: 5f pop %rdi
> d: 5d pop %rbp
> e: c3 retq
> f: 8d 76 00 lea 0x0(%rsi),%esi
> 12: 0f bd 45 d8 bsr -0x28(%rbp),%eax
> 16: 75 05 jne 0x1d
> 18: b8 ff ff ff ff mov $0xffffffff,%eax
> 1d: 83 c0 21 add $0x21,%eax
> 20: e9 5e ff ff ff jmpq 0xffffffffffffff83
> 25: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi
> 29: 90 nop
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 32: 0f 0b ud2
> 34: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 3a: 8b 5d 0c mov 0xc(%rbp),%ebx
> 3d: 0f .byte 0xf
> 3e: bd .byte 0xbd
> 3f: 45 rex.RB
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 8: 0f 0b ud2
> a: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
> 10: 8b 5d 0c mov 0xc(%rbp),%ebx
> 13: 0f .byte 0xf
> 14: bd .byte 0xbd
> 15: 45 rex.RB
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.17.0-rc2-00311-g39ec47bbfd5d .config
> make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
> cd <mod-install-dir>
> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
>
>
> git clone https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fintel%2Flkp-tests.git&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C3101ff318a994e6eaf5f08d9fa0481ea%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637815719552700496%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=NjykC%2F60KxU7%2FmTnzNMNzJReXV06mjFzQPvDM1Pyj%2F4%3D&amp;reserved=0
> cd lkp-tests
> bin/lkp qemu -k <bzImage> -m modules.cgz job-script #
> job-script is attached in this email
>
> # if come across any failure that blocks the test,
> # please remove ~/.lkp and /lkp dir to run from a clean state.
>
>
>
> ---
> 0DAY/LKP+ Test Infrastructure Open Source Technology Center
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.01.org%2Fhyperkitty%2Flist%2Flkp%40lists.01.org&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C3101ff318a994e6eaf5f08d9fa0481ea%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637815719552700496%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=v8BQLwbrizBXoDoHb77IgXjPnvrF%2BomFQpmhNYXa8i0%3D&amp;reserved=0 Intel Corporation
>
> Thanks,
> Oliver Sang
>
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