Re: [mm] 0e949320db: BUG:kernel_NULL_pointer_dereference,address

From: Zhaoyang Huang
Date: Wed Oct 12 2022 - 03:37:39 EST

Next message: Niklas Schnelle: "Re: [PATCH v3 09/11] s390: mm: Convert to GENERIC_IOREMAP"
Previous message: Angus Chen: "RE: [GIT PULL] virtio: fixes, features"
In reply to: Zhaoyang Huang: "Re: [Resend PATCH] mm: use stack_depot for recording kmemleak's backtrace"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This is introduced by a very early kmemleak_alloc before kmemleak_init
which gets an object from mem_pool, which could not be produced on my
v5.4 based environment, sorry for the disturbance. I would like to
send a fixup later.

On Wed, Oct 12, 2022 at 2:34 PM kernel test robot <oliver.sang@xxxxxxxxx> wrote:
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-11):
>
> commit: 0e949320dbee7ffe242b1a9b4fc59661e954e6e5 ("[Resend PATCH] mm: use stack_depot for recording kmemleak's backtrace")
> url: https://github.com/intel-lab-lkp/linux/commits/zhaoyang-huang/mm-use-stack_depot-for-recording-kmemleak-s-backtrace/20221011-091833
> base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-everything
> patch link: https://lore.kernel.org/linux-mm/1665450964-27487-1-git-send-email-zhaoyang.huang@xxxxxxxxxx
> patch subject: [Resend PATCH] mm: use stack_depot for recording kmemleak's backtrace
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +---------------------------------------------+------------+------------+
> | | 029cc2b410 | 0e949320db |
> +---------------------------------------------+------------+------------+
> | boot_successes | 6 | 0 |
> | boot_failures | 0 | 6 |
> | BUG:kernel_NULL_pointer_dereference,address | 0 | 6 |
> | Oops:#[##] | 0 | 6 |
> | RIP:__stack_depot_save | 0 | 6 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 6 |
> +---------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> | Link: https://lore.kernel.org/r/202210121406.d4ebc9bc-oliver.sang@xxxxxxxxx
>
>
> [ 0.244585][ T0] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [ 0.246464][ T0] #PF: supervisor read access in kernel mode
> [ 0.247823][ T0] #PF: error_code(0x0000) - not-present page
> [ 0.249179][ T0] PGD 0 P4D 0
> [ 0.249986][ T0] Oops: 0000 [#1] SMP PTI
> [ 0.251025][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc3-00707-g0e949320dbee #4
> [ 0.252895][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
> [ 0.255242][ T0] RIP: 0010:__stack_depot_save (kbuild/src/x86_64-2/lib/stackdepot.c:452)
> [ 0.256583][ T0] Code: 03 48 c7 c7 ec 17 b3 84 e8 91 e8 85 ff 44 89 e0 23 05 74 a8 01 03 48 8d 04 c3 48 89 c3 48 89 c7 48 89 44 24 28 e8 d4 f9 85 ff <4c> 8b 33 4d 85 f6 0f 84 b6 00 00 00 8b 04 24 83 e8 01 48 8d 04 c5
> All code
> ========
> 0: 03 48 c7 add -0x39(%rax),%ecx
> 3: c7 (bad)
> 4: ec in (%dx),%al
> 5: 17 (bad)
> 6: b3 84 mov $0x84,%bl
> 8: e8 91 e8 85 ff callq 0xffffffffff85e89e
> d: 44 89 e0 mov %r12d,%eax
> 10: 23 05 74 a8 01 03 and 0x301a874(%rip),%eax # 0x301a88a
> 16: 48 8d 04 c3 lea (%rbx,%rax,8),%rax
> 1a: 48 89 c3 mov %rax,%rbx
> 1d: 48 89 c7 mov %rax,%rdi
> 20: 48 89 44 24 28 mov %rax,0x28(%rsp)
> 25: e8 d4 f9 85 ff callq 0xffffffffff85f9fe
> 2a:* 4c 8b 33 mov (%rbx),%r14 <-- trapping instruction
> 2d: 4d 85 f6 test %r14,%r14
> 30: 0f 84 b6 00 00 00 je 0xec
> 36: 8b 04 24 mov (%rsp),%eax
> 39: 83 e8 01 sub $0x1,%eax
> 3c: 48 rex.W
> 3d: 8d .byte 0x8d
> 3e: 04 c5 add $0xc5,%al
>
> Code starting with the faulting instruction
> ===========================================
> 0: 4c 8b 33 mov (%rbx),%r14
> 3: 4d 85 f6 test %r14,%r14
> 6: 0f 84 b6 00 00 00 je 0xc2
> c: 8b 04 24 mov (%rsp),%eax
> f: 83 e8 01 sub $0x1,%eax
> 12: 48 rex.W
> 13: 8d .byte 0x8d
> 14: 04 c5 add $0xc5,%al
> [ 0.261023][ T0] RSP: 0000:ffffffff83603ca8 EFLAGS: 00010046
> [ 0.262337][ T0] RAX: ffffffff83613cd8 RBX: 0000000000000000 RCX: ffffffff81b16f8c
> [ 0.264139][ T0] RDX: 0000000000000b64 RSI: 0000000000000000 RDI: 0000000000000000
> [ 0.265948][ T0] RBP: 00000000c5a6b597 R08: ffffffff8479d118 R09: 0000000000000000
> [ 0.267668][ T0] R10: 0000000000000004 R11: 0001ffffffffffff R12: 0000000027b2cd0a
> [ 0.269492][ T0] R13: 0000000000000003 R14: 000000004954f68c R15: ffffffff83603d54
> [ 0.271315][ T0] FS: 0000000000000000(0000) GS:ffffffff842c9000(0000) knlGS:0000000000000000
> [ 0.273215][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 0.274736][ T0] CR2: 0000000000000000 CR3: 000000000360a000 CR4: 00000000000406b0
> [ 0.276558][ T0] Call Trace:
> [ 0.277339][ T0] <TASK>
> [ 0.278031][ T0] stack_depot_save (kbuild/src/x86_64-2/lib/stackdepot.c:534)
> [ 0.279163][ T0] set_track_prepare (kbuild/src/x86_64-2/mm/slub.c:752)
> [ 0.280296][ T0] ? memblock_alloc_range_nid (kbuild/src/x86_64-2/mm/memblock.c:1424)
> [ 0.281692][ T0] ? memblock_alloc_internal (kbuild/src/x86_64-2/mm/memblock.c:1514)
> [ 0.282985][ T0] ? memblock_alloc_try_nid (kbuild/src/x86_64-2/mm/memblock.c:1614 (discriminator 3))
> [ 0.286557][ T0] ? setup_command_line (kbuild/src/x86_64-2/init/main.c:631)
> [ 0.287706][ T0] ? start_kernel (kbuild/src/x86_64-2/init/main.c:965)
> [ 0.288803][ T0] ? secondary_startup_64_no_verify (kbuild/src/x86_64-2/arch/x86/kernel/head_64.S:358)
> [ 0.290257][ T0] ? __raw_callee_save___native_queued_spin_unlock (??:?)
> [ 0.291867][ T0] ? write_comp_data (kbuild/src/x86_64-2/kernel/kcov.c:236)
> [ 0.292883][ T0] ? strncpy (kbuild/src/x86_64-2/lib/string.c:115)
> [ 0.293763][ T0] __create_object (kbuild/src/x86_64-2/mm/kmemleak.c:681)
> [ 0.294761][ T0] kmemleak_alloc_phys (kbuild/src/x86_64-2/mm/kmemleak.c:1212)
> [ 0.295882][ T0] memblock_alloc_range_nid (kbuild/src/x86_64-2/mm/memblock.c:1424)
> [ 0.297105][ T0] memblock_alloc_internal (kbuild/src/x86_64-2/mm/memblock.c:1514)
> [ 0.298293][ T0] memblock_alloc_try_nid (kbuild/src/x86_64-2/mm/memblock.c:1614 (discriminator 3))
> [ 0.299516][ T0] setup_command_line (kbuild/src/x86_64-2/init/main.c:631)
> [ 0.300691][ T0] start_kernel (kbuild/src/x86_64-2/init/main.c:965)
> [ 0.301806][ T0] ? load_ucode_bsp (kbuild/src/x86_64-2/arch/x86/kernel/cpu/microcode/core.c:176)
> [ 0.302954][ T0] secondary_startup_64_no_verify (kbuild/src/x86_64-2/arch/x86/kernel/head_64.S:358)
> [ 0.304315][ T0] </TASK>
> [ 0.305039][ T0] Modules linked in:
> [ 0.305938][ T0] CR2: 0000000000000000
> [ 0.306882][ T0] ---[ end trace 0000000000000000 ]---
> [ 0.307913][ T0] RIP: 0010:__stack_depot_save (kbuild/src/x86_64-2/lib/stackdepot.c:452)
> [ 0.309033][ T0] Code: 03 48 c7 c7 ec 17 b3 84 e8 91 e8 85 ff 44 89 e0 23 05 74 a8 01 03 48 8d 04 c3 48 89 c3 48 89 c7 48 89 44 24 28 e8 d4 f9 85 ff <4c> 8b 33 4d 85 f6 0f 84 b6 00 00 00 8b 04 24 83 e8 01 48 8d 04 c5
> All code
> ========
> 0: 03 48 c7 add -0x39(%rax),%ecx
> 3: c7 (bad)
> 4: ec in (%dx),%al
> 5: 17 (bad)
> 6: b3 84 mov $0x84,%bl
> 8: e8 91 e8 85 ff callq 0xffffffffff85e89e
> d: 44 89 e0 mov %r12d,%eax
> 10: 23 05 74 a8 01 03 and 0x301a874(%rip),%eax # 0x301a88a
> 16: 48 8d 04 c3 lea (%rbx,%rax,8),%rax
> 1a: 48 89 c3 mov %rax,%rbx
> 1d: 48 89 c7 mov %rax,%rdi
> 20: 48 89 44 24 28 mov %rax,0x28(%rsp)
> 25: e8 d4 f9 85 ff callq 0xffffffffff85f9fe
> 2a:* 4c 8b 33 mov (%rbx),%r14 <-- trapping instruction
> 2d: 4d 85 f6 test %r14,%r14
> 30: 0f 84 b6 00 00 00 je 0xec
> 36: 8b 04 24 mov (%rsp),%eax
> 39: 83 e8 01 sub $0x1,%eax
> 3c: 48 rex.W
> 3d: 8d .byte 0x8d
> 3e: 04 c5 add $0xc5,%al
>
> Code starting with the faulting instruction
> ===========================================
> 0: 4c 8b 33 mov (%rbx),%r14
> 3: 4d 85 f6 test %r14,%r14
> 6: 0f 84 b6 00 00 00 je 0xc2
> c: 8b 04 24 mov (%rsp),%eax
> f: 83 e8 01 sub $0x1,%eax
> 12: 48 rex.W
> 13: 8d .byte 0x8d
> 14: 04 c5 add $0xc5,%al
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-6.0.0-rc3-00707-g0e949320dbee .config
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 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://github.com/intel/lkp-tests.git
> 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.
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
>
>

Next message: Niklas Schnelle: "Re: [PATCH v3 09/11] s390: mm: Convert to GENERIC_IOREMAP"
Previous message: Angus Chen: "RE: [GIT PULL] virtio: fixes, features"
In reply to: Zhaoyang Huang: "Re: [Resend PATCH] mm: use stack_depot for recording kmemleak's backtrace"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]