Re: [mm] db8d280d38: PANIC:early_exception

From: Vlastimil Babka
Date: Thu Oct 13 2022 - 04:51:33 EST

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On 10/13/22 10:38, Zhaoyang Huang wrote:
> @Vlastimil Could you please have an eye on this series of robot
> reports which are caused by stack_depot_init related issues. The
> problem arises from a very early access of stack_depot_save/init by
> kmemleak within setup_arch which happens even before
> stack_depot_early_init and zone related data ready. I would like to
> suggest adding a criteria at the entrance check of stack_depot_save
> which help the stackdepot API more aggregation and the caller free to
> call

>From the report it seems to me the problem is in your set_track_prepare():

+ if (!kmemleak_initialized)
+ stack_depot_init();

stack_depot_init() should be called only once and from well defined places,
this looks like neither condition is met.

> [ 0.062350][ T0] ? stack_depot_init.cold+0x5/0xbd
> [ 0.063072][ T0] ? set_track_prepare+0x6e/0x80
> [ 0.063957][ T0] ?
> __raw_callee_save___native_queued_spin_unlock+0x11/0x22
> [ 0.064952][ T0] ? write_comp_data+0x2a/0x80
> [ 0.065623][ T0] ? strncpy+0x2f/0x60
> [ 0.066205][ T0] ? __create_object+0x10c/0x3c0
> [ 0.066904][ T0] ? kmemleak_alloc_phys+0x6f/0x80
> [ 0.067561][ T0] ? memblock_alloc_range_nid+0x274/0x28f
> [ 0.068396][ T0] ? memblock_phys_alloc_range+0xa4/0xb3
> [ 0.069200][ T0] ? reserve_real_mode+0x87/0xd7
> [ 0.069895][ T0] ? setup_arch+0x6a9/0x995
> [ 0.070526][ T0] ? start_kernel+0x7c/0x854
> [ 0.071195][ T0] ? load_ucode_bsp+0x1bb/0x1c6
> [ 0.071875][ T0] ? secondary_startup_64_no_verify+0xe0/0xeb
> [ 0.072682][ T0] </TASK>
>
> On Thu, Oct 13, 2022 at 1:58 PM kernel test robot <oliver.sang@xxxxxxxxx> wrote:
>>
>>
>> Hi zhaoyang.huang,
>>
>> seems this is the fix based on our report
>> "[mm] 0e949320db: BUG:kernel_NULL_pointer_dereference,address"
>> at
>> https://lore.kernel.org/all/202210121406.d4ebc9bc-oliver.sang@xxxxxxxxx/
>> but now it seems have new issue. report FYI
>>
>>
>> Greeting,
>>
>> FYI, we noticed the following commit (built with gcc-11):
>>
>> commit: db8d280d38efb061ad1a57ce060cbb917a4cf503 ("[RFC PATCHv2] 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/20221012-160458
>> base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-everything
>> patch link: https://lore.kernel.org/linux-mm/1665561689-29498-1-git-send-email-zhaoyang.huang@xxxxxxxxxx
>> patch subject: [RFC PATCHv2] 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):
>>
>>
>> +-------------------------------+------------+------------+
>> | | 95f1b43741 | db8d280d38 |
>> +-------------------------------+------------+------------+
>> | boot_successes | 20 | 0 |
>> | boot_failures | 0 | 18 |
>> | PANIC:early_exception | 0 | 18 |
>> | RIP:nr_free_zone_pages | 0 | 18 |
>> | BUG:kernel_hang_in_boot_stage | 0 | 18 |
>> +-------------------------------+------------+------------+
>>
>>
>> If you fix the issue, kindly add following tag
>> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
>> | Link: https://lore.kernel.org/r/202210131309.fe5427b-oliver.sang@xxxxxxxxx
>>
>>
>> [ 0.029254][ T0] Scan for SMP in [mem 0x00000000-0x000003ff]
>> [ 0.030178][ T0] Scan for SMP in [mem 0x0009fc00-0x0009ffff]
>> [ 0.031080][ T0] Scan for SMP in [mem 0x000f0000-0x000fffff]
>> [ 0.043370][ T0] found SMP MP-table at [mem 0x000f5ba0-0x000f5baf]
>> [ 0.044301][ T0] mpc: f5bb0-f5c80
>> PANIC: early exception 0x0e IP 10:ffffffff8149c282 error 0 cr2 0x1e08
>> [ 0.045770][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc3-00711-gdb8d280d38ef #5
>> [ 0.046970][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
>> [ 0.048356][ T0] RIP: 0010:nr_free_zone_pages (kbuild/src/x86_64-2/include/linux/mmzone.h:1478 kbuild/src/x86_64-2/include/linux/mmzone.h:1504 kbuild/src/x86_64-2/mm/page_alloc.c:5886)
>> [ 0.049158][ T0] Code: e9 a3 5c 0b 00 0f 1f 00 e8 9b cd be ff 65 8b 05 14 b8 b8 7e 48 98 41 54 48 8b 04 c5 e0 e4 bc 83 53 89 fb 4c 8d 80 00 1e 00 00 <3b> b8 08 1e 00 00 72 5b 49 8b 10 45 31 e4 48 85 d2 75 05 eb 35 49
>> All code
>> ========
>> 0: e9 a3 5c 0b 00 jmpq 0xb5ca8
>> 5: 0f 1f 00 nopl (%rax)
>> 8: e8 9b cd be ff callq 0xffffffffffbecda8
>> d: 65 8b 05 14 b8 b8 7e mov %gs:0x7eb8b814(%rip),%eax # 0x7eb8b828
>> 14: 48 98 cltq
>> 16: 41 54 push %r12
>> 18: 48 8b 04 c5 e0 e4 bc mov -0x7c431b20(,%rax,8),%rax
>> 1f: 83
>> 20: 53 push %rbx
>> 21: 89 fb mov %edi,%ebx
>> 23: 4c 8d 80 00 1e 00 00 lea 0x1e00(%rax),%r8
>> 2a:* 3b b8 08 1e 00 00 cmp 0x1e08(%rax),%edi <-- trapping instruction
>> 30: 72 5b jb 0x8d
>> 32: 49 8b 10 mov (%r8),%rdx
>> 35: 45 31 e4 xor %r12d,%r12d
>> 38: 48 85 d2 test %rdx,%rdx
>> 3b: 75 05 jne 0x42
>> 3d: eb 35 jmp 0x74
>> 3f: 49 rex.WB
>>
>> Code starting with the faulting instruction
>> ===========================================
>> 0: 3b b8 08 1e 00 00 cmp 0x1e08(%rax),%edi
>> 6: 72 5b jb 0x63
>> 8: 49 8b 10 mov (%r8),%rdx
>> b: 45 31 e4 xor %r12d,%r12d
>> e: 48 85 d2 test %rdx,%rdx
>> 11: 75 05 jne 0x18
>> 13: eb 35 jmp 0x4a
>> 15: 49 rex.WB
>> [ 0.051803][ T0] RSP: 0000:ffffffff83603d18 EFLAGS: 00010046 ORIG_RAX: 0000000000000000
>> [ 0.052881][ T0] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0001ffff84b317e0
>> [ 0.053932][ T0] RDX: 0000000000000485 RSI: 0001ffffffffffff RDI: 0000000000000002
>> [ 0.055007][ T0] RBP: ffffffff84b077d0 R08: 0000000000001e00 R09: 0000000000000000
>> [ 0.056054][ T0] R10: ffffffff81b16d30 R11: 0001ffff84b317e8 R12: 0000000000000001
>> [ 0.057088][ T0] R13: ffffffff84b077d8 R14: 0000000000098000 R15: 0000000000007000
>> [ 0.058160][ T0] FS: 0000000000000000(0000) GS:ffffffff842c9000(0000) knlGS:0000000000000000
>> [ 0.059440][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 0.060381][ T0] CR2: 0000000000001e08 CR3: 00000000043b6000 CR4: 00000000000406a0
>> [ 0.061516][ T0] Call Trace:
>> [ 0.061969][ T0] <TASK>
>> [ 0.062350][ T0] ? stack_depot_init.cold (kbuild/src/x86_64-2/lib/stackdepot.c:258)
>> [ 0.063072][ T0] ? set_track_prepare (kbuild/src/x86_64-2/mm/slub.c:752)
>> [ 0.063957][ T0] ? __raw_callee_save___native_queued_spin_unlock (??:?)
>> [ 0.064952][ T0] ? write_comp_data (kbuild/src/x86_64-2/kernel/kcov.c:236)
>>
>>
>> To reproduce:
>>
>> # build kernel
>> cd linux
>> cp config-6.0.0-rc3-00711-gdb8d280d38ef .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
>>
>>

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Previous message: Icenowy Zheng: "Re: [PATCH v2 04/10] phy: sun4i-usb: add support for the USB PHY on F1C100s SoC"
In reply to: Zhaoyang Huang: "Re: [mm] db8d280d38: PANIC:early_exception"
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