Re: [PATCH RFC 2/2] mm/page_alloc: free_pcppages_bulk clean up

From: Chris Li
Date: Thu Aug 24 2023 - 11:26:06 EST

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Hi Oliver,

Indeed, that is my bad. Thanks for reporting it.

The patch has been sitting in my tree for a very long time.
When I adopt it for the later kernel, I accidentally drop this chunk:

- if (!list_empty(list))
- break;

I think that is what is missing. I will address that in the V2 and do
more testing before I send it out.

On Wed, Aug 23, 202

>
> in testcase: boot
>
> compiler: gcc-12
> test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)

The kernel test robot is very interesting.
I see that is how to start the qemu system.

How do I invoke the test once I have qemu up and running with my testing kernel?

I want to replicate it before I send out the V2 version.

Chris

>
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202308241221.cc5ac84a-oliver.sang@xxxxxxxxx
>
>
>
> [ 15.890907][ C0] BUG: kernel NULL pointer dereference, address: 00000005
> [ 15.891555][ C0] #PF: supervisor read access in kernel mode
> [ 15.892037][ C0] #PF: error_code(0x0000) - not-present page
> [ 15.893161][ C0] *pdpt = 000000002c9e7001 *pde = 0000000000000000
> [ 15.894410][ C0] Oops: 0000 [#1] SMP PTI
> [ 15.895385][ C0] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G E 6.5.0-rc4-00242-g3373e582e78e #1
> [ 15.896801][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> [ 15.898250][ C0] EIP: free_pcppages_bulk+0x7d/0x200
> [ 15.899281][ C0] Code: 8d 34 c6 89 75 e4 83 f8 0c 0f 84 ee 00 00 00 ba ab aa aa aa f7 e2 b8 01 00 00 00 89 d1 d1 e9 d3 e0 89 45 e0 8b 45 e4 8b 50 04 <8b> 72 04
> 8d 5a fc 83 ee 04 39 c2 0f 84 0a 01 00 00 89 4d e8 eb 28
> [ 15.914130][ C0] EAX: e4c7520c EBX: e4c9f510 ECX: 55555555 EDX: 00000001
> [ 15.915477][ C0] ESI: e4c7520c EDI: e4c75200 EBP: c1819d98 ESP: c1819d60
> [ 15.916755][ C0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210006
> [ 15.918067][ C0] CR0: 80050033 CR2: 00000005 CR3: 2ca6a000 CR4: 000406f0
> [ 15.919278][ C0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 15.920468][ C0] DR6: fffe0ff0 DR7: 00000400
> [ 15.921446][ C0] Call Trace:
> [ 15.922298][ C0] <SOFTIRQ>
> [ 15.923149][ C0] ? show_regs+0x55/0x80
> [ 15.924069][ C0] ? __die+0x1d/0x80
> [ 15.924934][ C0] ? page_fault_oops+0x65/0xc0
> [ 15.925890][ C0] ? kernelmode_fixup_or_oops+0x73/0x100
> [ 15.926986][ C0] ? __bad_area_nosemaphore+0xdc/0x1c0
> [ 15.928086][ C0] ? bad_area_nosemaphore+0xf/0x40
> [ 15.929061][ C0] ? do_user_addr_fault+0x1ac/0x3c0
> [ 15.930036][ C0] ? exc_page_fault+0x51/0x140
> [ 15.930957][ C0] ? pvclock_clocksource_read_nowd+0x140/0x140
> [ 15.931997][ C0] ? handle_exception+0x133/0x133
> [ 15.932938][ C0] ? pmd_clear_huge+0x7b/0x80
> [ 15.934885][ C0] ? pvclock_clocksource_read_nowd+0x140/0x140
> [ 15.935963][ C0] ? free_pcppages_bulk+0x7d/0x200
> [ 15.936915][ C0] ? pvclock_clocksource_read_nowd+0x140/0x140
> [ 15.937954][ C0] ? free_pcppages_bulk+0x7d/0x200
> [ 15.938876][ C0] free_unref_page_commit+0x120/0x180
> [ 15.939826][ C0] free_unref_page+0xe7/0x100
> [ 15.940688][ C0] __free_pages+0x87/0xc0
> [ 15.941519][ C0] __free_slab+0xa1/0x100
> [ 15.942383][ C0] free_slab+0x27/0xc0
> [ 15.943187][ C0] discard_slab+0x38/0x40
> [ 15.944014][ C0] __unfreeze_partials+0x20c/0x240
> [ 15.946439][ C0] put_cpu_partial+0x5b/0x80
> [ 15.947347][ C0] __slab_free+0x287/0x380
> [ 15.948207][ C0] ? __mod_memcg_lruvec_state+0x3e/0x80
> [ 15.949138][ C0] kmem_cache_free+0x329/0x340
> [ 15.950003][ C0] ? mt_free_rcu+0x10/0x40
> [ 15.950805][ C0] ? free_task+0x4d/0x80
> [ 15.951594][ C0] ? mt_free_rcu+0x10/0x40
> [ 15.952390][ C0] mt_free_rcu+0x10/0x40
> [ 15.953181][ C0] rcu_do_batch+0x158/0x440
> [ 15.953998][ C0] rcu_core+0xce/0x1c0
> [ 15.954751][ C0] rcu_core_si+0xd/0x40
> [ 15.955512][ C0] __do_softirq+0xad/0x233
> [ 15.956293][ C0] ? __lock_text_end+0x3/0x3
> [ 15.957084][ C0] call_on_stack+0x45/0x80
> [ 15.957871][ C0] </SOFTIRQ>
> [ 15.958525][ C0] ? irq_exit_rcu+0x6a/0xc0
> [ 15.959284][ C0] ? sysvec_apic_timer_interrupt+0x27/0x40
> [ 15.960136][ C0] ? handle_exception+0x133/0x133
> [ 15.960900][ C0] ? alarm_handle_timer+0xfb/0x100
> [ 15.961669][ C0] ? sysvec_call_function_single+0x40/0x40
> [ 15.962542][ C0] ? default_idle+0xb/0x40
> [ 15.963234][ C0] ? sysvec_call_function_single+0x40/0x40
> [ 15.964026][ C0] ? default_idle+0xb/0x40
> [ 15.964703][ C0] ? arch_cpu_idle+0x8/0x40
> [ 15.965379][ C0] ? default_idle_call+0x2a/0xc0
> [ 15.967867][ C0] ? cpuidle_idle_call+0x122/0x180
> [ 15.968680][ C0] ? do_idle+0x79/0xc0
> [ 15.969357][ C0] ? cpu_startup_entry+0x25/0x40
> [ 15.970106][ C0] ? rest_init+0x96/0xc0
> [ 15.970770][ C0] ? arch_call_rest_init+0xd/0x80
> [ 15.971505][ C0] ? start_kernel+0x347/0x480
> [ 15.972209][ C0] ? early_idt_handler_common+0x44/0x44
> [ 15.972969][ C0] ? i386_start_kernel+0x48/0x80
> [ 15.973678][ C0] ? startup_32_smp+0x156/0x158
> [ 15.974397][ C0] Modules linked in: intel_rapl_msr(E) intel_rapl_common(E) ata_generic(E) ppdev(E) crc32_pclmul(E) crc32c_intel(E) aesni_intel(E) ipmi_devintf(
> E) ipmi_msghandler(E) crypto_simd(E) ata_piix(E) cryptd(E) rapl(E) i2c_piix4(E) psmouse(E) evdev(E) serio_raw(E) bochs(E) drm_vram_helper(E) drm_kms_helper(E) drm_tt
> m_helper(E) ttm(E) libata(E) parport_pc(E) floppy(E) parport(E) qemu_fw_cfg(E) button(E) drm(E) configfs(E) fuse(E) autofs4(E)
> [ 15.978905][ C0] CR2: 0000000000000005
> [ 15.979621][ C0] ---[ end trace 0000000000000000 ]---
> [ 15.980419][ C0] EIP: free_pcppages_bulk+0x7d/0x200
> [ 15.981222][ C0] Code: 8d 34 c6 89 75 e4 83 f8 0c 0f 84 ee 00 00 00 ba ab aa aa aa f7 e2 b8 01 00 00 00 89 d1 d1 e9 d3 e0 89 45 e0 8b 45 e4 8b 50 04 <8b> 72 04
> 8d 5a fc 83 ee 04 39 c2 0f 84 0a 01 00 00 89 4d e8 eb 28
> [ 15.983663][ C0] EAX: e4c7520c EBX: e4c9f510 ECX: 55555555 EDX: 00000001
> [ 15.984705][ C0] ESI: e4c7520c EDI: e4c75200 EBP: c1819d98 ESP: c1819d60
> [ 15.985738][ C0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210006
> [ 15.986822][ C0] CR0: 80050033 CR2: 00000005 CR3: 2ca6a000 CR4: 000406f0
> [ 15.987832][ C0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 15.988839][ C0] DR6: fffe0ff0 DR7: 00000400
> [ 15.989679][ C0] Kernel panic - not syncing: Fatal exception in interrupt
> [ 15.996118][ C0] Kernel Offset: disabled
>
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20230824/202308241221.cc5ac84a-oliver.sang@xxxxxxxxx
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>
>

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Previous message: Catalin Marinas: "Re: [PATCH RFC 00/37] Add support for arm64 MTE dynamic tag storage reuse"
In reply to: kernel test robot: "Re: [PATCH RFC 2/2] mm/page_alloc: free_pcppages_bulk clean up"
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