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Date:   Wed, 8 Jun 2022 16:07:23 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     kernel test robot <oliver.sang@intel.com>
Cc:     Baolin Wang <baolin.wang@linux.alibaba.com>,
        0day robot <lkp@intel.com>,
        LKML <linux-kernel@vger.kernel.org>, linux-csky@vger.kernel.org,
        openrisc@lists.librecores.org, linux-arch@vger.kernel.org,
        lkp@lists.01.org, akpm@linux-foundation.org, linux-mm@kvack.org
Subject: Re: [mm]  9b12e49e9b: BUG:Bad_page_state_in_process
Message-ID: <YqC7K0e2FFp7vT6i@casper.infradead.org>
References: <d35f42f7b598f629437940f941826e2cc49a97f6.1654271618.git.baolin.wang@linux.alibaba.com>
 <20220608143819.GA31193@xsang-OptiPlex-9020>
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On Wed, Jun 08, 2022 at 10:38:19PM +0800, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-11):
> 
> commit: 9b12e49e9b02bbaca8041f236a6b2fd4586d45c8 ("[RFC PATCH 3/3] mm: Add kernel PTE level pagetable pages account")

> [   75.338681][ T4873] BUG: Bad page state in process 444  pfn:20b066
> [   75.338840][ T4873] page:0000000016cf0259 refcount:0 mapcount:-512 mapping:0000000000000000 index:0x0 pfn:0x20b066

mapcount:-512 is PG_table.  Somebody forgot to call
pgtable_pte_page_dtor() (or similar)

> [   75.339041][ T4873] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)
> [   75.339190][ T4873] raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000
> [   75.339350][ T4873] raw: 0000000000000000 0000000000000000 00000000fffffdff 0000000000000000
> [   75.339508][ T4873] page dumped because: nonzero mapcount
> [   75.341013][ T4873] Call Trace:
> [   75.341080][ T4873]  <TASK>
> [ 75.341142][ T4873] dump_stack_lvl (lib/dump_stack.c:107 (discriminator 1)) 
> [ 75.341236][ T4873] bad_page.cold (mm/page_alloc.c:637) 
> [ 75.341326][ T4873] free_pcppages_bulk (mm/page_alloc.c:1511) 
> [ 75.341428][ T4873] free_unref_page (arch/x86/include/asm/irqflags.h:137 mm/page_alloc.c:3444) 
> [ 75.341524][ T4873] __mmdrop (arch/x86/include/asm/mmu_context.h:125 (discriminator 3) kernel/fork.c:791 (discriminator 3)) 
> [ 75.341608][ T4873] ? __mmput (arch/x86/include/asm/atomic.h:123 include/linux/atomic/atomic-instrumented.h:576 include/linux/sched/mm.h:49 kernel/fork.c:1194) 
> [ 75.341889][ T4873] exec_mmap (fs/exec.c:1035) 
> [ 75.341977][ T4873] begin_new_exec (fs/exec.c:1293) 
> [ 75.342071][ T4873] ? kernel_read (fs/read_write.c:455) 
> [ 75.342160][ T4873] load_elf_binary (fs/binfmt_elf.c:1002)