From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: syzbot <syzbot+826543256ed3b8c37f62@syzkaller.appspotmail.com>,
Alex Shi <alex.shi@linux.alibaba.com>
Cc: akpm@linux-foundation.org, cgroups@vger.kernel.org,
hannes@cmpxchg.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mhocko@kernel.org,
syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com
Subject: Re: linux-next test error: BUG: using __this_cpu_read() in preemptible code in __mod_memcg_state
Date: Mon, 9 Mar 2020 12:24:23 +0300 [thread overview]
Message-ID: <20200309092423.2ww3aw6yfyce7yty@box> (raw)
In-Reply-To: <00000000000022640205a04a20d8@google.com>
On Sat, Mar 07, 2020 at 01:05:10PM -0800, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: b86a6a24 Add linux-next specific files for 20200306
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1766b731e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=9c79dccc623ccc6f
> dashboard link: https://syzkaller.appspot.com/bug?extid=826543256ed3b8c37f62
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+826543256ed3b8c37f62@syzkaller.appspotmail.com
>
> check_preemption_disabled: 3 callbacks suppressed
> BUG: using __this_cpu_read() in preemptible [00000000] code: syz-fuzzer/9432
> caller is __mod_memcg_state+0x27/0x1a0 mm/memcontrol.c:689
> CPU: 1 PID: 9432 Comm: syz-fuzzer Not tainted 5.6.0-rc4-next-20200306-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x188/0x20d lib/dump_stack.c:118
> check_preemption_disabled lib/smp_processor_id.c:47 [inline]
> __this_cpu_preempt_check.cold+0x84/0x90 lib/smp_processor_id.c:64
> __mod_memcg_state+0x27/0x1a0 mm/memcontrol.c:689
> __split_huge_page mm/huge_memory.c:2575 [inline]
> split_huge_page_to_list+0x124b/0x3380 mm/huge_memory.c:2862
> split_huge_page include/linux/huge_mm.h:167 [inline]
It looks like a regression due to c8cba0cc2a80 ("mm/thp: narrow lru
locking").
Alex?
> madvise_free_huge_pmd+0x873/0xb90 mm/huge_memory.c:1766
> madvise_free_pte_range+0x6ff/0x2650 mm/madvise.c:584
> walk_pmd_range mm/pagewalk.c:89 [inline]
> walk_pud_range mm/pagewalk.c:160 [inline]
> walk_p4d_range mm/pagewalk.c:193 [inline]
> walk_pgd_range mm/pagewalk.c:229 [inline]
> __walk_page_range+0xcfb/0x2070 mm/pagewalk.c:331
> walk_page_range+0x1bd/0x3a0 mm/pagewalk.c:427
> madvise_free_single_vma+0x384/0x550 mm/madvise.c:731
> madvise_dontneed_free mm/madvise.c:819 [inline]
> madvise_vma mm/madvise.c:958 [inline]
> do_madvise mm/madvise.c:1161 [inline]
> do_madvise+0x5ba/0x1b80 mm/madvise.c:1084
> __do_sys_madvise mm/madvise.c:1189 [inline]
> __se_sys_madvise mm/madvise.c:1187 [inline]
> __x64_sys_madvise+0xae/0x120 mm/madvise.c:1187
> do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x460bf7
--
Kirill A. Shutemov
next prev parent reply other threads:[~2020-03-09 9:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-07 21:05 linux-next test error: BUG: using __this_cpu_read() in preemptible code in __mod_memcg_state syzbot
2020-03-09 9:24 ` Kirill A. Shutemov [this message]
2020-03-09 9:56 ` Alex Shi
2020-03-09 13:26 ` Alex Shi
2020-04-18 7:04 ` Dmitry Vyukov
2020-04-18 7:43 ` Stephen Rothwell
2020-04-18 7:50 ` Stephen Rothwell
2020-04-18 8:02 ` Dmitry Vyukov
2020-04-18 8:13 ` Stephen Rothwell
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