linux-kernel - Re: WARN_ON in move_normal

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Message-ID: <ZB21+05jScCIK/rz@dhcp22.suse.cz>
Date:   Fri, 24 Mar 2023 15:38:51 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: WARN_ON in move_normal_pmd

On Fri 24-03-23 09:43:10, Joel Fernandes wrote:
[...]
> Michal, would you also mind providing the full stack you are seeing
> just so we know it is the same issue (i.e. triggered via exec)?

Yes, it is the exec path
[  544.236782][T20518] Call Trace:
[  544.237467][T20518]  <TASK>
[  544.238034][T20518]  move_page_tables+0x8e4/0x930
[  544.238039][T20518]  shift_arg_pages+0xb5/0x180
[  544.238044][T20518]  ? mprotect_fixup+0x1ce/0x2e0
[  544.238046][T20518]  setup_arg_pages+0x256/0x2b0
[  544.238049][T20518]  load_elf_binary+0x375/0x15d0
[  544.238052][T20518]  ? __kernel_read+0x2e8/0x310
[  544.238056][T20518]  ? __kernel_read+0x2e8/0x310
[  544.238059][T20518]  bprm_execve+0x2ec/0x650
[  544.238062][T20518]  do_execveat_common.isra.42+0x1ed/0x230
[  544.238064][T20518]  __x64_sys_execve+0x32/0x40
[  544.238067][T20518]  do_syscall_64+0x5b/0x80
[  544.238072][T20518]  ? __SCT__preempt_schedule_notrace+0x8/0x8
[  544.238075][T20518]  ? __SCT__preempt_schedule_notrace+0x8/0x8
[  544.238076][T20518]  ? exit_to_user_mode_prepare+0xfc/0x230
[  544.250270][T20518]  ? syscall_exit_to_user_mode+0x18/0x40
[  544.250292][T20518]  ? do_syscall_64+0x67/0x80
[  544.250294][T20518]  ? exc_page_fault+0x67/0x150
[  544.250297][T20518]  entry_SYSCALL_64_after_hwframe+0x61/0xcb
-- 
Michal Hocko
SUSE Labs