linux-kernel - Re: linux-next: boot warning after merge of the mm tree

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Message-ID: <20240828093602.1c08632f@canb.auug.org.au>
Date: Wed, 28 Aug 2024 09:36:02 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Zhiguo Jiang <justinjiang@...o.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: boot warning after merge of the mm tree

Hi all,

On Mon, 26 Aug 2024 19:46:48 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> After merging the mm tree, today's linux-next boot test (powerpc
> pseries_le_defconfig) produced many warnings like this:
> 
> Run /init as init process
> mount (55) used greatest stack depth: 28240 bytes left
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at mm/rmap.c:443 unlink_anon_vmas+0x23c/0x358
> Modules linked in:
> CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.11.0-rc5-06732-g133a683d26fd #14
> Hardware name: IBM pSeries (emulated by qemu) POWER8 (architected) 0x4d0200 0xf000004 of:SLOF,HEAD pSeries
> NIP:  c0000000004d0208 LR: c0000000004d0158 CTR: c00000000121d230
> REGS: c0000000049bf550 TRAP: 0700   Not tainted  (6.11.0-rc5-06732-g133a683d26fd)
> MSR:  800000000282b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 44004222  XER: 20000000
> CFAR: c0000000004d019c IRQMASK: 0 
> GPR00: c0000000004d0158 c0000000049bf7f0 c00000000167b100 c000000008b5e2b0 
> GPR04: c000000008b5e300 0000000000000006 c00000000445a108 0000000000000000 
> GPR08: 0000000000000000 0000000000000001 ffffffffffffffff c0000000013550d8 
> GPR12: 0000000000000000 c000000002b90000 0000000000000000 0000000000000000 
> GPR16: 0000000000000000 c000000006cea000 c00000000405e3c0 c000000006556500 
> GPR20: c000000006ce5000 c000000002a30308 0000000000000000 c000000008ba8398 
> GPR24: c000000008ba8388 c000000008b60310 c000000002acb790 5deadbeef0000100 
> GPR28: c000000008ba8398 5deadbeef0000122 c000000008ba8388 c000000008b60300 
> NIP [c0000000004d0208] unlink_anon_vmas+0x23c/0x358
> LR [c0000000004d0158] unlink_anon_vmas+0x18c/0x358
> Call Trace:
> [c0000000049bf7f0] [c0000000004d00f0] unlink_anon_vmas+0x124/0x358 (unreliable)
> [c0000000049bf860] [c0000000004a7eec] free_pgtables+0x1d0/0x368
> [c0000000049bf930] [c0000000004bce20] exit_mmap+0x1c0/0x578
> [c0000000049bfa70] [c000000000151f80] __mmput+0x60/0x1e0
> [c0000000049bfaa0] [c0000000005a6980] begin_new_exec+0x6e0/0xed0
> [c0000000049bfb20] [c0000000006405a8] load_elf_binary+0x460/0x1b68
> [c0000000049bfc70] [c0000000005a4088] bprm_execve+0x2ac/0x754
> [c0000000049bfd40] [c0000000005a5de0] do_execveat_common+0x188/0x250
> [c0000000049bfde0] [c0000000005a71c4] sys_execve+0x54/0x6c
> [c0000000049bfe10] [c000000000030980] system_call_exception+0x120/0x310
> [c0000000049bfe50] [c00000000000d6a0] system_call_common+0x160/0x2c4
> --- interrupt: c00 at 0x7fff98ea1638
> NIP:  00007fff98ea1638 LR: 000000001004a12c CTR: 0000000000000000
> REGS: c0000000049bfe80 TRAP: 0c00   Not tainted  (6.11.0-rc5-06732-g133a683d26fd)
> MSR:  800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE>  CR: 22002824  XER: 00000000
> IRQMASK: 0 
> GPR00: 000000000000000b 00007fffcec19410 00007fff98f79900 000001001dc20410 
> GPR04: 000001001dc20440 000001001dc20450 0000000000000000 0000000000000000 
> GPR08: 000001001dc20410 0000000000000000 0000000000000000 0000000000000000 
> GPR12: 0000000000000000 00007fff98ffa9a0 0000000000000000 0000000000000000 
> GPR16: 0000000000000000 0000000000000000 0000000000000000 00000000100b8fd0 
> GPR20: 00000000100d03a2 00000000100b8f90 0000000000000000 0000000000000000 
> GPR24: 0000000000000000 00000000100e77b8 00000000100b8700 00000000100d03e6 
> GPR28: 000001001dc20450 00000000100d03e6 000001001dc20410 000001001dc20440 
> NIP [00007fff98ea1638] 0x7fff98ea1638
> LR [000000001004a12c] 0x1004a12c
> --- interrupt: c00
> Code: fbbf0018 7fdff378 48033221 60000000 ebd90000 7c39e040 3bdefff0 418200a8 e87f0008 e9430038 312affff 7d295110 <0b090000> e9430040 312affff 7d295110 
> ---[ end trace 0000000000000000 ]---
> mkdir (59) used greatest stack depth: 28176 bytes left
> 
> Bisected to commit
> 
>   1cd7eb306a54 ("vma remove the unneeded avc bound with non-CoWed folio")
> 
> I have reverted that commit for today.

I am still reverting that commit.

-- 
Cheers,
Stephen Rothwell

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