linux-kernel - Re: commit 1c29a32ce65f4cd0f1c causes Bad rss-counter state and firefox-esr crash in linux-next-20240613

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Date: Fri, 14 Jun 2024 08:31:08 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Jiri Olsa <olsajiri@...il.com>
Cc: Bert Karwatzki <spasswolf@....de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, linux-next@...r.kernel.org
Subject: Re: commit 1c29a32ce65f4cd0f1c causes Bad rss-counter state and
 firefox-esr crash in linux-next-20240613

* Jiri Olsa <olsajiri@...il.com> [240614 03:54]:
> On Fri, Jun 14, 2024 at 01:40:54AM +0200, Bert Karwatzki wrote:
> > Since linux-next-20240613 firefox-esr crashes after several minutes of browsing
> > giving the following error messages in dmesg:
> > [ T2343] BUG: Bad rss-counter state mm:00000000babe0c39 type:MM_ANONPAGES val:86
> > [ T4063] show_signal_msg: 16 callbacks suppressed
> > [ T4063] Isolated Web Co[4063]: segfault at 396d1686c000 ip 0000396d1686c000 sp
> > 00007ffd767b30a8 error 14 likely on CPU 7 (core 3, socket 0)
> > [ T4063] Code: Unable to access opcode bytes at 0x396d1686bfd6.
> > [ T4211] BUG: Bad rss-counter state mm:00000000cd9fc541 type:MM_ANONPAGES
> > val:817
> > [ T3798] BUG: Bad rss-counter state mm:00000000432d87c2 type:MM_ANONPAGES
> > val:181
> > [ T5548] BUG: Bad rss-counter state mm:00000000034aa27a type:MM_ANONPAGES
> > val:242
> > [ T3823] BUG: Bad rss-counter state mm:0000000099734197 type:MM_ANONPAGES
> > val:137
> > [    T1] BUG: Bad rss-counter state mm:000000005e5e2f2f type:MM_ANONPAGES val:28
> > 
> > (these are the error messages of several crashes and the error seems to affect
> > other processes, too (T1))
> > 
> > The crash can be provoked to appear in ~1min by opening large numbers of tabs in
> > firefox-esr (by holding pressing ctrl+t for some time). With this I bisected the
> > error to commit "1c29a32ce65f mm/mmap: use split munmap calls for MAP_FIXED" and
> > reverting this commit in linux-next-20240613 fixes the issue for me.
> 
> +1, bpf selftests are failing for me because mmap fails with:
>   mmap(0x7f9361bc9000, 4096, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 4, 0) = -1 EBUSY (Device or resource busy)
> 
> did not get to the cause, but reverting the 1c29a32ce65f fixes it for me
> 

Thanks for the information, this sounds like a much easier way to
recreate the issue.

Regards,
Liam