linux-kernel - Re: INFO: [BISECTED] Regression: A Problem with /sys/kernel/debug/kmemleak output: backtrace not printed since 6.2.0-rc1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <633ee51b-7f81-c38a-7543-34df69480f1d@leemhuis.info>
Date:   Sun, 29 Jan 2023 16:06:00 +0100
From:   "Linux kernel regression tracking (#adding)" 
        <regressions@...mhuis.info>
To:     Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
        linux-kernel@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>
Subject: Re: INFO: [BISECTED] Regression: A Problem with
 /sys/kernel/debug/kmemleak output: backtrace not printed since 6.2.0-rc1

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 12.01.23 20:50, Mirsad Todorovac wrote:
> Hi all,
> 
> there seems to be a problem with the output of /sys/kernel/debug/kmemleak:
> 
> [root@...mtodorov ~]# cat /sys/kernel/debug/kmemleak
> unreferenced object 0xffff951c118568b0 (size 16):
>   comm "kworker/u12:2", pid 56, jiffies 4294893952 (age 4356.548s)
>   hex dump (first 16 bytes):
>     6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0.......
>   backtrace:
> [root@...mtodorov ~]#
> 
> Apparently, backtrace of called functions on the stack is no longer
> printed with the list of memory leaks.
> [...]

This is already close to being fixed, but I want to have it in this week
report, hence I'm adding it (better late than never):

#regzbot ^introduced 56a61617dd22
#regzbot title mm: stack_depot: Failure during Stack Depot allocating
hash table
#regzbot monitor: https://lore.kernel.org/all/Y8Fq5m0CLfcFLCOY@zn.tnic/
#regzbot fix: mm: use stack_depot_early_init for kmemleak
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.