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bh=yHILrvi6nZy2kVD6aE2AeGm4dwv77W6buiiH3ea0usM=; h=Date:From:Subject:To:Cc:References:In-Reply-To:From; b=syGQjp8mTIOUFpeRpVwiwWtY/PFcoclR64RPf0nfhr0hlS8rMrjauG3PLhdM8NPgt 8vwLawldVbRxez34lJlA0KgFVFDm0CL2GhbWcs5spYe2hesRlb01H0N2p3QfiB+ZOn b7tpN9rtEW4bFR/gj/RO+ZwMZAxwraDueWQlvPef7xG8dPFOZxV7GkMkRh4K936Kzi ADAHEz+aGj0ufUpZ7tulyvOg8lLOxb7qoWT4yJZ5uinZiVhlOQb/9ohCGZiyJcINlK EVxhSpX/TGMZTU7UGLXO36sHV8zo34Ahu4LbZMCwtd7+BzEHFKcqHCM3ZpnXZhJ85e C0iyKSG/dnLqw== Message-ID: <4c467851-8080-44d3-d017-b0e283896119@alu.unizg.hr> Date: Thu, 12 Jan 2023 20:39:48 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0 From: Mirsad Todorovac Subject: Re: [BISECTED] BUG: Regression: A Problem with /sys/kernel/debug/kmemleak output: backtrace not printed since 6.2.0-rc1 To: linux-kernel@vger.kernel.org Cc: Catalin Marinas , Andrew Morton , linux-mm@kvack.org, Zhaoyang Huang References: <5272a819-ef74-65ff-be61-4d2d567337de@alu.unizg.hr> Content-Language: en-US, hr In-Reply-To: <5272a819-ef74-65ff-be61-4d2d567337de@alu.unizg.hr> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 2AA74100007 X-Rspamd-Server: rspam01 X-Stat-Signature: fgsnp88fjpqyk7jwbs9tueorwzo1ua3y X-HE-Tag: 1673552401-650901 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 1/4/23 17:08, Mirsad Goran Todorovac wrote: > I hate to bring bad news again, but there seems to be a problem with the output of /sys/kernel/debug/kmemleak: > > [root@pc-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@pc-mtodorov ~]# > > Apparently, backtrace of called functions on the stack is no longer printed with the list of memory leaks. > > This appeared on Lenovo desktop 10TX000VCR, with AlmaLinux 8.7 and BIOS version M22KT49A (11/10/2022) > and 6.2-rc1 and 6.2-rc2 builds. > > This worked on 6.1 with the same CONFIG_KMEMLEAK=y and MGLRU enabled on a vanilla mainstream kernel > from Mr. Torvalds' tree. I don't know if this is deliberate feature for some reason or a bug. > > Please find attached the config, lshw and kmemleak output. Hi all, The bisection gave this commit as the culprit for the severed stack backtrace print in /sys/kernel/debug/kmemleak: mtodorov@domac:~/linux/kernel/linux_torvalds$ git bisect good 56a61617dd2276cbc56a6c868599716386d70041 is the first bad commit commit 56a61617dd2276cbc56a6c868599716386d70041 Author: Zhaoyang Huang Date: Thu Oct 27 17:50:24 2022 +0800 mm: use stack_depot for recording kmemleak's backtrace Using stack_depot to record kmemleak's backtrace which has been implemented on slub for reducing redundant information. The complete bisect log is: mtodorov@domac:~/linux/kernel/linux_torvalds$ git bisect log git bisect start '--' 'mm' # good: [830b3c68c1fb1e9176028d02ef86f3cf76aa2476] Linux 6.1 git bisect good 830b3c68c1fb1e9176028d02ef86f3cf76aa2476 # bad: [1b929c02afd37871d5afb9d498426f83432e71c2] Linux 6.2-rc1 git bisect bad 1b929c02afd37871d5afb9d498426f83432e71c2 # good: [8b9ed79c2d587bec5f603d66801478a5af9af842] Merge tag 'x86_asm_for_v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 8b9ed79c2d587bec5f603d66801478a5af9af842 # good: [e83b39d6bbdb6d25bd6f5c258832774635d29b47] mm: make drop_caches keep reclaiming on all nodes git bisect good e83b39d6bbdb6d25bd6f5c258832774635d29b47 # good: [9997bc017549acd6425e32300eff28424ffeeb6b] zsmalloc: implement writeback mechanism for zsmalloc git bisect good 9997bc017549acd6425e32300eff28424ffeeb6b # good: [6287b7dae80944bfa37784a8f9d6861a4facaa6e] mm,thp,rmap: fix races between updates of subpages_mapcount git bisect good 6287b7dae80944bfa37784a8f9d6861a4facaa6e # good: [8fa590bf344816c925810331eea8387627bbeb40] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm git bisect good 8fa590bf344816c925810331eea8387627bbeb40 # good: [4f292c4de4f6fb83776c0ff22674121eb6ddfa2f] Merge tag 'x86_mm_for_6.2_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 4f292c4de4f6fb83776c0ff22674121eb6ddfa2f # bad: [1ea9d333ba475041efe43d9d9bc32e64aea2ea2b] Merge tag 'mm-stable-2022-12-17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm git bisect bad 1ea9d333ba475041efe43d9d9bc32e64aea2ea2b # bad: [56a61617dd2276cbc56a6c868599716386d70041] mm: use stack_depot for recording kmemleak's backtrace git bisect bad 56a61617dd2276cbc56a6c868599716386d70041 # good: [61b963b52f59524e27692bc1c14bfb2459e32eb3] mm/gup_test: free memory allocated via kvcalloc() using kvfree() git bisect good 61b963b52f59524e27692bc1c14bfb2459e32eb3 # first bad commit: [56a61617dd2276cbc56a6c868599716386d70041] mm: use stack_depot for recording kmemleak's backtrace # good: [9102b78b6f6ae6af3557114c265c266b312c1319] maple_tree: update copyright dates for test code git bisect good 9102b78b6f6ae6af3557114c265c266b312c1319 # first bad commit: [56a61617dd2276cbc56a6c868599716386d70041] mm: use stack_depot for recording kmemleak's backtrace You have mail in /var/mail/mtodorov mtodorov@domac:~/linux/kernel/linux_torvalds$ The platform is 10TX000VCR (LENOVO_MT_10TX_BU_Lenovo_FM_V530S-07ICB) running AlmaLinux 8.7 (CentOS clone) and BIOS M22KT49A. GCC used was: mtodorov@domac:~/linux/kernel/linux_torvalds$ gcc --version gcc (Debian 8.3.0-6) 8.3.0 Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. mtodorov@domac:~/linux/kernel/linux_torvalds$ Hope this helps. I lack the insight to pinpoint the exact fault in the patch. Regards, Mirsad -- Mirsad Goran Todorovac Sistem inženjer Grafički fakultet | Akademija likovnih umjetnosti Sveučilište u Zagrebu System engineer Faculty of Graphic Arts | Academy of Fine Arts University of Zagreb, Republic of Croatia