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Howlett" To: Jiri Olsa Cc: Bert Karwatzki , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , linux-next@vger.kernel.org Subject: Re: commit 1c29a32ce65f4cd0f1c causes Bad rss-counter state and firefox-esr crash in linux-next-20240613 Message-ID: Mail-Followup-To: "Liam R. 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 ML+Rrf/F G0Q1gl6oS4zdThsZ5uwYVLe2JEKrYBlice+iGRpa/SswX11ANrRq57dzp8BwlXdDATKbjI4xxC0TsIhzlRA1cYhyXUo3lgQSVMGzfeXrWIn054V7u0iUPvWHewvL2lyLK6WOnt+PHk0RrC7x3WDwOVWuP+MUdwA3msWV9jxR6AiSRI8j3dj7wUUGBq0/2IpYCyTeu3FhRUhkvUo6G4VwKA99nJFTS9S3dljWWLi4druipRUdrQuzPxg56+AN7hKsYHAFauSmGahCEtI4eXzeZwr1eY5p5fGonBonqLQ1c2PxPf0mnipG0bpMHR0FsszUl+Of8CN32/M1O7VBRnAQO+ehPHnx5+PqaE+K9PNsBVx/5wLlcsvcLx4tRz/L03ZVamZUrbaGpc8qWin4csWPo7x03RklQvRsD/lh6A6ASJjQAq2Y= 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: List-Subscribe: List-Unsubscribe: * Jiri Olsa [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