* Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> [240613 20:03]: > On Fri, 14 Jun 2024 01:40:54 +0200 Bert Karwatzki <spasswolf@xxxxxx> 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 > > Let's hope Linus doesn't read this. Why are we nuking the entire > planet just because some counter went wonky? I think I know what's going on, and it's more than just the counters being off here. The counters are the symptom of what is happening. > > > (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. > > Thanks, that must have taken a lot of time. Yes, thank you for all that work and apologies in creating this frustrating situation. Andrew, please drop the set from your branch. I need to write some more tests, but I suspect I will need to do some work around the vma_merge() function, which is never a fun endeavor. Regards, Liam
