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[2003:cb:c748:ba00:1c00:48ea:7b5a:c12b]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-35f1bcbc31bsm8021967f8f.44.2024.06.11.05.09.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Jun 2024 05:09:44 -0700 (PDT) Message-ID: <3ce90ee2-f51b-49fc-b010-f97e61e617f4@redhat.com> Date: Tue, 11 Jun 2024 14:09:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: LTP: fork13: kernel panic on rk3399-rock-pi-4 running mainline 6.10.rc3 To: Baolin Wang , Naresh Kamboju , open list , linux-mm , lkft-triage@lists.linaro.org, Linux Regressions Cc: Andrew Morton , willy@infradead.org, Kefeng Wang , Barry Song , Ryan Roberts , "Russell King (Oracle)" , Dan Carpenter , Arnd Bergmann , Anders Roxell References: <80a05784-21dd-4f20-b441-1e2a2be0e0ff@linux.alibaba.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ 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wrote: >> On 11.06.24 12:14, Naresh Kamboju wrote: >>> The kernel panic was noticed while running LTP syscalls fork13 (long >>> running) on >>> the mainline master 6.10.rc3 kernel on arm64 rk3399-rock-pi-4 device. >>> >>> Please find detailed logs in the links, >>> >>> As you know fork13 is a stress test case trying to generate a maximum >>> number >>> of PID's in a 100,000 loop. >>> >>> This device is running via NFS mounted filesystem. >>> >>> I have tried to reproduce this problem in a loop but failed to >>> reproduce the >>> crash. >>> >>> >>> Crash flow: >>> ------ >>> fork13 run started >>> BUG: Bad page map in process fork13 >>> BUG: Bad rss-counter state mm: >>> Unable to handle kernel paging request at virtual address >>> Internal error: Oops: 0000000096000046 >>> run for 800 secs ( 13 minutes) and more. >>> fork14 run started and completed >>> >>> fpathconf01 run started and completed >>> sugov: >>> >>> Unable to handle kernel NULL pointer dereference at virtual address >>> >>> Insufficient stack space to handle exception! >>> end Kernel panic - not syncing: kernel stack overflow >>> >>> I have tried to decode stack dump by not being useful [1]. >>> [1] https://people.linaro.org/~naresh.kamboju/output-rk3399.txt >>> >>> Test log : >>> -------- >>> tst_test.c:1733: TINFO: LTP version: 20240524 >>> tst_test.c:1617: TINFO: Timeout per run is 0h 15m 00s >>> [  904.280569] BUG: Bad page map in process fork13  pte:2000000019ffc3 >>> pmd:80000000df55003 >>> [  904.281397] page: refcount:1 mapcount:-1 mapping:0000000000000000 >>> index:0x0 pfn:0x19f >> >> Mapcount underflow on a small folio (head: not printed). >> >> [...] >> >>> [  904.294564] BUG: Bad page map in process fork13  pte:200000002e4fc3 >>> pmd:80000000df55003 >>> [  904.295275] page: refcount:2 mapcount:-1 mapping:000000007885152f >>> index:0x6 pfn:0x2e4 >> >> Another mapcount underflow on a small folio (head: not printed). >> >> >>> [  904.309309] BUG: Bad page map in process fork13  pte:20000000cc6fc3 >>> pmd:80000000df55003 >>> [  904.310031] page: refcount:1 mapcount:-1 mapping:0000000000000000 >>> index:0x6 pfn:0xcc6 >>> [  904.310728] head: order:3 mapcount:-1 entire_mapcount:0 >>> nr_pages_mapped:8388607 pincount:0 >> >> Mapcount underflow on a large folio. >> >> ... >> >>> [  904.326666] BUG: Bad page map in process fork13  pte:20000000268fc3 >>> pmd:80000000df55003 >>> [  904.327390] page: refcount:1 mapcount:-1 mapping:00000000f0624181 >>> index:0x1b pfn:0x268 >> >> Another mapcount underflow on a small folio (head: not printed). >> >>> [  904.328094] memcg:ffff0000016b4000 >>> [  904.328401] aops:nfs_file_aops ino:8526e6 dentry >>> name:"libgpg-error.so.0.36.0" >>> [  904.329051] flags: >>> 0x3fffe000000002c(referenced|uptodate|lru|node=0|zone=0|lastcpupid=0x1ffff) >>> [  904.329878] raw: 03fffe000000002c fffffdffc0009a48 fffffdffc022f3c8 >>> ffff00000688bd60 >>> [  904.330561] raw: 000000000000001b 0000000000000000 00000001fffffffe >>> ffff0000016b4000 >>> [  904.331240] page dumped because: bad pte >>> [  904.331590] addr:0000aaaad9afe000 vm_flags:00000075 >>> anon_vma:0000000000000000 mapping:ffff0000300d4188 index:2e >>> [  904.332476] file:fork13 fault:filemap_fault mmap:nfs_file_mmap >>> read_folio:nfs_read_folio >>> [  904.333245] CPU: 5 PID: 22685 Comm: fork13 Tainted: G    B >> >> >> Are these maybe side-effects due to >> >> https://lkml.kernel.org/r/20240607103241.1298388-1-wangkefeng.wang@huawei.com > > IIUC, the rk3399-rock-pi-4b device has no NUMA nodes (6 arm64 cores), so > I don't think the numa balancing will cause this issue. > > Anyway, I will run fork13 test case on my arm64 server to try. I have the faint recollection that we can (or at least could in the past) end up in do_numa_page() also without NUMA hinting. I documented in 51d3d5eb74ff53b92dcff48b30ae2ed8edd85a32: " Note that do_numa_page() / do_huge_pmd_numa_page() can be reached even without NUMA hinting (which currently doesn't seem to be applicable to shmem), for example, by using uffd-wp with a PROT_WRITE shmem VMA. " But I don't remember all of the details, though. -- Cheers, David / dhildenb