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@xxxxxxxxxx How reproducible is this? -- Cheers, David / dhildenb
