On 7/28/19 10:17 PM, Li Wang wrote: > Hi Naoya and Linux-MMers, > > The LTP/move_page12 V2 triggers SIGBUS in the kernel-v5.2.3 testing. > https://github.com/wangli5665/ltp/blob/master/testcases/kernel/syscalls/move_pages/move_pages12.c > > It seems like the retry mmap() triggers SIGBUS while doing thenuma_move_pages() in background. That is very similar to the kernelbug which was mentioned by commit 6bc9b56433b76e40d(mm: fix race onsoft-offlining ): A race condition between soft offline andhugetlb_fault which causes unexpected process SIGBUS killing. > > I'm not sure if that below patch is making sene to memory-failures.c, but after building a new kernel-5.2.3 with this change, the problem can NOT be reproduced. > > Any comments? Something seems strange. I can not reproduce with unmodified 5.2.3 [root@f23d move_pages]# uname -r 5.2.3 [root@f23d move_pages]# PATH=$PATH:$PWD ./move_pages12 tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s move_pages12.c:201: INFO: Free RAM 6725424 kB move_pages12.c:219: INFO: Increasing 2048kB hugepages pool on node 0 to 4 move_pages12.c:229: INFO: Increasing 2048kB hugepages pool on node 1 to 4 move_pages12.c:145: INFO: Allocating and freeing 4 hugepages on node 0 move_pages12.c:145: INFO: Allocating and freeing 4 hugepages on node 1 move_pages12.c:135: PASS: Bug not reproduced Summary: passed 1 failed 0 skipped 0 warnings 0 Also, the soft_offline_huge_page() code should not come into play with this specific test. -- Mike Kravetz
