On 2019/06/06 19:24, Max Kellermann <m...@blarg.de> wrote: > I have the same problem (kernel 5.1.7), but over here, it's a PHP > process, not khugepaged, which is looping inside compaction_alloc.
This is what happened an hour later: kernel tried to execute NX-protected page - exploit attempt? (uid: 33333) BUG: unable to handle kernel paging request at ffffffffc036f00f #PF error: [PROT] [INSTR] PGD 35fa10067 P4D 35fa10067 PUD 35fa12067 PMD 105ba71067 PTE 800000022d28e061 Oops: 0011 [#1] SMP PTI CPU: 12 PID: 263514 Comm: php-cgi7.0 Not tainted 5.1.7-cmag1-th+ #5 Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018 RIP: 0010:0xffffffffc036f00f Code: Bad RIP value. RSP: 0018:ffffb63c4d547928 EFLAGS: 00010216 RAX: 0000000000000000 RBX: ffffb63c4d547b10 RCX: 0000ffc004d021bd RDX: ffff9ac83fffc500 RSI: 7fe0026810dee7ff RDI: 7fe0026810dee400 RBP: 7fe0026810dee400 R08: 0000000000000002 R09: 0000000000020300 R10: 00010642641a0d3a R11: 0000000000000001 R12: 7fe0026810dee800 R13: 0000000000000001 R14: 0000000000000000 R15: ffff9ac83fffc500 FS: 00007fa5c1000740(0000) GS:ffff9ad01f600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffc036efe5 CR3: 00000008eb8a0005 CR4: 00000000001606e0 Call Trace: ? move_freelist_tail+0xd0/0xd0 ? migrate_pages+0xaa/0x780 ? isolate_freepages_block+0x380/0x380 ? compact_zone+0x6ec/0xca0 ? compact_zone_order+0xd8/0x120 ? try_to_compact_pages+0xb1/0x260 ? __alloc_pages_direct_compact+0x87/0x160 ? __alloc_pages_slowpath+0x427/0xd50 ? __alloc_pages_nodemask+0x2d6/0x310 ? do_huge_pmd_anonymous_page+0x131/0x680 ? vma_merge+0x24f/0x3a0 ? __handle_mm_fault+0xbca/0x1260 ? handle_mm_fault+0x135/0x1b0 ? __do_page_fault+0x242/0x4b0 ? page_fault+0x8/0x30 ? page_fault+0x1e/0x30 Modules linked in: CR2: ffffffffc036f00f ---[ end trace 0f31edf3041f5d9e ]--- RIP: 0010:0xffffffffc036f00f Code: Bad RIP value. RSP: 0018:ffffb63c4d547928 EFLAGS: 00010216 RAX: 0000000000000000 RBX: ffffb63c4d547b10 RCX: 0000ffc004d021bd RDX: ffff9ac83fffc500 RSI: 7fe0026810dee7ff RDI: 7fe0026810dee400 RBP: 7fe0026810dee400 R08: 0000000000000002 R09: 0000000000020300 R10: 00010642641a0d3a R11: 0000000000000001 R12: 7fe0026810dee800 R13: 0000000000000001 R14: 0000000000000000 R15: ffff9ac83fffc500 FS: 00007fa5c1000740(0000) GS:ffff9ad01f600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffc036efe5 CR3: 00000008eb8a0005 CR4: 00000000001606e0
