On Fri, Feb 21, 2014 at 05:46:36PM -0500, Sasha Levin wrote: > Hi all, > > While fuzzing with trinity inside a KVM tools guest running latest -next > kernel I've stumbled on the following (now with pretty line numbers!) spew: > > [ 746.125099] kernel BUG at mm/huge_memory.c:1371! It "VM_BUG_ON_PAGE(!PageHead(page), page);", correct? I don't see dump_page() output. > [ 746.125775] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 746.126774] Dumping ftrace buffer: > [ 746.127484] (ftrace buffer empty) > [ 746.127781] Modules linked in: > [ 746.128358] CPU: 2 PID: 19816 Comm: trinity-c127 Tainted: G W > 3.14.0-rc3-next-20140221-sasha-00008-g0e660cf-dirty #114 > [ 746.130196] task: ffff8803a7cc3000 ti: ffff8803a7f1c000 task.ti: ffff8803a7f1c000 > [ 746.130317] RIP: 0010:[<mm/huge_memory.c:1371>] [<mm/huge_memory.c:1371>] zap_huge_pmd+0x17a/0x200 > [ 746.130317] RSP: 0018:ffff8803a7f1dca8 EFLAGS: 00010246 > [ 746.130317] RAX: ffff8801ab4ac000 RBX: ffff8803a7f1ddd8 RCX: 000000000000002e > [ 746.130317] RDX: 0000000000000000 RSI: ffff8803a7cc3d00 RDI: 000000000172c000 > [ 746.130317] RBP: ffff8803a7f1dce8 R08: 0000000000000000 R09: 0000000000000000 > [ 746.130317] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0006a8fa00 > [ 746.130317] R13: ffffea0005cb0000 R14: 00007f784f800000 R15: 00007f785750bfff > [ 746.130317] FS: 00007f785afbc700(0000) GS:ffff8801abc00000(0000) knlGS:0000000000000000 > [ 746.130317] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 746.130317] CR2: 0000000000000010 CR3: 00000003a9739000 CR4: 00000000000006e0 > [ 746.130317] DR0: 0000000000693000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 746.130317] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 > [ 746.130317] Stack: > [ 746.130317] 00000000000004de ffff8803a9777390 ffff8803a7f1dce8 ffff8803a2afd3e0 > [ 746.130317] 00007f784f800000 00007f785750c000 ffff8803a7f1ddd8 00007f785750bfff > [ 746.130317] ffff8803a7f1dd78 ffffffff81285536 00000000001d8500 00007f784fa00000 > [ 746.130317] Call Trace: > [ 746.130317] [<mm/memory.c:1231 mm/memory.c:1265 mm/memory.c:1290>] unmap_page_range+0x2c6/0x410 > [ 746.130317] [<mm/memory.c:1338>] unmap_single_vma+0xf1/0x110 > [ 746.130317] [<mm/memory.c:1390>] zap_page_range+0x121/0x170 > [ 746.130317] [<mm/madvise.c:271 mm/madvise.c:371>] madvise_vma+0x180/0x1c0 > [ 746.130317] [<mm/madvise.c:518 mm/madvise.c:448>] SyS_madvise+0x17e/0x250 > [ 746.130317] [<arch/x86/kernel/entry_64.S:749>] tracesys+0xdd/0xe2 > [ 746.152464] Code: 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 81 80 60 03 > 00 00 00 fe ff ff 49 8b 45 00 f6 c4 40 75 18 31 f6 4c 89 ef e8 26 29 f9 ff > <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 8b 03 f0 48 ff 48 > [ 746.152464] RIP [<mm/huge_memory.c:1371>] zap_huge_pmd+0x17a/0x200 > [ 746.152464] RSP <ffff8803a7f1dca8> > > > Thanks, > Sasha > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>