On 06/16/22 10:48, Yang Shi wrote: > This series is the follow-up of the discussion about cleaning up transhuge_xxx > helpers at https://lore.kernel.org/linux-mm/627a71f8-e879-69a5-ceb3-fc8d29d2f7f1@xxxxxxx/. > > THP has a bunch of helpers that do VMA sanity check for different paths, they > do the similar checks for the most callsites and have a lot duplicate codes. > And it is confusing what helpers should be used at what conditions. > > This series reorganized and cleaned up the code so that we could consolidate > all the checks into hugepage_vma_check(). > > The transhuge_vma_enabled(), transparent_hugepage_active() and > __transparent_hugepage_enabled() are killed by this series. Running libhugetlbfs tests on next-20220621 produces the following: [ 77.436038] BUG: kernel NULL pointer dereference, address: 0000000000000378 [ 77.437278] #PF: supervisor read access in kernel mode [ 77.438211] #PF: error_code(0x0000) - not-present page [ 77.439097] PGD 800000017a1a6067 P4D 800000017a1a6067 PUD 17f3b9067 PMD 0 [ 77.440021] Oops: 0000 [#7] PREEMPT SMP PTI [ 77.440635] CPU: 1 PID: 2720 Comm: get_huge_pages Tainted: G D 5.19.0-rc3-next-20220621+ #22 [ 77.441973] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1.fc35 04/01/2014 [ 77.443115] RIP: 0010:hugepage_vma_check+0x15/0x170 [ 77.444021] Code: 01 e9 84 fd ff ff 48 89 d8 e9 14 ff ff ff 0f 1f 80 00 00 00 00 0f 1f 44 00 00 f7 c6 00 00 00 40 0f 85 fe 00 00 00 48 8b 47 10 <48> 8b 80 78 03 00 00 48 c1 e8 18 83 e0 01 0f 85 e6 00 00 00 4c 8b [ 77.447327] RSP: 0018:ffffc900039dfd20 EFLAGS: 00010246 [ 77.448317] RAX: 0000000000000000 RBX: ffff88817e4b27a0 RCX: 0000000000000000 [ 77.449681] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff823f2000 [ 77.451040] RBP: ffffffff823f2000 R08: 0000000000000008 R09: ffff8881a3c042e6 [ 77.452353] R10: 00007ffe8b341000 R11: ffff8881a3c04526 R12: ffff88817e4b27a0 [ 77.453677] R13: ffffc900039dfd28 R14: ffff88817e4b27c8 R15: ffffffff823f2000 [ 77.455046] FS: 00007f0edc9880c0(0000) GS:ffff888277d00000(0000) knlGS:0000000000000000 [ 77.456625] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.457745] CR2: 0000000000000378 CR3: 0000000179394006 CR4: 0000000000370ee0 [ 77.459936] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.461308] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.462477] Call Trace: [ 77.462950] <TASK> [ 77.463402] show_smap+0xed/0x1c0 [ 77.464019] seq_read_iter+0x2af/0x480 [ 77.464674] seq_read+0xeb/0x120 [ 77.465286] vfs_read+0x97/0x190 [ 77.465880] ksys_read+0x5f/0xe0 [ 77.466488] do_syscall_64+0x3b/0x90 [ 77.467155] entry_SYSCALL_64_after_hwframe+0x46/0xb0 [ 77.468023] RIP: 0033:0x7f0edca7ade2 [ 77.468609] Code: c0 e9 b2 fe ff ff 50 48 8d 3d b2 3f 0a 00 e8 05 f0 01 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24 [ 77.471492] RSP: 002b:00007ffe8b324c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 77.472845] RAX: ffffffffffffffda RBX: 00000000022f82a0 RCX: 00007f0edca7ade2 [ 77.474017] RDX: 0000000000000400 RSI: 00000000022f8480 RDI: 0000000000000003 [ 77.475184] RBP: 00007f0edcb4f320 R08: 0000000000000003 R09: 0000000000000000 [ 77.476379] R10: 00007f0edcaffac0 R11: 0000000000000246 R12: 00000000022f82a0 [ 77.477517] R13: 0000000000000d68 R14: 00007f0edcb4e720 R15: 0000000000000d68 [ 77.478590] </TASK> [ 77.479012] Modules linked in: rfkill ip6table_filter ip6_tables sunrpc snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core snd_seq snd_seq_device snd_pcm joydev snd_timer 9p netfs 9pnet_virtio snd soundcore virtio_balloon 9pnet virtio_console virtio_blk virtio_net net_failover failover crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel serio_raw virtio_pci virtio virtio_ring virtio_pci_legacy_dev virtio_pci_modern_dev fuse [ 77.484573] CR2: 0000000000000378 [ 77.485123] ---[ end trace 0000000000000000 ]--- Looks to be related to this series. I'll start debugging unless someone knows what the issue may be. -- Mike Kravetz
