From: Nathan Chancellor <nathan@kernel.org>
To: Liam Howlett <liam.howlett@oracle.com>
Cc: "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>, Yu Zhao <yuzhao@google.com>
Subject: Re: [PATCH v12 08/69] mm: start tracking VMAs with maple tree
Date: Tue, 26 Jul 2022 17:28:16 -0700 [thread overview]
Message-ID: <YuCGoB3Ackadj5up@dev-arch.thelio-3990X> (raw)
In-Reply-To: <20220720021727.17018-9-Liam.Howlett@oracle.com>
Hi Liam,
On Wed, Jul 20, 2022 at 02:17:45AM +0000, Liam Howlett wrote:
> From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
>
> Start tracking the VMAs with the new maple tree structure in parallel with
> the rb_tree. Add debug and trace events for maple tree operations and
> duplicate the rb_tree that is created on forks into the maple tree.
>
> The maple tree is added to the mm_struct including the mm_init struct,
> added support in required mm/mmap functions, added tracking in kernel/fork
> for process forking, and used to find the unmapped_area and checked
> against what the rbtree finds.
>
> This also moves the mmap_lock() in exit_mmap() since the oom reaper call
> does walk the VMAs. Otherwise lockdep will be unhappy if oom happens.
>
> When splitting a vma fails due to allocations of the maple tree nodes,
> the error path in __split_vma() calls new->vm_ops->close(new). The page
> accounting for hugetlb is actually in the close() operation, so it
> accounts for the removal of 1/2 of the VMA which was not adjusted. This
> results in a negative exit value. To avoid the negative charge, set
> vm_start = vm_end and vm_pgoff = 0.
>
> There is also a potential accounting issue in special mappings from
> insert_vm_struct() failing to allocate, so reverse the charge there in
> the failure scenario.
>
> Link: https://lkml.kernel.org/r/20220504010716.661115-10-Liam.Howlett@oracle.com
> Link: https://lkml.kernel.org/r/20220621204632.3370049-9-Liam.Howlett@oracle.com
> Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: David Howells <dhowells@redhat.com>
> Cc: SeongJae Park <sj@kernel.org>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Will Deacon <will@kernel.org>
> Cc: Davidlohr Bueso <dave@stgolabs.net>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Apologies if this has been reported already, I tried searching the
mailing lists but I did not really find anything.
I bisected my arm64 test system failing to boot to this change as commit
fdfbd22f37db ("mm: start tracking VMAs with maple tree") in
next-20220726 (bisect log at the end).
[ 4.295886] Unable to handle kernel access to user memory outside uaccess routines at virtual address 0000000000000000
[ 4.306595] Mem abort info:
[ 4.309381] ESR = 0x0000000096000044
[ 4.313118] EC = 0x25: DABT (current EL), IL = 32 bits
[ 4.318422] SET = 0, FnV = 0
[ 4.321464] EA = 0, S1PTW = 0
[ 4.324592] FSC = 0x04: level 0 translation fault
[ 4.329461] Data abort info:
[ 4.332329] ISV = 0, ISS = 0x00000044
[ 4.336152] CM = 0, WnR = 1
[ 4.339110] user pgtable: 4k pages, 48-bit VAs, pgdp=00000020a9712000
[ 4.345539] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
[ 4.352321] Internal error: Oops: 96000044 [#1] SMP
[ 4.357188] Modules linked in:
[ 4.360232] CPU: 6 PID: 264 Comm: dracut-rootfs-g Not tainted 5.19.0-rc4-00288-gfdfbd22f37db #1
[ 4.368918] Hardware name: SolidRun Ltd. SolidRun CEX7 Platform, BIOS EDK II Jun 21 2022
[ 4.376994] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 4.383943] pc : mas_split.isra.0+0x50c/0x784
[ 4.388295] lr : mas_split.isra.0+0x204/0x784
[ 4.392640] sp : ffff8000094a3510
[ 4.395942] x29: ffff8000094a3510 x28: ffff08dd66c0c000 x27: ffff8000094a3610
[ 4.403067] x26: ffff8000094a35d0 x25: ffff8000094a3578 x24: ffffd823cb5448b8
[ 4.410192] x23: ffff8000094a3650 x22: ffff8000094a3690 x21: ffff8000094a3738
[ 4.417316] x20: 0000000000000002 x19: ffff8000094a3af0 x18: 0000000000000002
[ 4.424441] x17: 0000000000000000 x16: ffff08dd66c45450 x15: 0000000000000000
[ 4.431565] x14: ffff08dd66c459c8 x13: ffff8000094a3748 x12: 0000000000000001
[ 4.438689] x11: ffff8000094a3610 x10: 0000000000000003 x9 : ffff08dd66c47300
[ 4.445813] x8 : 000000000000001c x7 : 0000000000000003 x6 : 0000000000000006
[ 4.452937] x5 : ffff08dd68a44409 x4 : 0000000000000001 x3 : ffff8000094a35d0
[ 4.460061] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff8000094a3738
[ 4.467186] Call trace:
[ 4.469620] mas_split.isra.0+0x50c/0x784
[ 4.473618] mas_commit_b_node.isra.0+0x1e0/0x274
[ 4.478311] mas_wr_modify+0x10c/0x28c
[ 4.482048] mas_wr_store_entry.isra.0+0x10c/0x4a0
[ 4.486827] mas_store+0x48/0x110
[ 4.490131] dup_mmap+0x268/0x514
[ 4.493436] dup_mm+0x68/0xfc
[ 4.496391] copy_process+0x864/0x10b4
[ 4.500129] kernel_clone+0x88/0x494
[ 4.503692] __do_sys_clone+0x60/0x80
[ 4.507342] __arm64_sys_clone+0x2c/0x40
[ 4.511254] invoke_syscall+0x78/0x100
[ 4.514991] el0_svc_common.constprop.0+0x4c/0xf4
[ 4.519683] do_el0_svc+0x38/0x4c
[ 4.522985] el0_svc+0x34/0x100
[ 4.526115] el0t_64_sync_handler+0x11c/0x150
[ 4.530460] el0t_64_sync+0x190/0x194
[ 4.534112] Code: f9000125 f9400e65 9278dca5 f94000a5 (f9000045)
[ 4.540193] ---[ end trace 0000000000000000 ]---
I was also able to reproduce the same crash in a Fedora virtual machine
using QEMU with Fedora's rawhide configuration [1]:
[ 5.913992] Unable to handle kernel access to user memory outside uaccess routines at virtual address 0000000000000000
[ 5.914510] Mem abort info:
[ 5.914581] ESR = 0x0000000096000044
[ 5.914705] EC = 0x25: DABT (current EL), IL = 32 bits
[ 5.914858] SET = 0, FnV = 0
[ 5.914951] EA = 0, S1PTW = 0
[ 5.915065] FSC = 0x04: level 0 translation fault
[ 5.915215] Data abort info:
[ 5.915321] ISV = 0, ISS = 0x00000044
[ 5.915465] CM = 0, WnR = 1
[ 5.915624] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000103051000
[ 5.915799] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
[ 5.916196] Internal error: Oops: 96000044 [#1] SMP
[ 5.916504] Modules linked in:
[ 5.916771] CPU: 2 PID: 202 Comm: dracut-rootfs-g Not tainted 5.19.0-rc4+ #1
[ 5.917003] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
[ 5.917339] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 5.917584] pc : mas_split.isra.0+0x50c/0x784
[ 5.917794] lr : mas_split.isra.0+0x204/0x784
[ 5.917949] sp : ffff8000086334a0
[ 5.918038] x29: ffff8000086334a0 x28: ffff5b65c095a258 x27: ffff8000086335a0
[ 5.918289] x26: ffff800008633560 x25: ffff800008633508 x24: ffffdb30c80d9778
[ 5.918844] x23: ffff8000086335e0 x22: ffff800008633620 x21: ffff8000086336c8
[ 5.919277] x20: 0000000000000002 x19: ffff800008633a80 x18: 0000000000000002
[ 5.919533] x17: 0000000000000000 x16: ffff5b65c095a4b0 x15: 0000000000000000
[ 5.919747] x14: ffff5b65c095a898 x13: ffff8000086336d8 x12: 0000000000000001
[ 5.919971] x11: ffff8000086335a0 x10: 0000000000000003 x9 : ffff5b66f42e2a00
[ 5.920214] x8 : 000000000000001c x7 : 0000000000000003 x6 : 0000000000000006
[ 5.920493] x5 : ffff5b65c3077309 x4 : 0000000000000001 x3 : ffff800008633560
[ 5.920739] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff8000086336c8
[ 5.921051] Call trace:
[ 5.921152] mas_split.isra.0+0x50c/0x784
[ 5.921303] mas_commit_b_node.isra.0+0x1e0/0x274
[ 5.921459] mas_wr_modify+0x10c/0x28c
[ 5.921565] mas_wr_store_entry.isra.0+0x10c/0x4a0
[ 5.921725] mas_store+0x48/0x110
[ 5.921864] dup_mmap+0x268/0x514
[ 5.921993] dup_mm+0x68/0xfc
[ 5.922074] copy_process+0x864/0x10b4
[ 5.922213] kernel_clone+0x88/0x494
[ 5.922315] __do_sys_clone+0x60/0x80
[ 5.922444] __arm64_sys_clone+0x2c/0x40
[ 5.922576] invoke_syscall+0x78/0x100
[ 5.922686] el0_svc_common.constprop.0+0x4c/0xf4
[ 5.922847] do_el0_svc+0x38/0x4c
[ 5.922947] el0_svc+0x34/0x100
[ 5.923056] el0t_64_sync_handler+0x11c/0x150
[ 5.923179] el0t_64_sync+0x190/0x194
[ 5.923365] Code: f9000125 f9400e65 9278dca5 f94000a5 (f9000045)
[ 5.923833] ---[ end trace 0000000000000000 ]---
If there is any additional information I can provide or patches I can
test, please let me know!
Cheers,
Nathan
[1]: https://src.fedoraproject.org/rpms/kernel/raw/rawhide/f/kernel-aarch64-fedora.config
# bad: [058affafc65a74cf54499fb578b66ad0b18f939b] Add linux-next specific files for 20220726
# good: [e0dccc3b76fb35bb257b4118367a883073d7390e] Linux 5.19-rc8
git bisect start '058affafc65a74cf54499fb578b66ad0b18f939b' 'e0dccc3b76fb35bb257b4118367a883073d7390e'
# good: [e9173a7b08211b52862d61e7cdc8899fc5e6a44d] Merge branch 'drm-next' of git://git.freedesktop.org/git/drm/drm.git
git bisect good e9173a7b08211b52862d61e7cdc8899fc5e6a44d
# good: [45dfa9ecc6a971ab9217e41c1e2ea3ee98fd0f70] Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm.git
git bisect good 45dfa9ecc6a971ab9217e41c1e2ea3ee98fd0f70
# good: [1991de2cb33a921c5a422e749eaba9067b9e8a29] Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
git bisect good 1991de2cb33a921c5a422e749eaba9067b9e8a29
# good: [21a47601220fc0b93b7ab254381b2a3ef1f6d3fe] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock.git
git bisect good 21a47601220fc0b93b7ab254381b2a3ef1f6d3fe
# bad: [2a210fe818f13dfe3342eb117a4bfeb36aad8215] mm: khugepaged: don't carry huge page to the next loop for !CONFIG_NUMA
git bisect bad 2a210fe818f13dfe3342eb117a4bfeb36aad8215
# good: [43957b5d11037a651d162f65c682ec3c76777fc8] mm/mmap: define DECLARE_VM_GET_PAGE_PROT
git bisect good 43957b5d11037a651d162f65c682ec3c76777fc8
# good: [e3e449def7ea1d17e890408ea01013592e65298b] radix tree test suite: add pr_err define
git bisect good e3e449def7ea1d17e890408ea01013592e65298b
# bad: [c1870dd3ebf1f8a1337f10f2b2ef97e0c1d7e03a] ipc/shm: use VMA iterator instead of linked list
git bisect bad c1870dd3ebf1f8a1337f10f2b2ef97e0c1d7e03a
# bad: [5f9f7cac1a89ff1c7d111dfc7edbcb1b0987000a] mm: use maple tree operations for find_vma_intersection()
git bisect bad 5f9f7cac1a89ff1c7d111dfc7edbcb1b0987000a
# bad: [3b6a687016b08feb5c1b8d9fb78b31dcb314674d] mm/mmap: use maple tree for unmapped_area{_topdown}
git bisect bad 3b6a687016b08feb5c1b8d9fb78b31dcb314674d
# good: [264f03ef6aaca0d56e1c6efed11c93680b8156ac] lib/test_maple_tree: add testing for maple tree
git bisect good 264f03ef6aaca0d56e1c6efed11c93680b8156ac
# bad: [bea49723f45480acf67f46f6fd76bc5cde941e5d] mmap: use the VMA iterator in count_vma_pages_range()
git bisect bad bea49723f45480acf67f46f6fd76bc5cde941e5d
# bad: [423dbb83d4e1b9e894a2309a0035284eb20d9f2b] mm: add VMA iterator
git bisect bad 423dbb83d4e1b9e894a2309a0035284eb20d9f2b
# bad: [fdfbd22f37db37d2db32411d7f48c57bc810366b] mm: start tracking VMAs with maple tree
git bisect bad fdfbd22f37db37d2db32411d7f48c57bc810366b
# first bad commit: [fdfbd22f37db37d2db32411d7f48c57bc810366b] mm: start tracking VMAs with maple tree
next prev parent reply other threads:[~2022-07-27 0:28 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-20 2:17 [PATCH v12 00/69] Introducing the Maple Tree Liam Howlett
2022-07-20 2:17 ` [PATCH v12 01/69] Maple Tree: add new data structure Liam Howlett
2022-07-20 2:17 ` [PATCH v12 03/69] radix tree test suite: add kmem_cache_set_non_kernel() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 02/69] radix tree test suite: add pr_err define Liam Howlett
2022-07-20 2:17 ` [PATCH v12 04/69] radix tree test suite: add allocation counts and size to kmem_cache Liam Howlett
2022-07-20 2:17 ` [PATCH v12 05/69] radix tree test suite: add support for slab bulk APIs Liam Howlett
2022-07-20 2:17 ` [PATCH v12 06/69] radix tree test suite: add lockdep_is_held to header Liam Howlett
2022-07-20 2:17 ` [PATCH v12 07/69] lib/test_maple_tree: add testing for maple tree Liam Howlett
2022-07-20 2:17 ` [PATCH v12 08/69] mm: start tracking VMAs with " Liam Howlett
2022-07-27 0:28 ` Nathan Chancellor [this message]
2022-07-28 0:34 ` Liam Howlett
2022-07-29 15:41 ` Liam Howlett
2022-07-29 17:02 ` Nathan Chancellor
2022-07-29 20:13 ` Liam Howlett
2022-07-20 2:17 ` [PATCH v12 09/69] mm: add VMA iterator Liam Howlett
2022-07-20 2:17 ` [PATCH v12 10/69] mmap: use the VMA iterator in count_vma_pages_range() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 11/69] mm/mmap: use the maple tree in find_vma() instead of the rbtree Liam Howlett
2022-07-20 2:17 ` [PATCH v12 12/69] mm/mmap: use the maple tree for find_vma_prev() " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 13/69] mm/mmap: use maple tree for unmapped_area{_topdown} Liam Howlett
2022-07-20 2:17 ` [PATCH v12 15/69] damon: convert __damon_va_three_regions to use the VMA iterator Liam Howlett
2022-07-20 2:17 ` [PATCH v12 14/69] kernel/fork: use maple tree for dup_mmap() during forking Liam Howlett
2022-07-20 2:17 ` [PATCH v12 16/69] proc: remove VMA rbtree use from nommu Liam Howlett
2022-07-20 2:17 ` [PATCH v12 17/69] mm: remove rb tree Liam Howlett
2022-07-20 2:17 ` [PATCH v12 19/69] xen: use vma_lookup() in privcmd_ioctl_mmap() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 18/69] mmap: change zeroing of maple tree in __vma_adjust() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 21/69] mm/khugepaged: optimize collapse_pte_mapped_thp() by using vma_lookup() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 22/69] mm/mmap: change do_brk_flags() to expand existing VMA and add do_brk_munmap() Liam Howlett
[not found] ` <f5e99dbb-7008-dcf8-3e85-2f161056b37a@gmail.com>
2022-07-25 14:01 ` Liam Howlett
2022-07-25 18:49 ` Liam Howlett
[not found] ` <8d77a517-fcc1-5e74-b9d8-2a250dc751ed@gmail.com>
2022-07-28 0:57 ` Liam Howlett
2022-07-20 2:17 ` [PATCH v12 20/69] mm: optimize find_exact_vma() to use vma_lookup() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 24/69] mm/mmap: use advanced maple tree API for mmap_region() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 23/69] mm: use maple tree operations for find_vma_intersection() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 25/69] mm: remove vmacache Liam Howlett
2022-07-20 2:17 ` [PATCH v12 26/69] mm: convert vma_lookup() to use mtree_load() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 27/69] mm/mmap: move mmap_region() below do_munmap() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 28/69] mm/mmap: reorganize munmap to use maple states Liam Howlett
2022-07-20 2:17 ` [PATCH v12 29/69] mm/mmap: change do_brk_munmap() to use do_mas_align_munmap() Liam Howlett
2022-07-20 2:17 ` [PATCH v12 30/69] arm64: remove mmap linked list from vdso Liam Howlett
2022-07-20 2:17 ` [PATCH v12 32/69] parisc: remove mmap linked list from cache handling Liam Howlett
2022-07-20 2:17 ` [PATCH v12 31/69] arm64: Change elfcore for_each_mte_vma() to use VMA iterator Liam Howlett
2022-07-20 2:17 ` [PATCH v12 33/69] powerpc: remove mmap linked list walks Liam Howlett
2022-08-02 10:36 ` Christophe Leroy
2022-07-20 2:17 ` [PATCH v12 36/69] xtensa: remove vma " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 35/69] x86: " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 34/69] s390: " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 40/69] coredump: remove vma linked list walk Liam Howlett
2022-07-20 2:17 ` [PATCH v12 38/69] optee: " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 37/69] cxl: " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 39/69] um: " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 42/69] fs/proc/base: use maple tree iterators in place of linked list Liam Howlett
2022-07-20 2:17 ` [PATCH v12 43/69] fs/proc/task_mmu: stop using linked list and highest_vm_end Liam Howlett
2022-07-20 2:17 ` [PATCH v12 44/69] userfaultfd: use maple tree iterator to iterate VMAs Liam Howlett
2022-07-20 2:17 ` [PATCH v12 41/69] exec: use VMA iterator instead of linked list Liam Howlett
2022-07-20 2:17 ` [PATCH v12 47/69] perf: use VMA iterator Liam Howlett
2022-07-20 2:17 ` [PATCH v12 46/69] acct: use VMA iterator instead of linked list Liam Howlett
2022-07-20 2:17 ` [PATCH v12 45/69] ipc/shm: " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 48/69] sched: use maple tree iterator to walk VMAs Liam Howlett
2022-07-20 2:17 ` [PATCH v12 51/69] mm/gup: use maple tree navigation instead of linked list Liam Howlett
2022-07-20 2:17 ` [PATCH v12 50/69] bpf: remove VMA " Liam Howlett
2022-07-20 2:17 ` [PATCH v12 49/69] fork: use VMA iterator Liam Howlett
2022-07-20 2:18 ` [PATCH v12 53/69] mm/ksm: use vma iterators instead of vma linked list Liam Howlett
2022-07-20 2:18 ` [PATCH v12 52/69] mm/khugepaged: stop using " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 54/69] mm/madvise: use vma_find() instead of " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 57/69] mm/mlock: use vma iterator and maple state " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 58/69] mm/mprotect: use maple tree navigation " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 56/69] mm/mempolicy: use vma iterator & maple state " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 55/69] mm/memcontrol: stop using mm->highest_vm_end Liam Howlett
2022-07-20 2:18 ` [PATCH v12 59/69] mm/mremap: use vma_find_intersection() instead of vma linked list Liam Howlett
2022-07-20 2:18 ` [PATCH v12 62/69] mm/pagewalk: use vma_find() " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 61/69] mm/oom_kill: use maple tree iterators " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 60/69] mm/msync: use vma_find() " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 63/69] mm/swapfile: use vma iterator " Liam Howlett
2022-07-20 2:18 ` [PATCH v12 64/69] i915: use the VMA iterator Liam Howlett
2022-07-20 2:18 ` [PATCH v12 65/69] nommu: remove uses of VMA linked list Liam Howlett
2022-07-20 2:18 ` [PATCH v12 66/69] riscv: use vma iterator for vdso Liam Howlett
2022-07-20 2:18 ` [PATCH v12 68/69] mm/mmap: drop range_has_overlap() function Liam Howlett
2022-07-20 2:18 ` [PATCH v12 67/69] mm: remove the vma linked list Liam Howlett
2022-07-20 2:18 ` [PATCH v12 69/69] mm/mmap.c: pass in mapping to __vma_link_file() Liam Howlett
2022-07-20 5:09 ` [PATCH v12 00/69] Introducing the Maple Tree Andrew Morton
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