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memory leak in xas_create

Status: upstream: reported C repro on 2022/07/09 07:13
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+a785d07959bc94837d51@syzkaller.appspotmail.com
First crash: 1287d, last: 10h00m
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH] mm: khugepaged: fix memory leak in collapse_file rollback path 8 (8) 2025/11/24 17:37
[syzbot] Monthly mm report (Nov 2023) 0 (1) 2023/11/15 03:00
[syzbot] Monthly mm report (Sep 2023) 0 (1) 2023/09/11 10:07
[syzbot] memory leak in xas_create 9 (11) 2022/11/06 23:26
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
2025/11/04 03:58 11m retest repro upstream report log
2025/11/03 12:13 13m retest repro upstream report log
2025/11/02 17:12 12m retest repro upstream report log
2025/11/02 16:01 12m retest repro upstream report log
2025/09/12 20:28 23m retest repro upstream report log
2025/09/12 20:28 12m retest repro upstream report log
2025/09/12 19:53 13m retest repro upstream report log
2025/09/12 19:53 12m retest repro upstream report log
2025/09/12 19:31 15m retest repro upstream report log
2025/09/03 18:16 17m retest repro upstream report log
2022/07/10 16:42 5m code@siddh.me https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master error

Sample crash report:
BUG: memory leak
unreferenced object 0xffff888120c5a920 (size 576):
  comm "syz.0.17", pid 6098, jiffies 4294942472
  hex dump (first 32 bytes):
    06 24 08 00 00 00 00 00 00 00 00 00 00 00 00 00  .$..............
    98 b5 49 0d 81 88 ff ff 38 a9 c5 20 81 88 ff ff  ..I.....8.. ....
  backtrace (crc d863c595):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_lru_noprof+0x3bb/0x5a0 mm/slub.c:5282
    xas_alloc+0xf6/0x120 lib/xarray.c:378
    xas_expand lib/xarray.c:590 [inline]
    xas_create+0x103/0x820 lib/xarray.c:661
    xas_store+0x7b/0xad0 lib/xarray.c:795
    shmem_add_to_page_cache+0x378/0x460 mm/shmem.c:922
    shmem_alloc_and_add_folio+0x28f/0x6e0 mm/shmem.c:1958
    shmem_get_folio_gfp+0x371/0x9f0 mm/shmem.c:2556
    shmem_fault+0x93/0x4a0 mm/shmem.c:2757
    __do_fault+0x51/0x1a0 mm/memory.c:5320
    do_read_fault mm/memory.c:5755 [inline]
    do_fault+0x4cd/0xcd0 mm/memory.c:5889
    do_pte_missing mm/memory.c:4401 [inline]
    handle_pte_fault mm/memory.c:6273 [inline]
    __handle_mm_fault+0x1095/0x1e50 mm/memory.c:6411
    handle_mm_fault+0x31c/0x630 mm/memory.c:6580
    faultin_page mm/gup.c:1126 [inline]
    __get_user_pages+0x32d/0x1f30 mm/gup.c:1428
    populate_vma_page_range+0xfa/0x160 mm/gup.c:1860
    __mm_populate+0x122/0x270 mm/gup.c:1963
    mm_populate include/linux/mm.h:3701 [inline]
    vm_mmap_pgoff+0x226/0x2d0 mm/util.c:586

BUG: memory leak
unreferenced object 0xffff888120ca36d0 (size 576):
  comm "syz.0.17", pid 6098, jiffies 4294942477
  hex dump (first 32 bytes):
    00 0f 00 00 00 00 00 00 20 a9 c5 20 81 88 ff ff  ........ .. ....
    98 b5 49 0d 81 88 ff ff e8 36 ca 20 81 88 ff ff  ..I......6. ....
  backtrace (crc b68d08aa):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_lru_noprof+0x3bb/0x5a0 mm/slub.c:5282
    xas_alloc+0xf6/0x120 lib/xarray.c:378
    xas_create+0x48a/0x820 lib/xarray.c:685
    xas_create_range+0xb6/0x1b0 lib/xarray.c:725
    collapse_file+0x1e0/0x1ae0 mm/khugepaged.c:1891
    hpage_collapse_scan_file+0x613/0xb00 mm/khugepaged.c:2387
    madvise_collapse+0x1f7/0x650 mm/khugepaged.c:2810
    madvise_vma_behavior+0x6e2/0x1260 mm/madvise.c:1372
    madvise_walk_vmas+0x152/0x530 mm/madvise.c:1721
    madvise_do_behavior+0xc4/0x2e0 mm/madvise.c:1937
    do_madvise+0x118/0x1c0 mm/madvise.c:2030
    __do_sys_madvise mm/madvise.c:2039 [inline]
    __se_sys_madvise mm/madvise.c:2037 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2037
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888120ca3918 (size 576):
  comm "syz.0.17", pid 6098, jiffies 4294942477
  hex dump (first 32 bytes):
    00 0e 00 00 00 00 00 00 20 a9 c5 20 81 88 ff ff  ........ .. ....
    98 b5 49 0d 81 88 ff ff 30 39 ca 20 81 88 ff ff  ..I.....09. ....
  backtrace (crc 87da5b33):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_lru_noprof+0x3bb/0x5a0 mm/slub.c:5282
    xas_alloc+0xf6/0x120 lib/xarray.c:378
    xas_create+0x48a/0x820 lib/xarray.c:685
    xas_create_range+0xb6/0x1b0 lib/xarray.c:725
    collapse_file+0x1e0/0x1ae0 mm/khugepaged.c:1891
    hpage_collapse_scan_file+0x613/0xb00 mm/khugepaged.c:2387
    madvise_collapse+0x1f7/0x650 mm/khugepaged.c:2810
    madvise_vma_behavior+0x6e2/0x1260 mm/madvise.c:1372
    madvise_walk_vmas+0x152/0x530 mm/madvise.c:1721
    madvise_do_behavior+0xc4/0x2e0 mm/madvise.c:1937
    do_madvise+0x118/0x1c0 mm/madvise.c:2030
    __do_sys_madvise mm/madvise.c:2039 [inline]
    __se_sys_madvise mm/madvise.c:2037 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2037
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888120ca3b60 (size 576):
  comm "syz.0.17", pid 6098, jiffies 4294942477
  hex dump (first 32 bytes):
    00 0d 00 00 00 00 00 00 20 a9 c5 20 81 88 ff ff  ........ .. ....
    98 b5 49 0d 81 88 ff ff 78 3b ca 20 81 88 ff ff  ..I.....x;. ....
  backtrace (crc 8f1c7ee9):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_lru_noprof+0x3bb/0x5a0 mm/slub.c:5282
    xas_alloc+0xf6/0x120 lib/xarray.c:378
    xas_create+0x48a/0x820 lib/xarray.c:685
    xas_create_range+0xb6/0x1b0 lib/xarray.c:725
    collapse_file+0x1e0/0x1ae0 mm/khugepaged.c:1891
    hpage_collapse_scan_file+0x613/0xb00 mm/khugepaged.c:2387
    madvise_collapse+0x1f7/0x650 mm/khugepaged.c:2810
    madvise_vma_behavior+0x6e2/0x1260 mm/madvise.c:1372
    madvise_walk_vmas+0x152/0x530 mm/madvise.c:1721
    madvise_do_behavior+0xc4/0x2e0 mm/madvise.c:1937
    do_madvise+0x118/0x1c0 mm/madvise.c:2030
    __do_sys_madvise mm/madvise.c:2039 [inline]
    __se_sys_madvise mm/madvise.c:2037 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2037
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888120ca3da8 (size 576):
  comm "syz.0.17", pid 6098, jiffies 4294942477
  hex dump (first 32 bytes):
    00 0c 00 00 00 00 00 00 20 a9 c5 20 81 88 ff ff  ........ .. ....
    98 b5 49 0d 81 88 ff ff c0 3d ca 20 81 88 ff ff  ..I......=. ....
  backtrace (crc 2e8ec25c):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_lru_noprof+0x3bb/0x5a0 mm/slub.c:5282
    xas_alloc+0xf6/0x120 lib/xarray.c:378
    xas_create+0x48a/0x820 lib/xarray.c:685
    xas_create_range+0xb6/0x1b0 lib/xarray.c:725
    collapse_file+0x1e0/0x1ae0 mm/khugepaged.c:1891
    hpage_collapse_scan_file+0x613/0xb00 mm/khugepaged.c:2387
    madvise_collapse+0x1f7/0x650 mm/khugepaged.c:2810
    madvise_vma_behavior+0x6e2/0x1260 mm/madvise.c:1372
    madvise_walk_vmas+0x152/0x530 mm/madvise.c:1721
    madvise_do_behavior+0xc4/0x2e0 mm/madvise.c:1937
    do_madvise+0x118/0x1c0 mm/madvise.c:2030
    __do_sys_madvise mm/madvise.c:2039 [inline]
    __se_sys_madvise mm/madvise.c:2037 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2037
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/12 13:03 upstream 7143203341dc d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/01/10 03:50 upstream 372800cb95a3 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/01/05 14:30 upstream 3609fa95fb0f d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/12/27 21:22 upstream c53f467229a7 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/12/26 07:17 upstream ccd1cdca5cd4 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/12/23 22:50 upstream b927546677c8 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-leak memory leak in xas_create
2025/12/23 12:50 upstream b927546677c8 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/12/23 12:30 upstream b927546677c8 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/12/13 18:15 upstream 9551a26f17d9 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/12/01 16:26 upstream 7d0a66e4bb90 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/11/22 08:35 upstream 2eba5e05d9bc c31c1b0b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/11/21 01:38 upstream 23cb64fb7625 280ea308 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/11/08 23:02 upstream e811c33b1f13 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2025/11/04 06:16 upstream 8bb886cb8f3a 686bf657 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/11/06 23:26 upstream 2f5065a0bc9d 6d752409 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2023/07/27 00:33 upstream 5f0bc0b042fc 41fe1bae .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2023/07/26 09:30 upstream 18b44bc5a672 6756545c .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2023/05/05 12:04 upstream 3c4aa4434377 518a39a6 .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2023/03/01 23:32 upstream c0927a7a5391 f8902b57 .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2023/02/25 02:42 upstream d2980d8d8265 ee50e71c .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/11/13 13:55 upstream fef7fd48922d 3ead01ad .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/11/05 14:22 upstream 64c3dd0b98f5 6d752409 .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/11/01 15:16 upstream 5aaef24b5c6d a1d8560a .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/10/28 20:15 upstream 23758867219c ea12ae9b .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/10/22 00:36 upstream e35184f32151 4bfd3c27 .config console log report syz [disk image] [vmlinux] ci-upstream-gce-leak memory leak in xas_create
2023/11/08 06:03 upstream 13d88ac54ddd 83211397 .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2022/08/28 12:43 upstream 10d4879f9ef0 07177916 .config console log report syz ci-upstream-gce-leak memory leak in xas_create
2022/07/05 07:03 upstream c1084b6c5620 bff65f44 .config console log report syz ci-upstream-gce-leak memory leak in xas_create
2023/10/19 09:53 upstream dd72f9c7e512 342b9c55 .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
* Struck through repros no longer work on HEAD.