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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: 1333d, last: 5d23h
▶ ▼ 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
2026/02/18 12:36 20m retest repro upstream report log
2026/02/18 12:36 12m retest repro upstream report log
2026/02/18 12:36 17m retest repro upstream report log
2026/02/18 12:36 22m retest repro upstream report log
2026/02/18 12:36 13m retest repro upstream report log
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
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 0xffff88812a70f240 (size 576):
  comm "syz.2.148", pid 6833, jiffies 4294951550
  hex dump (first 32 bytes):
    06 3b 08 00 00 00 00 00 00 00 00 00 00 00 00 00  .;..............
    10 02 d8 0a 81 88 ff ff 58 f2 70 2a 81 88 ff ff  ........X.p*....
  backtrace (crc ae801180):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4506 [inline]
    slab_alloc_node mm/slub.c:4830 [inline]
    kmem_cache_alloc_lru_noprof+0x37d/0x490 mm/slub.c:4849
    xas_alloc+0xf1/0x110 lib/xarray.c:378
    xas_expand lib/xarray.c:590 [inline]
    xas_create+0x105/0x8a0 lib/xarray.c:661
    xas_store+0x7a/0xb20 lib/xarray.c:795
    shmem_add_to_page_cache+0x39f/0x490 mm/shmem.c:922
    shmem_alloc_and_add_folio+0x30c/0x6d0 mm/shmem.c:1998
    shmem_get_folio_gfp+0x3b2/0x9d0 mm/shmem.c:2567
    shmem_fault+0x91/0x490 mm/shmem.c:2768
    __do_fault+0x51/0x1a0 mm/memory.c:5363
    do_read_fault mm/memory.c:5798 [inline]
    do_fault+0x671/0xb50 mm/memory.c:5932
    do_pte_missing mm/memory.c:4477 [inline]
    handle_pte_fault mm/memory.c:6316 [inline]
    __handle_mm_fault+0x1022/0x1df0 mm/memory.c:6454
    handle_mm_fault+0x216/0x630 mm/memory.c:6623
    faultin_page mm/gup.c:1126 [inline]
    __get_user_pages+0x967/0x1f10 mm/gup.c:1428
    populate_vma_page_range+0xf8/0x160 mm/gup.c:1860
    __mm_populate+0x93/0x270 mm/gup.c:1963
    mm_populate include/linux/mm.h:3899 [inline]
    vm_mmap_pgoff+0x226/0x2d0 mm/util.c:586

BUG: memory leak
unreferenced object 0xffff88810f36f918 (size 576):
  comm "syz.2.148", pid 6854, jiffies 4294951566
  hex dump (first 32 bytes):
    00 0f 00 00 00 00 00 00 40 f2 70 2a 81 88 ff ff  ........@.p*....
    10 02 d8 0a 81 88 ff ff 30 f9 36 0f 81 88 ff ff  ........0.6.....
  backtrace (crc a3f89955):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4506 [inline]
    slab_alloc_node mm/slub.c:4830 [inline]
    kmem_cache_alloc_lru_noprof+0x37d/0x490 mm/slub.c:4849
    xas_alloc+0xf1/0x110 lib/xarray.c:378
    xas_create+0x40d/0x8a0 lib/xarray.c:685
    xas_create_range+0xb5/0x1b0 lib/xarray.c:725
    collapse_file+0x209/0x1b70 mm/khugepaged.c:1883
    hpage_collapse_scan_file+0x3b8/0xb10 mm/khugepaged.c:2380
    madvise_collapse+0x22a/0x700 mm/khugepaged.c:2809
    madvise_vma_behavior+0xb05/0x1310 mm/madvise.c:1370
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1719
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1935
    do_madvise+0x137/0x1c0 mm/madvise.c:2028
    __do_sys_madvise mm/madvise.c:2037 [inline]
    __se_sys_madvise mm/madvise.c:2035 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2035
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810f3a3488 (size 576):
  comm "syz.2.148", pid 6854, jiffies 4294951566
  hex dump (first 32 bytes):
    00 0e 00 00 00 00 00 00 40 f2 70 2a 81 88 ff ff  ........@.p*....
    10 02 d8 0a 81 88 ff ff a0 34 3a 0f 81 88 ff ff  .........4:.....
  backtrace (crc d5dc5a76):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4506 [inline]
    slab_alloc_node mm/slub.c:4830 [inline]
    kmem_cache_alloc_lru_noprof+0x37d/0x490 mm/slub.c:4849
    xas_alloc+0xf1/0x110 lib/xarray.c:378
    xas_create+0x40d/0x8a0 lib/xarray.c:685
    xas_create_range+0xb5/0x1b0 lib/xarray.c:725
    collapse_file+0x209/0x1b70 mm/khugepaged.c:1883
    hpage_collapse_scan_file+0x3b8/0xb10 mm/khugepaged.c:2380
    madvise_collapse+0x22a/0x700 mm/khugepaged.c:2809
    madvise_vma_behavior+0xb05/0x1310 mm/madvise.c:1370
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1719
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1935
    do_madvise+0x137/0x1c0 mm/madvise.c:2028
    __do_sys_madvise mm/madvise.c:2037 [inline]
    __se_sys_madvise mm/madvise.c:2035 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2035
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88812a70f6d0 (size 576):
  comm "syz.2.148", pid 6854, jiffies 4294951566
  hex dump (first 32 bytes):
    00 0d 00 00 00 00 00 00 40 f2 70 2a 81 88 ff ff  ........@.p*....
    10 02 d8 0a 81 88 ff ff e8 f6 70 2a 81 88 ff ff  ..........p*....
  backtrace (crc 9b6ac4c6):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4506 [inline]
    slab_alloc_node mm/slub.c:4830 [inline]
    kmem_cache_alloc_lru_noprof+0x37d/0x490 mm/slub.c:4849
    xas_alloc+0xf1/0x110 lib/xarray.c:378
    xas_create+0x40d/0x8a0 lib/xarray.c:685
    xas_create_range+0xb5/0x1b0 lib/xarray.c:725
    collapse_file+0x209/0x1b70 mm/khugepaged.c:1883
    hpage_collapse_scan_file+0x3b8/0xb10 mm/khugepaged.c:2380
    madvise_collapse+0x22a/0x700 mm/khugepaged.c:2809
    madvise_vma_behavior+0xb05/0x1310 mm/madvise.c:1370
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1719
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1935
    do_madvise+0x137/0x1c0 mm/madvise.c:2028
    __do_sys_madvise mm/madvise.c:2037 [inline]
    __se_sys_madvise mm/madvise.c:2035 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2035
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88812a6e2b68 (size 576):
  comm "syz.2.148", pid 6854, jiffies 4294951566
  hex dump (first 32 bytes):
    00 0c 00 00 00 00 00 00 40 f2 70 2a 81 88 ff ff  ........@.p*....
    10 02 d8 0a 81 88 ff ff 80 2b 6e 2a 81 88 ff ff  .........+n*....
  backtrace (crc ddc01020):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4506 [inline]
    slab_alloc_node mm/slub.c:4830 [inline]
    kmem_cache_alloc_lru_noprof+0x37d/0x490 mm/slub.c:4849
    xas_alloc+0xf1/0x110 lib/xarray.c:378
    xas_create+0x40d/0x8a0 lib/xarray.c:685
    xas_create_range+0xb5/0x1b0 lib/xarray.c:725
    collapse_file+0x209/0x1b70 mm/khugepaged.c:1883
    hpage_collapse_scan_file+0x3b8/0xb10 mm/khugepaged.c:2380
    madvise_collapse+0x22a/0x700 mm/khugepaged.c:2809
    madvise_vma_behavior+0xb05/0x1310 mm/madvise.c:1370
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1719
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1935
    do_madvise+0x137/0x1c0 mm/madvise.c:2028
    __do_sys_madvise mm/madvise.c:2037 [inline]
    __se_sys_madvise mm/madvise.c:2035 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2035
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

Crashes (34):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/21 15:30 upstream a95f71ad3e2e 6e7b5511 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-leak memory leak in xas_create
2026/02/04 11:24 upstream de0674d9bc69 42b01fab .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/01/16 20:50 upstream 983d014aafb1 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/01/16 18:45 upstream 983d014aafb1 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
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
2026/01/28 19:34 upstream 1f97d9dcf536 004c195c .config console log report syz / log [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.