syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1344]
≡ Subsystems
🐞 Fixed [7066]
🐞 Invalid [18560]
⬇ Missing Backports [222]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

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: 1387d, last: 1d00h
▶ ▼ 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
2026/04/09 12:49 21m retest repro upstream report log
2026/04/09 12:49 19m retest repro upstream OK log
2026/04/09 12:49 17m retest repro upstream report log
2026/04/09 12:49 21m retest repro upstream report log
2026/04/09 12:49 12m retest repro upstream report log
2026/03/23 22:20 19m retest repro upstream report log
2026/03/23 22:20 12m retest repro upstream report log
2026/03/23 22:20 12m retest repro upstream report log
2026/03/23 22:20 24m retest repro upstream report log
2026/03/23 22:20 20m retest repro upstream OK 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:
2026/04/22 05:17:31 executed programs: 11
2026/04/22 05:17:37 executed programs: 13
2026/04/22 05:17:43 executed programs: 15
2026/04/22 05:17:49 executed programs: 17
BUG: memory leak
unreferenced object 0xffff888110a14000 (size 576):
  comm "syz.0.25", pid 6149, jiffies 4294944705
  hex dump (first 32 bytes):
    06 20 07 00 00 00 00 00 00 00 00 00 00 00 00 00  . ..............
    60 a9 0f 0f 81 88 ff ff 18 40 a1 10 81 88 ff ff  `........@......
  backtrace (crc 9a22f11f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    kmem_cache_alloc_lru_noprof+0x377/0x490 mm/slub.c:4917
    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+0x209/0x1b30 mm/khugepaged.c:1916
    collapse_scan_file mm/khugepaged.c:2412 [inline]
    collapse_single_pmd+0x85c/0x18d0 mm/khugepaged.c:2447
    madvise_collapse+0x173/0x450 mm/khugepaged.c:2869
    madvise_vma_behavior+0x9ae/0xf80 mm/madvise.c:1364
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1713
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1929
    do_madvise+0x137/0x1c0 mm/madvise.c:2022
    __do_sys_madvise mm/madvise.c:2031 [inline]
    __se_sys_madvise mm/madvise.c:2029 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2029
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888110a0a490 (size 576):
  comm "syz.0.25", pid 6149, jiffies 4294944705
  hex dump (first 32 bytes):
    00 07 00 00 00 00 00 00 00 40 a1 10 81 88 ff ff  .........@......
    60 a9 0f 0f 81 88 ff ff a8 a4 a0 10 81 88 ff ff  `...............
  backtrace (crc 4830383a):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    kmem_cache_alloc_lru_noprof+0x377/0x490 mm/slub.c:4917
    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+0x209/0x1b30 mm/khugepaged.c:1916
    collapse_scan_file mm/khugepaged.c:2412 [inline]
    collapse_single_pmd+0x85c/0x18d0 mm/khugepaged.c:2447
    madvise_collapse+0x173/0x450 mm/khugepaged.c:2869
    madvise_vma_behavior+0x9ae/0xf80 mm/madvise.c:1364
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1713
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1929
    do_madvise+0x137/0x1c0 mm/madvise.c:2022
    __do_sys_madvise mm/madvise.c:2031 [inline]
    __se_sys_madvise mm/madvise.c:2029 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2029
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810dfb2ff8 (size 576):
  comm "syz.0.25", pid 6149, jiffies 4294944705
  hex dump (first 32 bytes):
    00 06 00 00 00 00 00 00 00 40 a1 10 81 88 ff ff  .........@......
    60 a9 0f 0f 81 88 ff ff 10 30 fb 0d 81 88 ff ff  `........0......
  backtrace (crc 26d7e75d):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    kmem_cache_alloc_lru_noprof+0x377/0x490 mm/slub.c:4917
    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+0x209/0x1b30 mm/khugepaged.c:1916
    collapse_scan_file mm/khugepaged.c:2412 [inline]
    collapse_single_pmd+0x85c/0x18d0 mm/khugepaged.c:2447
    madvise_collapse+0x173/0x450 mm/khugepaged.c:2869
    madvise_vma_behavior+0x9ae/0xf80 mm/madvise.c:1364
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1713
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1929
    do_madvise+0x137/0x1c0 mm/madvise.c:2022
    __do_sys_madvise mm/madvise.c:2031 [inline]
    __se_sys_madvise mm/madvise.c:2029 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2029
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888110a0b918 (size 576):
  comm "syz.0.25", pid 6149, jiffies 4294944705
  hex dump (first 32 bytes):
    00 05 00 00 00 00 00 00 00 40 a1 10 81 88 ff ff  .........@......
    60 a9 0f 0f 81 88 ff ff 30 b9 a0 10 81 88 ff ff  `.......0.......
  backtrace (crc 5e4d6077):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    kmem_cache_alloc_lru_noprof+0x377/0x490 mm/slub.c:4917
    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+0x209/0x1b30 mm/khugepaged.c:1916
    collapse_scan_file mm/khugepaged.c:2412 [inline]
    collapse_single_pmd+0x85c/0x18d0 mm/khugepaged.c:2447
    madvise_collapse+0x173/0x450 mm/khugepaged.c:2869
    madvise_vma_behavior+0x9ae/0xf80 mm/madvise.c:1364
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1713
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1929
    do_madvise+0x137/0x1c0 mm/madvise.c:2022
    __do_sys_madvise mm/madvise.c:2031 [inline]
    __se_sys_madvise mm/madvise.c:2029 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2029
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888100628db0 (size 576):
  comm "syz.0.25", pid 6149, jiffies 4294944705
  hex dump (first 32 bytes):
    00 04 00 00 00 00 00 00 00 40 a1 10 81 88 ff ff  .........@......
    60 a9 0f 0f 81 88 ff ff c8 8d 62 00 81 88 ff ff  `.........b.....
  backtrace (crc fb4fc925):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    kmem_cache_alloc_lru_noprof+0x377/0x490 mm/slub.c:4917
    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+0x209/0x1b30 mm/khugepaged.c:1916
    collapse_scan_file mm/khugepaged.c:2412 [inline]
    collapse_single_pmd+0x85c/0x18d0 mm/khugepaged.c:2447
    madvise_collapse+0x173/0x450 mm/khugepaged.c:2869
    madvise_vma_behavior+0x9ae/0xf80 mm/madvise.c:1364
    madvise_walk_vmas+0x14f/0x510 mm/madvise.c:1713
    madvise_do_behavior+0xc6/0x2c0 mm/madvise.c:1929
    do_madvise+0x137/0x1c0 mm/madvise.c:2022
    __do_sys_madvise mm/madvise.c:2031 [inline]
    __se_sys_madvise mm/madvise.c:2029 [inline]
    __x64_sys_madvise+0x2c/0x40 mm/madvise.c:2029
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

Crashes (40):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/22 05:18 upstream 4ee64205ffaa 0b6ab7ec .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/04/11 17:00 upstream e774d5f1bc27 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/04/11 16:45 upstream e774d5f1bc27 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/03/26 11:08 upstream d2a43e7f89da c6143aac .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/03/09 21:38 upstream 1f318b96cc84 176bead5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
2026/03/03 23:03 upstream af4e9ef3d784 4180d919 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in xas_create
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
2025/12/26 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 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
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
2025/12/23 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
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.