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memory leak in do_timer_create

Status: fixed on 2026/01/07 12:29
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+9c47ad18f978d4394986@syzkaller.appspotmail.com
Fix commit: e0fd4d42e27f posix-timers: Plug potential memory leak in do_timer_create()
First crash: 56d, last: 56d
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH v2] posix-timers: Fix potential memory leak in do_timer_create() 3 (3) 2025/11/14 16:02
[PATCH] posix-timers: Plug a potential memory leak 1 (1) 2025/11/14 13:29
[PATCH] posix-timers: Fix potential memory leak in do_timer_create() 3 (3) 2025/11/14 11:53
[syzbot] [kernel?] memory leak in do_timer_create 0 (4) 2025/11/14 04:17
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/11/14 04:17 29m eslam.medhat1993@gmail.com patch upstream OK log
2025/11/14 03:54 13m eslam.medhat1993@gmail.com patch upstream error
2025/11/14 01:20 35m eslam.medhat1993@gmail.com patch upstream report log

Sample crash report:
2025/11/12 09:47:51 executed programs: 5
BUG: memory leak
unreferenced object 0xffff888108465800 (size 384):
  comm "syz.0.17", pid 6100, jiffies 4294944668
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 1025e73e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    alloc_posix_timer kernel/time/posix-timers.c:429 [inline]
    do_timer_create+0xe0/0x800 kernel/time/posix-timers.c:478
    __do_sys_timer_create kernel/time/posix-timers.c:584 [inline]
    __se_sys_timer_create kernel/time/posix-timers.c:573 [inline]
    __x64_sys_timer_create+0xdb/0xf0 kernel/time/posix-timers.c:573
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881084a0000 (size 384):
  comm "syz.0.18", pid 6104, jiffies 4294944670
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 63c47fd0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    alloc_posix_timer kernel/time/posix-timers.c:429 [inline]
    do_timer_create+0xe0/0x800 kernel/time/posix-timers.c:478
    __do_sys_timer_create kernel/time/posix-timers.c:584 [inline]
    __se_sys_timer_create kernel/time/posix-timers.c:573 [inline]
    __x64_sys_timer_create+0xdb/0xf0 kernel/time/posix-timers.c:573
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881084a0180 (size 384):
  comm "syz.0.19", pid 6107, jiffies 4294944671
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc d769495f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    alloc_posix_timer kernel/time/posix-timers.c:429 [inline]
    do_timer_create+0xe0/0x800 kernel/time/posix-timers.c:478
    __do_sys_timer_create kernel/time/posix-timers.c:584 [inline]
    __se_sys_timer_create kernel/time/posix-timers.c:573 [inline]
    __x64_sys_timer_create+0xdb/0xf0 kernel/time/posix-timers.c:573
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888108464600 (size 384):
  comm "syz.0.20", pid 6127, jiffies 4294945201
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc a3c907e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    alloc_posix_timer kernel/time/posix-timers.c:429 [inline]
    do_timer_create+0xe0/0x800 kernel/time/posix-timers.c:478
    __do_sys_timer_create kernel/time/posix-timers.c:584 [inline]
    __se_sys_timer_create kernel/time/posix-timers.c:573 [inline]
    __x64_sys_timer_create+0xdb/0xf0 kernel/time/posix-timers.c:573
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881084a0300 (size 384):
  comm "syz.0.21", pid 6128, jiffies 4294945201
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc bb0da4da):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    alloc_posix_timer kernel/time/posix-timers.c:429 [inline]
    do_timer_create+0xe0/0x800 kernel/time/posix-timers.c:478
    __do_sys_timer_create kernel/time/posix-timers.c:584 [inline]
    __se_sys_timer_create kernel/time/posix-timers.c:573 [inline]
    __x64_sys_timer_create+0xdb/0xf0 kernel/time/posix-timers.c:573
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/12 09:48 upstream 24172e0d7990 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in do_timer_create
* Struck through repros no longer work on HEAD.