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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1606:b0:433:30e0:6f68 with SMTP id e9e14a558f8ab-43473dcf8ebmr59135945ab.24.1763007988927; Wed, 12 Nov 2025 20:26:28 -0800 (PST) Date: Wed, 12 Nov 2025 20:26:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69155df4.a70a0220.3124cb.0017.GAE@google.com> Subject: [syzbot] [kernel?] memory leak in do_timer_create From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 24172e0d7990 Merge tag 'arm64-fixes' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=165417cd980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cb128cd5cb439809 dashboard link: https://syzkaller.appspot.com/bug?extid=9c47ad18f978d4394986 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15004914580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ea6b42580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ded911fa4408/disk-24172e0d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a1f3e61cb784/vmlinux-24172e0d.xz kernel image: https://storage.googleapis.com/syzbot-assets/b92fd0e25cb7/bzImage-24172e0d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9c47ad18f978d4394986@syzkaller.appspotmail.com 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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup