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memory leak in nr_add_node

Status: upstream: reported C repro on 2026/01/15 20:04
Subsystems: hams
[Documentation on labels]
Reported-by: syzbot+3f2d46b6e62b8dd546d3@syzkaller.appspotmail.com
First crash: 43d, last: 29d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [hams?] memory leak in nr_add_node 6 (15) 2026/01/22 17:27
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/01/17 14:27 2h04m activprithvi@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git ea1013c1539270e372fc99854bc6e4d94eaeff66 OK log
2026/01/16 12:51 1h11m kartikey406@gmail.com patch upstream report log
2026/01/16 09:39 21m kartikey406@gmail.com patch upstream report log
2026/01/16 08:59 15m kartikey406@gmail.com patch upstream report log
2026/01/16 08:28 17m kartikey406@gmail.com patch upstream report log
2026/01/16 07:42 19m kartikey406@gmail.com patch upstream error
2026/01/16 03:40 1h07m kartikey406@gmail.com patch upstream report log
2026/01/16 02:19 35m kartikey406@gmail.com patch upstream error
2025/12/31 15:39 1h05m retest repro upstream error
2025/12/31 15:12 1h12m retest repro upstream report log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88811b404b80 (size 64):
  comm "syz.0.17", pid 6071, jiffies 4294944872
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    cc cc cc cc cc cc 02 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc f88ea0ab):
    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]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    nr_add_node+0x5bf/0x14b0 net/netrom/nr_route.c:146
    nr_rt_ioctl+0xc32/0x16e0 net/netrom/nr_route.c:651
    nr_ioctl+0x11f/0x1a0 net/netrom/af_netrom.c:1254
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    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 0xffff88811b404d00 (size 64):
  comm "syz.0.18", pid 6078, jiffies 4294944884
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    cc cc cc cc cc cc 02 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 8f10725b):
    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]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    nr_add_node+0x5bf/0x14b0 net/netrom/nr_route.c:146
    nr_rt_ioctl+0xc32/0x16e0 net/netrom/nr_route.c:651
    nr_ioctl+0x11f/0x1a0 net/netrom/af_netrom.c:1254
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    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 0xffff88811b404f80 (size 64):
  comm "syz.0.19", pid 6086, jiffies 4294944897
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    cc cc cc cc cc cc 02 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 14b53e34):
    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]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    nr_add_node+0x5bf/0x14b0 net/netrom/nr_route.c:146
    nr_rt_ioctl+0xc32/0x16e0 net/netrom/nr_route.c:651
    nr_ioctl+0x11f/0x1a0 net/netrom/af_netrom.c:1254
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    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 (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/17 14:58 upstream ea1013c15392 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-leak memory leak in nr_add_node
* Struck through repros no longer work on HEAD.