syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1331]
≡ Subsystems
🐞 Fixed [7147]
🐞 Invalid [18896]
⬇ Missing Backports [220]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

memory leak in ldisc_receive

Status: upstream: reported C repro on 2026/01/17 17:34
Subsystems: net usb
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+f9d847b2b84164fa69f3@syzkaller.appspotmail.com
First crash: 147d, last: 62d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
bef7d78e-b9ba-4162-9920-f533f5158999 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ memory leak in ldisc_receive 2026/05/17 23:08 2026/05/17 23:08 2026/05/17 23:17 de5aae85e5f28e2fa1c7deefcc24fe286abe5140
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH v2] net: caif: fix memory leak in ldisc_receive 6 (6) 2026/01/24 19:10
[PATCH] net: caif: fix memory leak in ldisc_receive 3 (3) 2026/01/18 17:35
[syzbot] [net?] [input?] [usb?] memory leak in ldisc_receive 0 (1) 2026/01/17 17:34
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/05/26 20:46 2h47m retest repro upstream OK log
2026/04/07 23:36 1h31m retest repro upstream report log
2026/04/07 23:16 1h43m retest repro upstream report log
2026/03/17 12:25 12m retest repro upstream report log
2026/03/17 12:14 12m retest repro upstream report log
2026/01/27 17:26 5h31m retest repro upstream report log
2026/01/27 17:24 5h24m retest repro upstream report log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff888109d88b00 (size 240):
  comm "syz.0.17", pid 6088, jiffies 4294942822
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 20 8e 13 81 88 ff ff 00 00 00 00 00 00 00 00  . ..............
  backtrace (crc cd2b8445):
    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]
    kmem_cache_alloc_node_noprof+0x384/0x5a0 mm/slub.c:5315
    __alloc_skb+0xe8/0x2b0 net/core/skbuff.c:679
    __netdev_alloc_skb+0x72/0x230 net/core/skbuff.c:754
    netdev_alloc_skb include/linux/skbuff.h:3484 [inline]
    ldisc_receive+0x7d/0x210 drivers/net/caif/caif_serial.c:176
    tiocsti drivers/tty/tty_io.c:2290 [inline]
    tty_ioctl+0x329/0xd40 drivers/tty/tty_io.c:2706
    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 0xffff88810a368500 (size 240):
  comm "syz.0.18", pid 6193, jiffies 4294942941
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 20 94 13 81 88 ff ff 00 00 00 00 00 00 00 00  . ..............
  backtrace (crc 5d1300cb):
    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]
    kmem_cache_alloc_node_noprof+0x384/0x5a0 mm/slub.c:5315
    __alloc_skb+0xe8/0x2b0 net/core/skbuff.c:679
    __netdev_alloc_skb+0x72/0x230 net/core/skbuff.c:754
    netdev_alloc_skb include/linux/skbuff.h:3484 [inline]
    ldisc_receive+0x7d/0x210 drivers/net/caif/caif_serial.c:176
    tiocsti drivers/tty/tty_io.c:2290 [inline]
    tty_ioctl+0x329/0xd40 drivers/tty/tty_io.c:2706
    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 0xffff88810a9e2c00 (size 704):
  comm "syz.0.18", pid 6193, jiffies 4294942941
  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 b6200c):
    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]
    kmem_cache_alloc_node_noprof+0x384/0x5a0 mm/slub.c:5315
    kmalloc_reserve+0xe6/0x180 net/core/skbuff.c:586
    __alloc_skb+0x111/0x2b0 net/core/skbuff.c:690
    __netdev_alloc_skb+0x72/0x230 net/core/skbuff.c:754
    netdev_alloc_skb include/linux/skbuff.h:3484 [inline]
    ldisc_receive+0x7d/0x210 drivers/net/caif/caif_serial.c:176
    tiocsti drivers/tty/tty_io.c:2290 [inline]
    tty_ioctl+0x329/0xd40 drivers/tty/tty_io.c:2706
    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 0xffff888109ddda00 (size 240):
  comm "syz.0.19", pid 6262, jiffies 4294943059
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 50 8e 13 81 88 ff ff 00 00 00 00 00 00 00 00  .P..............
  backtrace (crc 3f6ba7c1):
    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]
    kmem_cache_alloc_node_noprof+0x384/0x5a0 mm/slub.c:5315
    __alloc_skb+0xe8/0x2b0 net/core/skbuff.c:679
    __netdev_alloc_skb+0x72/0x230 net/core/skbuff.c:754
    netdev_alloc_skb include/linux/skbuff.h:3484 [inline]
    ldisc_receive+0x7d/0x210 drivers/net/caif/caif_serial.c:176
    tiocsti drivers/tty/tty_io.c:2290 [inline]
    tty_ioctl+0x329/0xd40 drivers/tty/tty_io.c:2706
    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 (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/13 17:23 upstream b71e635feefc d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in ldisc_receive
2026/03/03 10:31 upstream af4e9ef3d784 28b83e23 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in ldisc_receive
* Struck through repros no longer work on HEAD.