memory leak in dev_set_name

Status: upstream: reported C repro on 2026/08/10 17:13
Subsystems: kernel
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+87ce68d9f48eca96a84a@syzkaller.appspotmail.com
First crash: 27d, last: 13d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
e4e0dedd assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ memory leak in dev_set_name 2026/08/09 15:49 2026/08/09 15:49 2026/08/09 16:23 5d63f80b
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] memory leak in dev_set_name 1 (3) 2026/08/11 13:32
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/08/23 14:15 29m retest repro upstream report job log log
2026/08/11 04:04 3h09m eadavis@qq.com patch upstream report job log log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88810628f840 (size 16):
  comm "swapper/0", pid 1, jiffies 4294937753
  hex dump (first 16 bytes):
    67 61 64 67 65 74 2e 30 00 00 00 00 00 00 00 00  gadget.0........
  backtrace (crc 5823fe15):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4597 [inline]
    slab_alloc_node mm/slub.c:4917 [inline]
    __do_kmalloc_node mm/slub.c:5333 [inline]
    __kmalloc_node_track_caller_noprof+0x3d3/0x570 mm/slub.c:5471
    kvasprintf+0x6e/0xf0 lib/kasprintf.c:25
    kvasprintf_const+0x5c/0x110 lib/kasprintf.c:49
    kobject_set_name_vargs+0x40/0xd0 lib/kobject.c:274
    dev_set_name+0x6d/0x90 drivers/base/core.c:3560
    usb_add_gadget+0x219/0x330 drivers/usb/gadget/udc/core.c:1459
    usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c:1517 [inline]
    usb_add_gadget_udc+0x6e/0xb0 drivers/usb/gadget/udc/core.c:1564
    dummy_udc_probe+0x26c/0x2e0 drivers/usb/gadget/udc/dummy_hcd.c:1121
    platform_probe+0x86/0xf0 drivers/base/platform.c:1439
    call_driver_probe drivers/base/dd.c:628 [inline]
    really_probe+0x12f/0x3a0 drivers/base/dd.c:706
    __driver_probe_device+0xe9/0x1a0 drivers/base/dd.c:868
    driver_probe_device+0x28/0xf0 drivers/base/dd.c:898
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:1026
    bus_for_each_drv+0xd2/0x130 drivers/base/bus.c:500
    __device_attach+0xf9/0x290 drivers/base/dd.c:1098
    device_initial_probe+0x6f/0x80 drivers/base/dd.c:1153

BUG: memory leak
unreferenced object 0xffff88810629da00 (size 256):
  comm "swapper/0", pid 1, jiffies 4294937753
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 08 da 29 06 81 88 ff ff  ..........).....
    08 da 29 06 81 88 ff ff 80 cd 4e 83 ff ff ff ff  ..).......N.....
  backtrace (crc a134a33e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4597 [inline]
    slab_alloc_node mm/slub.c:4917 [inline]
    __kmalloc_cache_noprof+0x356/0x440 mm/slub.c:5485
    _kmalloc_noprof include/linux/slab.h:988 [inline]
    _kzalloc_noprof include/linux/slab.h:1309 [inline]
    device_private_init drivers/base/core.c:3602 [inline]
    device_add+0x740/0xc80 drivers/base/core.c:3653
    usb_add_gadget+0x221/0x330 drivers/usb/gadget/udc/core.c:1461
    usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c:1517 [inline]
    usb_add_gadget_udc+0x6e/0xb0 drivers/usb/gadget/udc/core.c:1564
    dummy_udc_probe+0x26c/0x2e0 drivers/usb/gadget/udc/dummy_hcd.c:1121
    platform_probe+0x86/0xf0 drivers/base/platform.c:1439
    call_driver_probe drivers/base/dd.c:628 [inline]
    really_probe+0x12f/0x3a0 drivers/base/dd.c:706
    __driver_probe_device+0xe9/0x1a0 drivers/base/dd.c:868
    driver_probe_device+0x28/0xf0 drivers/base/dd.c:898
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:1026
    bus_for_each_drv+0xd2/0x130 drivers/base/bus.c:500
    __device_attach+0xf9/0x290 drivers/base/dd.c:1098
    device_initial_probe+0x6f/0x80 drivers/base/dd.c:1153
    bus_probe_device+0x3e/0xb0 drivers/base/bus.c:620
    device_add+0x99f/0xc80 drivers/base/core.c:3772
    platform_device_add+0x1c2/0x300 drivers/base/platform.c:762

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
2026/08/09 14:15 upstream 06cf61899d64 5d63f80b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in dev_set_name
* Struck through repros no longer work on HEAD.