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memory leak in hub_event (4)

Status: upstream: reported C repro on 2026/04/25 02:12
Subsystems: usb
[Documentation on labels]
Reported-by: syzbot+2afd7e71155c7e241560@syzkaller.appspotmail.com
First crash: 1d06h, last: 1d06h
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [usb?] memory leak in hub_event (4) 1 (8) 2026/04/26 02:33
[PATCH] ALSA: caiaq: fix usb_dev refcount leak on probe failure 1 (1) 2026/04/26 00:19
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream memory leak in hub_event usb 3 C 7 1893d 1982d 19/29 fixed on 2021/03/10 01:48
upstream memory leak in hub_event (2) usb 3 C 2 1865d 1867d 20/29 fixed on 2021/11/10 00:50
upstream memory leak in hub_event (3) usb 3 C 1 1538d 1534d 0/29 auto-obsoleted due to no activity on 2022/11/04 19:09
▶ ▼ Last patch testing requests (6)
Created Duration User Patch Repo Result
2026/04/25 14:43 39m kartikey406@gmail.com patch upstream OK log
2026/04/25 12:54 8m kartikey406@gmail.com patch upstream error
2026/04/25 09:36 20m souradiptodas6@gmail.com patch upstream report log
2026/04/25 08:58 24m souradiptodas6@gmail.com patch upstream error
2026/04/25 07:52 44m kartikey406@gmail.com patch upstream error
2026/04/25 06:36 36m kartikey406@gmail.com patch upstream report log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff8881277dc000 (size 2048):
  comm "kworker/0:2", pid 1783, jiffies 4294946784
  hex dump (first 32 bytes):
    ff ff ff ff 31 00 00 00 00 00 00 00 00 00 00 00  ....1...........
    00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00  ................
  backtrace (crc 20105372):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5410
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    usb_alloc_dev+0x36/0x4e0 drivers/usb/core/usb.c:651
    hub_port_connect drivers/usb/core/hub.c:5470 [inline]
    hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
    port_event drivers/usb/core/hub.c:5871 [inline]
    hub_event+0x14d0/0x2180 drivers/usb/core/hub.c:5953
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888128b06c00 (size 1024):
  comm "kworker/0:2", pid 1783, jiffies 4294946815
  hex dump (first 32 bytes):
    09 02 49 00 02 01 00 10 40 00 00 00 00 00 00 00  ..I.....@.......
    00 00 00 00 00 00 00 00 89 b8 69 09 81 88 ff ff  ..........i.....
  backtrace (crc b43c3ef8):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    usb_get_configuration+0xeb/0x2110 drivers/usb/core/config.c:940
    usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
    usb_new_device+0x1b4/0x300 drivers/usb/core/hub.c:2665
    hub_port_connect drivers/usb/core/hub.c:5567 [inline]
    hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
    port_event drivers/usb/core/hub.c:5871 [inline]
    hub_event+0x1723/0x2180 drivers/usb/core/hub.c:5953
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff88810c3d5a50 (size 8):
  comm "kworker/0:2", pid 1783, jiffies 4294946815
  hex dump (first 8 bytes):
    80 b8 69 09 81 88 ff ff                          ..i.....
  backtrace (crc 66af3167):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    usb_get_configuration+0x11d/0x2110 drivers/usb/core/config.c:945
    usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
    usb_new_device+0x1b4/0x300 drivers/usb/core/hub.c:2665
    hub_port_connect drivers/usb/core/hub.c:5567 [inline]
    hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
    port_event drivers/usb/core/hub.c:5871 [inline]
    hub_event+0x1723/0x2180 drivers/usb/core/hub.c:5953
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888113c25840 (size 64):
  comm "kworker/0:2", pid 1783, jiffies 4294946817
  hex dump (first 32 bytes):
    01 00 00 00 01 00 00 00 09 04 00 00 00 01 01 30  ...............0
    00 00 00 00 0a 00 00 00 9a b8 69 09 81 88 ff ff  ..........i.....
  backtrace (crc a90fa323):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    usb_parse_configuration drivers/usb/core/config.c:826 [inline]
    usb_get_configuration+0x88f/0x2110 drivers/usb/core/config.c:1002
    usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
    usb_new_device+0x1b4/0x300 drivers/usb/core/hub.c:2665
    hub_port_connect drivers/usb/core/hub.c:5567 [inline]
    hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
    port_event drivers/usb/core/hub.c:5871 [inline]
    hub_event+0x1723/0x2180 drivers/usb/core/hub.c:5953
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff88811d54a500 (size 256):
  comm "kworker/0:2", pid 1783, jiffies 4294946821
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 08 a5 54 1d 81 88 ff ff  ..........T.....
    08 a5 54 1d 81 88 ff ff 20 e7 41 83 ff ff ff ff  ..T..... .A.....
  backtrace (crc 85d09f91):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5410
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    device_private_init drivers/base/core.c:3536 [inline]
    device_add+0x73c/0xc70 drivers/base/core.c:3587
    usb_new_device.cold+0x115/0x626 drivers/usb/core/hub.c:2695
    hub_port_connect drivers/usb/core/hub.c:5567 [inline]
    hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
    port_event drivers/usb/core/hub.c:5871 [inline]
    hub_event+0x1723/0x2180 drivers/usb/core/hub.c:5953
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

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
2026/04/24 22:25 upstream dd6c438c3e64 1c2b9291 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in hub_event
* Struck through repros no longer work on HEAD.