Hello, syzbot found the following issue on: HEAD commit: 4d02da97 Merge tag 'net-5.10-rc5' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13a7d2b6500000 kernel config: https://syzkaller.appspot.com/x/.config?x=c5353ac514ca5a43 dashboard link: https://syzkaller.appspot.com/bug?extid=44e64397bd81d5e84cba compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14925089500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16810051500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+44e64397bd81d5e84cba@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: memory leak unreferenced object 0xffff88810d5ff800 (size 2048): comm "kworker/1:0", pid 17, jiffies 4294949188 (age 14.280s) 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 03 00 00 00 ................ backtrace: [<00000000f0428224>] kmalloc include/linux/slab.h:552 [inline] [<00000000f0428224>] kzalloc include/linux/slab.h:664 [inline] [<00000000f0428224>] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582 [<000000001802b3dd>] hub_port_connect drivers/usb/core/hub.c:5128 [inline] [<000000001802b3dd>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] [<000000001802b3dd>] port_event drivers/usb/core/hub.c:5508 [inline] [<000000001802b3dd>] hub_event+0x118d/0x20d0 drivers/usb/core/hub.c:5590 [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272 [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418 [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 BUG: memory leak unreferenced object 0xffff888112544c40 (size 32): comm "kworker/1:0", pid 17, jiffies 4294949188 (age 14.280s) hex dump (first 32 bytes): 31 2d 31 00 00 00 00 00 00 00 00 00 00 00 00 00 1-1............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000d0f4aa93>] kvasprintf+0x6c/0xf0 lib/kasprintf.c:25 [<000000005866b3ad>] kvasprintf_const+0x58/0x110 lib/kasprintf.c:49 [<00000000b590b008>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289 [<00000000d251a578>] dev_set_name+0x63/0x90 drivers/base/core.c:2722 [<0000000075b37c03>] usb_alloc_dev+0x1ee/0x450 drivers/usb/core/usb.c:650 [<000000001802b3dd>] hub_port_connect drivers/usb/core/hub.c:5128 [inline] [<000000001802b3dd>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] [<000000001802b3dd>] port_event drivers/usb/core/hub.c:5508 [inline] [<000000001802b3dd>] hub_event+0x118d/0x20d0 drivers/usb/core/hub.c:5590 [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272 [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418 [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 BUG: memory leak unreferenced object 0xffff888112544ce0 (size 32): comm "kworker/1:0", pid 17, jiffies 4294949231 (age 13.850s) hex dump (first 32 bytes): 00 4d 54 12 81 88 ff ff 00 00 00 00 00 00 00 00 .MT............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000005516ca37>] kmalloc include/linux/slab.h:557 [inline] [<000000005516ca37>] kzalloc include/linux/slab.h:664 [inline] [<000000005516ca37>] usb_get_configuration+0xce/0x1dd0 drivers/usb/core/config.c:887 [<000000009ab33a39>] usb_enumerate_device drivers/usb/core/hub.c:2387 [inline] [<000000009ab33a39>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2523 [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline] [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline] [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590 [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272 [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418 [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 BUG: memory leak unreferenced object 0xffff888112544bc0 (size 32): comm "kworker/1:0", pid 17, jiffies 4294949247 (age 13.690s) hex dump (first 32 bytes): 73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 syz............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b344f779>] kmalloc include/linux/slab.h:557 [inline] [<00000000b344f779>] usb_cache_string+0x8a/0xf0 drivers/usb/core/message.c:1025 [<0000000074577e65>] usb_enumerate_device drivers/usb/core/hub.c:2397 [inline] [<0000000074577e65>] usb_new_device+0x98/0x2e0 drivers/usb/core/hub.c:2523 [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline] [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline] [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590 [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272 [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418 [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 BUG: memory leak unreferenced object 0xffff888112544cc0 (size 32): comm "kworker/1:0", pid 17, jiffies 4294949251 (age 13.650s) hex dump (first 32 bytes): 73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 syz............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b344f779>] kmalloc include/linux/slab.h:557 [inline] [<00000000b344f779>] usb_cache_string+0x8a/0xf0 drivers/usb/core/message.c:1025 [<000000003d5bd90b>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline] [<000000003d5bd90b>] usb_new_device+0xae/0x2e0 drivers/usb/core/hub.c:2523 [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline] [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline] [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590 [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272 [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418 [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 BUG: memory leak unreferenced object 0xffff888112544d40 (size 32): comm "kworker/1:0", pid 17, jiffies 4294949255 (age 13.610s) hex dump (first 32 bytes): 73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 syz............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000b344f779>] kmalloc include/linux/slab.h:557 [inline] [<00000000b344f779>] usb_cache_string+0x8a/0xf0 drivers/usb/core/message.c:1025 [<000000007392d5f6>] usb_enumerate_device drivers/usb/core/hub.c:2400 [inline] [<000000007392d5f6>] usb_new_device+0xc4/0x2e0 drivers/usb/core/hub.c:2523 [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline] [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline] [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590 [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272 [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418 [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292 [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory --- This report is generated 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