Hello, syzbot found the following issue on: HEAD commit: 467f8165 Merge tag 'close-range-cloexec-unshare-v5.11' of .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15933e0f500000 kernel config: https://syzkaller.appspot.com/x/.config?x=37c889fb8b2761af dashboard link: https://syzkaller.appspot.com/bug?extid=57281c762a3922e14dfe compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14fe2b9b500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13bd2287500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+57281c762a3922e14dfe@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: memory leak unreferenced object 0xffff88811101c080 (size 64): comm "kworker/0:2", pid 56, jiffies 4294942309 (age 8.240s) 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: [<00000000e42b7c1c>] kmalloc include/linux/slab.h:557 [inline] [<00000000e42b7c1c>] hcd_buffer_alloc+0x149/0x190 drivers/usb/core/buffer.c:134 [<0000000042899d1a>] usb_alloc_coherent+0x42/0x60 drivers/usb/core/usb.c:897 [<00000000abbb04b6>] mcba_usb_start drivers/net/can/usb/mcba_usb.c:644 [inline] [<00000000abbb04b6>] mcba_usb_probe+0x27b/0x430 drivers/net/can/usb/mcba_usb.c:846 [<00000000b5e48b67>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 [<00000000a0416f71>] really_probe+0x159/0x480 drivers/base/dd.c:561 [<00000000cce96f4d>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745 [<00000000b0116c0e>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851 [<00000000da4bf16e>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 [<00000000e826f962>] __device_attach+0x122/0x250 drivers/base/dd.c:919 [<00000000fb35d32b>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 [<0000000083f168a1>] device_add+0x5be/0xc30 drivers/base/core.c:3091 [<000000002b4245b1>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164 [<00000000fa502fa0>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238 [<000000004e1ab3a9>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293 [<00000000a0416f71>] really_probe+0x159/0x480 drivers/base/dd.c:561 [<00000000cce96f4d>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745 BUG: memory leak unreferenced object 0xffff88811101c0c0 (size 64): comm "kworker/0:2", pid 56, jiffies 4294942309 (age 8.240s) 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: [<00000000e42b7c1c>] kmalloc include/linux/slab.h:557 [inline] [<00000000e42b7c1c>] hcd_buffer_alloc+0x149/0x190 drivers/usb/core/buffer.c:134 [<0000000042899d1a>] usb_alloc_coherent+0x42/0x60 drivers/usb/core/usb.c:897 [<00000000abbb04b6>] mcba_usb_start drivers/net/can/usb/mcba_usb.c:644 [inline] [<00000000abbb04b6>] mcba_usb_probe+0x27b/0x430 drivers/net/can/usb/mcba_usb.c:846 [<00000000b5e48b67>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 [<00000000a0416f71>] really_probe+0x159/0x480 drivers/base/dd.c:561 [<00000000cce96f4d>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745 [<00000000b0116c0e>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851 [<00000000da4bf16e>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 [<00000000e826f962>] __device_attach+0x122/0x250 drivers/base/dd.c:919 [<00000000fb35d32b>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 [<0000000083f168a1>] device_add+0x5be/0xc30 drivers/base/core.c:3091 [<000000002b4245b1>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164 [<00000000fa502fa0>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238 [<000000004e1ab3a9>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293 [<00000000a0416f71>] really_probe+0x159/0x480 drivers/base/dd.c:561 [<00000000cce96f4d>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745 BUG: memory leak unreferenced object 0xffff88811101c100 (size 64): comm "kworker/0:2", pid 56, jiffies 4294942309 (age 8.240s) 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: [<00000000e42b7c1c>] kmalloc include/linux/slab.h:557 [inline] [<00000000e42b7c1c>] hcd_buffer_alloc+0x149/0x190 drivers/usb/core/buffer.c:134 [<0000000042899d1a>] usb_alloc_coherent+0x42/0x60 drivers/usb/core/usb.c:897 [<00000000abbb04b6>] mcba_usb_start drivers/net/can/usb/mcba_usb.c:644 [inline] [<00000000abbb04b6>] mcba_usb_probe+0x27b/0x430 drivers/net/can/usb/mcba_usb.c:846 [<00000000b5e48b67>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 [<00000000a0416f71>] really_probe+0x159/0x480 drivers/base/dd.c:561 [<00000000cce96f4d>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745 [<00000000b0116c0e>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851 [<00000000da4bf16e>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 [<00000000e826f962>] __device_attach+0x122/0x250 drivers/base/dd.c:919 [<00000000fb35d32b>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 [<0000000083f168a1>] device_add+0x5be/0xc30 drivers/base/core.c:3091 [<000000002b4245b1>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164 [<00000000fa502fa0>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238 [<000000004e1ab3a9>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293 [<00000000a0416f71>] really_probe+0x159/0x480 drivers/base/dd.c:561 [<00000000cce96f4d>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
