#7252: KDL when removing an active USB network interface --------------------------------------+------------------------- Reporter: phoudoin | Owner: axeld Type: bug | Status: new Priority: critical | Milestone: R1 Component: Network & Internet/Stack | Version: R1/alpha2 Keywords: | Blocked By: Blocking: | Has a Patch: 0 Platform: All | --------------------------------------+------------------------- Plug an USB adapter supported by either usb_asix, usb_ecm or usb_pegasus, with not wire connected. The net_server detect it and starts to configure it via DHCP. Remove it before it fails. You will get this KDL: {{{ PANIC: _mutex_lock(): double lock of 0x8102b9fc by thread 264 Welcome to Kernel Debugging Land... Thread 264 "/dev/net/pegasus/0 reader" running on CPU 1 stack trace for thread 264 "/dev/net/pegasus/0 reader" kernel stack: 0x816b5000 to 0x816b9000 frame caller <image>:function + offset 0 816b8bcc (+ 32) 800ed4b3 <kernel_x86>:arch_debug_stack_trace + 0x000f 1 816b8bec (+ 16) 80072d1e <kernel_x86> stack_trace_trampoline(void*: NULL) + 0x000b 2 816b8bfc (+ 12) 800f2c96 <kernel_x86>:arch_debug_call_with_fault_handler + 0x001b 3 816b8c08 (+ 48) 80073215 <kernel_x86>:debug_call_with_fault_handler + 0x0052 4 816b8c38 (+ 80) 800741c6 <kernel_x86> kernel_debugger_loop(char const*: 0x1 "<???>", char const*: 0x8015b764 "^^k^", char*: 0x816b8cc8, int32: -2147007438) + 0x0226 5 816b8c88 (+ 64) 80074451 <kernel_x86> kernel_debugger_internal(char const*: 0x1 "<???>", char const*: 0x860446b0 "", char*: 0x816b8ce8, int32: -2147006943) + 0x0112 6 816b8cc8 (+ 32) 80074634 <kernel_x86>:panic + 0x0023 7 816b8ce8 (+ 80) 8006cbd5 <kernel_x86>:_mutex_lock + 0x00a7 8 816b8d38 (+ 512) 8101705f </boot/system/add-ons/kernel/network/stack> get_device_interface(const char*: 0x85b6d9ac "/dev/net/pegasus/0", false) + 0x002f 9 816b8f38 (+ 64) 81017c86 </boot/system/add-ons/kernel/network/stack> device_removed(net_device*: 0x85b6d9a8) + 0x0036 10 816b8f78 (+ 96) 81017e0e </boot/system/add-ons/kernel/network/stack> device_reader_thread(void*: 0x8638b968) + 0x010e 11 816b8fd8 (+ 32) 800065d0b <kernel_x86> _create_kernel_thread_kentry() + 0x0015 12 816b8ff8 (+2123657224) 800069578 <kernel_x86> thread_kthread_exit() + 0x0000 }}} This is under gcc4hybrid r40220 native system. When the device is removed after the DHCP failed attemps, there is no KDL, but running ifconfig or clicking networkstatus replicant in Deskbar froze them. One also can wonder why the pegasus device report a link when there is none yet... -- Ticket URL: <http://dev.haiku-os.org/ticket/7252> Haiku <http://dev.haiku-os.org> Haiku - the operating system.