id summary reporter owner description type status priority milestone component version resolution keywords cc blockedby blocking platform 2388 deadlock between kernel heap and kernel vm korli mmlr "The heap grower thread is trying to acquire the kernel aspace lock. The net_server thread is trying to use memalign() which waits for the heap grower, while holding the kernel aspace lock. Here is the dump of the debug session: {{{ kdebug> bt 8 stack trace for thread 8 ""heap grower"" kernel stack: 0x80147000 to 0x8014b000 frame caller :function + offset 8014ad88 (+ 32) 80037d1e :context_switch__FP6threadT0 + 0x0026 8014ada8 (+ 64) 80037f88 :scheduler_reschedule + 0x0248 8014ade8 (+ 64) 80039270 :switch_sem_etc + 0x0368 8014ae28 (+ 64) 80038eda :acquire_sem_etc + 0x0026 8014ae68 (+ 64) 8009154e :SetTo__23AddressSpaceWriteLockerl + 0x0036 8014aea8 (+ 144) 80092d81 :vm_create_anonymous_area + 0x00c1 8014af38 (+ 96) 80098a7f :create_area + 0x0047 8014af98 (+ 64) 8002f964 :heap_grow_thread__FPv + 0x0060 8014afd8 (+ 32) 80042993 :_create_kernel_thread_kentry__Fv + 0x001b 8014aff8 (+2146127880) 80042928 :thread_kthread_exit__Fv + 0x0000 kdebug> kdebug> bt 76 stack trace for thread 76 ""net_server"" kernel stack: 0x80250000 to 0x80254000 user stack: 0x7efe7000 to 0x7ffe7000 frame caller :function + offset 802537d4 (+ 32) 80037d1e :context_switch__FP6threadT0 + 0x0026 802537f4 (+ 64) 80037f88 :scheduler_reschedule + 0x0248 80253834 (+ 64) 80039270 :switch_sem_etc + 0x0368 80253874 (+ 48) 80038f02 :switch_sem + 0x001e 802538a4 (+ 48) 8002fc56 :memalign + 0x00d6 802538d4 (+ 32) 8002fcac :malloc + 0x0014 802538f4 (+ 48) 80091f4f :create_area_struct__FP16vm_address_spacePCcUlUl + 0x002f 80253924 (+ 64) 8009288d :map_backing_store__FP16vm_address_spaceP8vm_cachePPvxUlUliiiPP7vm_areaPCcbT11_ + 0x0021 80253964 (+ 176) 80092edf :vm_create_anonymous_area + 0x021f 80253a14 (+ 96) 80098a7f :create_area + 0x0047 80253a74 (+ 80) 80678365 :__23PhysicalMemoryAllocatorPCcUlUlUl + 0x0161 80253ac4 (+ 80) 80674496 :__5Stack + 0x00b2 80253b14 (+ 48) 80673640 :bus_std_ops__Fle + 0x00a8 80253b44 (+ 64) 8003405b :get_module + 0x013f 80253b84 (+ 48) 802c48da :init_driver + 0x002a 80253bb4 (+ 48) 8005a229 :load_driver__FP13legacy_driver + 0x0139 80253be4 (+ 128) 8005a6e1 :add_driver__FPCcl + 0x022d 80253c64 (+ 32) 8005c2b0 :legacy_driver_add + 0x0014 80253c84 (+ 48) 8005b994 :try_drivers__FRt16DoublyLinkedList2Z12driver_entryZt31DoublyLinkedListStandardGetLink1Z12driver_entry + 0x00a4 80253cb4 (+ 192) 8005bde3 :probe_for_drivers__FPCc + 0x03ff 80253d74 (+ 144) 8005c75e :legacy_driver_probe + 0x0172 80253e04 (+ 96) 800565fd :scan_for_drivers__FP11devfs_vnode + 0x0085 80253e64 (+ 64) 80058135 :devfs_open_dir__FP9fs_volumeP8fs_vnodePPv + 0x0081 80253ea4 (+ 48) 8007c3d2 :open_dir_vnode__FP5vnodeb + 0x0022 80253ed4 (+ 48) 8007ccbd :dir_open__FiPcb + 0x0051 80253f04 (+ 64) 80081a6b :_user_open_dir + 0x0093 80253f44 (+ 100) 800a47e2 :pre_syscall_debug_done + 0x0002 (nearest) iframe at 0x80253fa8 (end = 0x80254000) eax 0x5a ebx 0x444a28 ecx 0x7ffe6720 edx 0xffff0104 esi 0x214107 edi 0x7ffe6948 ebp 0x7ffe674c esp 0x80253fdc eip 0xffff0104 eflags 0x203 vector: 0x63, error code: 0x0 80253fa8 (+ 0) ffff0104 7ffe674c (+ 48) 00382c19 :__10BDirectoryPCc + 0x0055 7ffe677c (+ 544) 0020b988 <_APP_>:_ConfigureDevices__9NetServeriPCcP8BMessage + 0x0028 7ffe699c (+ 272) 0020c02d <_APP_>:_BringUpInterfaces__9NetServer + 0x0211 7ffe6aac (+ 80) 00209a7a <_APP_>:ReadyToRun__9NetServer + 0x005e 7ffe6afc (+ 496) 002bd309 :DispatchMessage__12BApplicationP8BMessageP8BHandler + 0x02f9 7ffe6cec (+ 64) 002c791d :task_looper__7BLooper + 0x0211 7ffe6d2c (+ 64) 002bbb81 :Run__12BApplication + 0x0075 7ffe6d6c (+ 528) 0020c2df <_APP_>:main + 0x0083 7ffe6f7c (+ 48) 00209267 <_APP_>:_start + 0x005b 7ffe6fac (+ 48) 0010084a 3991:runtime_loader_seg0ro@0x00100000 + 0x84a 7ffe6fdc (+ 0) 7ffe6fec 3990:net_server_main_stack@0x7efe7000 + 0xffffec kdebug> kdebug> sem 5 SEM: 0x9209b104 id: 5 (0x5) name: 'heap_grown_notify' owner: 0 count: -1 queue: 76 last acquired by: 0, count: 0 last released by: 0, count: 0 kdebug> kdebug> sem 1 SEM: 0x9209b034 id: 1 (0x1) name: 'kernel_aspacelock' owner: 0 count: -1025 queue: 8 77 last acquired by: 76, count: 1024 last released by: 77, count: 1 kdebug> kdebug> kdebug> threads thread id state wait for object cpu pri stack team name 0x800e64e0 1 running - 0 0 0x80201000 1 idle thread 1 0x90b4d000 2 waiting cvar 0x800e64c8 - 15 0x800ff000 1 undertaker 0x90b4d800 3 zzz - 5 0x80133000 1 kernel daemon 0x90b4e000 4 zzz - 1 0x80137000 1 page scrubber 0x90b4e800 5 waiting sem 18 - 11 0x8013b000 1 page writer 0x919ed800 68 waiting sem 671 - 10 0x80150000 68 _roster_thread_ 0x90b4f000 6 waiting sem 22 - 10 0x8013f000 1 page daemon 0x90b4f800 7 waiting sem 26 - 5 0x80143000 1 low memory handler 0x919fb000 70 zzz - 10 0x801fa000 68 message deliverer 0x90b50000 8 waiting sem 1 - 110 0x80147000 1 heap grower 0x919fb800 71 waiting sem 678 - 10 0x8023c000 68 timer_thread 0x90b61000 9 waiting mutex 0x90b2a38c - 5 0x8014c000 1 block notifier/writer 0x90b6f000 72 waiting sem 682 - 10 0x80240000 68 authentication manager 0x90b6f800 73 waiting sem 695 - 10 0x80244000 68 main_mime 0x90b66000 11 waiting sem 41 - 10 0x80154000 1 acpi_task 0x91a07000 74 waiting sem 706 - 15 0x80248000 68 messaging command processor 0x90b61800 75 waiting sem 784 - 10 0x801f6000 75 debug_server 0x91a0d800 76 waiting sem 5 - 10 0x80250000 76 net_server 0x91a14000 77 waiting sem 1 - 10 0x80254000 77 app_server 0x91a1f000 78 zzz - 10 0x80258000 78 waitfor 0x90b6b000 48 zzz - 10 0x8015a000 1 media checker 0x91a32000 80 waiting sem 817 - 10 0x80260000 75 kernel listener 0x91a29800 82 waiting sem 834 - 10 0x8025c000 76 PathMonitor looper 0x91a32800 83 waiting sem 841 - 10 0x80264000 76 PathMonitor looper 0x91a41800 84 waiting sem 870 - 10 0x8027e000 1 net timer 0x91a69800 85 waiting sem 915 - 15 0x802ba000 1 loop consumer 0x90b6b800 54 waiting sem 225 - 10 0x80162000 1 locked_pool_enlarger 0x90b66800 55 waiting sem 233 - 20 0x80166000 1 scsi_bus_service 0x90ba8000 56 waiting sem 267 - 20 0x8016f000 1 scsi_bus_service 0x90ba8800 58 waiting sem 476 - 5 0x801ec000 1 syslog sender 0x919ec000 59 waiting cvar 0x90c6ded8 - 10 0x801f0000 59 sh kdebug> }}} " bug closed normal R1 System/Kernel R1/pre-alpha1 fixed All