--- thread stack trace --- . Thread 6 (process 21533): #0 0xffffe410 in __kernel_vsyscall () #1 0xb75d5803 in ?? () #2 0x00000000 in ?? () . Thread 5 (process 21534): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7e07a8c in ?? () #2 0x00000000 in ?? () . Thread 4 (process 21554): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7e07a8c in ?? () #2 0x00000000 in ?? () . Thread 3 (process 21612): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7e07a8c in ?? () #2 0x00000000 in ?? () . Thread 2 (process 21655): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7e07a8c in ?? () #2 0x00000000 in ?? () . Thread 1 (process 21532): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7e0b651 in ?? () #2 0x0805c154 in _DYNAMIC () #3 0x0000000b in ?? () #4 0xbfb71f68 in ?? () #5 0x080583b6 in nsProfileLock::LockWithFcntl (this=0xb, lockFilePath=@0xbfb71edc) at ../../../dist/include/string/nsTPromiseFlatString.h:127 rv = #6 0x080583b6 in nsProfileLock::LockWithFcntl (this=0xb, lockFilePath=@0x33) at ../../../dist/include/string/nsTPromiseFlatString.h:127 rv = #7 #8 0xb52567c0 in ?? () #9 0x08a08d30 in ?? () #10 0x00000021 in ?? () #11 0x0810f3b8 in ?? () #12 0xbfb7227c in ?? () #13 0xb7e3c34e in ?? () #14 0xb7413b20 in ?? () #15 0xbfb72278 in ?? () #16 0xbfb7227c in ?? () #17 0xb7e3bbf0 in ?? () #18 0xb7f991a0 in ?? () #19 0x08ac6344 in ?? () #20 0xb68eabd4 in ?? () #21 0x08a08cf0 in ?? () #22 0xbfb72430 in ?? () #23 0xbfb722b8 in ?? () #24 0xb52505ad in ?? () #25 0x08a08cf0 in ?? () #26 0x00000021 in ?? () #27 0xbfb72430 in ?? () #28 0x00000000 in ?? ()