Asterisk dies (in modules codec_lpc10.so) with the following backtrace (running on an Atom CPU) because glibc tries to use roundsd which is SSE4.1, the latter not being present on Atom... I initially reported this in bug 801650 as it seemed related. Using host libthread_db library "/lib64/libthread_db.so.1". Core was generated by `/usr/sbin/asterisk -f -C /etc/asterisk/asterisk.conf'. Program terminated with signal 4, Illegal instruction. #0 floor (__x=<optimized out>) at /usr/include/bits/mathinline.h:218 218 __asm ("roundsd $1, %1, %0" : "=x" (__res) : "xm" (__x)); Thread 29 (Thread 0x7f0666121700 (LWP 26507)): #0 strchrnul () at ../sysdeps/x86_64/strchrnul.S:34 No locals. #1 0x00007f06975b42df in __find_specmb (format=0x7f064d988e00 "Got 423 Interval too brief for service %s@%s, minimum is %d seconds\n") at printf-parse.h:99 No locals. #2 _IO_vfprintf_internal (s=s@entry=0x7f066611ec40, format=format@entry=0x7f064d988e00 "Got 423 Interval too brief for service %s@%s, minimum is %d seconds\n", ap=ap@entry=0x7f066611ee08) at vfprintf.c:1277 thousands_sep = 0x0 grouping = 0xffffffffffffffff <Address 0xffffffffffffffff out of bounds> done = 0 f = <optimized out> lead_str_end = <optimized out> end_of_spec = <optimized out> work_buffer = '\000' <repeats 999 times> workstart = 0x0 workend = <optimized out> ap_save = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7f066611f110, reg_save_area = 0x7f066611f020}} nspecs_done = 0 save_errno = 0 readonly_format = 0 args_malloced = 0x0 jump_table = "\001\000\000\004\000\016\000\006\000\000\a\002\000\003\t\000\005\b\b\b\b\b\b\b\b\b\000\000\000\000\000\000\000\032\000\031\000\023\023\023\000\035\000\000\f\000\000\000\000\000\000\025\000\000\000\000\022\000\r\000\000\000\000\000\000\032\000\024\017\023\023\023\n\017\034\000\v\030\027\021\026\f\000\025\033\020\000\000\022\000\r" #3 0x00007f0697674ff0 in ___vsnprintf_chk (s=0x7f063c017ca8 "", maxlen=<optimized out>, flags=flags@entry=1, slen=slen@entry=18446744073709551615, format=format@entry=0x7f064d988e00 "Got 423 Interval too brief for service %s@%s, minimum is %d seconds\n", args=args@entry=0x7f066611ee08) at vsnprintf_chk.c:65 sf = {f = {_sbf = {_f = {_flags = -72515583, _IO_read_ptr = 0x7f063c017ca8 "", _IO_read_end = 0x7f063c017ca8 "", _IO_read_base = 0x7f063c017ca8 "", _IO_write_base = 0x7f063c017ca8 "", _IO_write_ptr = 0x7f063c017ca8 "", _IO_write_end = 0x7f063c017da7 "", _IO_buf_base = 0x7f063c017ca8 "", _IO_buf_end = 0x7f063c017da7 "", _IO_save_base = 0x0, _IO_backup_base = 0x0, _IO_save_end = 0x0, _markers = 0x0, _chain = 0x0, _fileno = 0, _flags2 = 4, _old_offset = 0, _cur_column = 0, _vtable_offset = 0 '\000', _shortbuf = "", _lock = 0x0, _offset = 0, _codecvt = 0x0, _wide_data = 0x0, _freeres_list = 0x0, _freeres_buf = 0x0, _freeres_size = 0, _mode = -1, _unused2 = '\000' <repeats 19 times>}, vtable = 0x7f069791d420}, _s = {_allocate_buffer = 0, _free_buffer = 0}}, overflow_buf = '\000' <repeats 56 times>"\300, \355\021f\006\177\000"} ret = <optimized out> [...] Dump of assembler code for function i_nint: 0x00007f0658765c90 <+0>: movss (%rdi),%xmm0 0x00007f0658765c94 <+4>: ucomiss 0x14c9(%rip),%xmm0 # 0x7f0658767164 0x00007f0658765c9b <+11>: unpcklps %xmm0,%xmm0 0x00007f0658765c9e <+14>: jb 0x7f0658765cc0 <i_nint+48> 0x00007f0658765ca0 <+16>: cvtps2pd %xmm0,%xmm0 0x00007f0658765ca3 <+19>: addsd 0x14e5(%rip),%xmm0 # 0x7f0658767190 => 0x00007f0658765cab <+27>: roundsd $0x1,%xmm0,%xmm0 0x00007f0658765cb1 <+33>: cvttsd2si %xmm0,%eax 0x00007f0658765cb5 <+37>: retq Version-Release number of selected component (if applicable): glibc-2.15-35.fc17.x86_64 How reproducible: Always Steps to Reproduce: 1. install asterisk 2. start it 3. watch it die Actual results: Dies with SIGILL Expected results: glibc shouldn't be using instructions not supported on a given CPU
This is an asterisk problem. i_nint is a function within asterisk which calls _floor (f2clib.c): #ifdef KR_headers double floor(); integer i_nint(x) real *x; #else #undef abs #include "math.h" integer i_nint(real *x) #endif { return( (integer)((*x)>=0 ? floor(*x + .5) : -floor(.5 - *x)) ); } The inlined definition of floor from glibc which uses roundsd is protected with: # if defined __SSE4_1__ && (__WORDSIZE == 64 || defined __SSE2_MATH__) # if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99 So from this we can conclude that asterisk's f2clib.c was compiled and either __SSE4_1__ or__SSE2_MATH_ was defined. glibc is doing exactly what it was asked to to -- use the SSE 4.1 ISA. Reassigning to asterisk.
I got hit by this, too. Rebuilding the RPMs locally fixed this - apparently Asterisk build process is using optimizations specific to the build CPU.
Created attachment 585448 [details] Output of /proc/cpuinfo
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