.
Thread 3 (LWP 1846):
#0  0x00007f7b938c83dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f7b93e076b4 in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (LWP 1845):
#0  0x00007f7b938c83dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f7b93e076b4 in ?? ()
No symbol table info available.
#2  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 1837):
#0  0x00007f7b93811f77 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 1837
        selftid = 1837
#1  0x00007f7b938155e8 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x41aaa1, sa_sigaction = 0x41aaa1}, sa_mask = {__val = {22463632, 140168741516224, 140168777673845, 5, 0, 140733193388032, 140168732220648, 24506480, 140168741516224, 96, 140168777701125, 0, 140168736126832, 0, 0, 140168736126784}}, sa_flags = 0, sa_restorer = 0x20}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f7b93e0e05d in ?? ()
No symbol table info available.
#3  0x000000000156c490 in ?? ()
No symbol table info available.
#4  0x00007f7b93e2b607 in ?? ()
No symbol table info available.
#5  0x00007f7b93e54625 in ?? ()
No symbol table info available.
#6  0x000000000041b660 in ?? ()
No symbol table info available.
#7  0x00007f7b93e54625 in ?? ()
No symbol table info available.
#8  0x00007f7b93e52d04 in ?? ()
No symbol table info available.
#9  0x0000000001805770 in ?? ()
No symbol table info available.
#10 0x0000000000000000 in ?? ()
No symbol table info available.