# gdb -p 20321 /usr/bin/qemu-system-x86_64 GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/bin/qemu-system-x86_64...(no debugging symbols found)...done. Attaching to program: /usr/bin/qemu-system-x86_64, process 20321 [New LWP 20322] [New LWP 20325] [New LWP 20326] [New LWP 20327] [New LWP 20328] [New LWP 20329] [New LWP 20330] [New LWP 20331] [New LWP 20332] [New LWP 20334] warning: .dynamic section for "/usr/lib/x86_64-linux-gnu/librbd.so.1" is not at the expected address (wrong library or version mismatch?) [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007f9b6957fc21 in __GI_ppoll (fds=0x559d5388e080, nfds=10, timeout=, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50 50 ../sysdeps/unix/sysv/linux/ppoll.c: No such file or directory. (gdb) bt #0 0x00007f9b6957fc21 in __GI_ppoll (fds=0x559d5388e080, nfds=10, timeout=, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50 #1 0x0000559d516ec8d9 in qemu_poll_ns () #2 0x0000559d516ec36a in main_loop_wait () #3 0x0000559d5146f2d4 in main () (gdb) info threads Id Target Id Frame * 1 Thread 0x7f9b6e86bc00 (LWP 20321) "qemu-system-x86" 0x00007f9b6957fc21 in __GI_ppoll ( fds=0x559d5388e080, nfds=10, timeout=, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:50 2 Thread 0x7f9b63727700 (LWP 20322) "qemu-system-x86" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38 3 Thread 0x7f9b4933d700 (LWP 20325) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 4 Thread 0x7f9b48b3c700 (LWP 20326) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 5 Thread 0x7f9b3bfff700 (LWP 20327) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 6 Thread 0x7f9b3b7fe700 (LWP 20328) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 7 Thread 0x7f9b3affd700 (LWP 20329) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 8 Thread 0x7f9b3a7fc700 (LWP 20330) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 9 Thread 0x7f9b39ffb700 (LWP 20331) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 10 Thread 0x7f9b397fa700 (LWP 20332) "qemu-system-x86" 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 11 Thread 0x7f979bbff700 (LWP 20334) "qemu-system-x86" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 (gdb) thread 2 [Switching to thread 2 (Thread 0x7f9b63727700 (LWP 20322))] #0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38 38 ../sysdeps/unix/sysv/linux/x86_64/syscall.S: No such file or directory. (gdb) bt #0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38 #1 0x0000559d5175d101 in qemu_event_wait () #2 0x0000559d5176b5be in ?? () #3 0x00007f9b6985570a in start_thread (arg=0x7f9b63727700) at pthread_create.c:333 #4 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 3 [Switching to thread 3 (Thread 0x7f9b4933d700 (LWP 20325))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 ../sysdeps/unix/syscall-template.S: No such file or directory. (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b4933d700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 4 [Switching to thread 4 (Thread 0x7f9b48b3c700 (LWP 20326))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b48b3c700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 5 [Switching to thread 5 (Thread 0x7f9b3bfff700 (LWP 20327))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b3bfff700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 6 [Switching to thread 6 (Thread 0x7f9b3b7fe700 (LWP 20328))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b3b7fe700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 7 [Switching to thread 7 (Thread 0x7f9b3affd700 (LWP 20329))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b3affd700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 8 [Switching to thread 8 (Thread 0x7f9b3a7fc700 (LWP 20330))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b3a7fc700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 9 [Switching to thread 9 (Thread 0x7f9b39ffb700 (LWP 20331))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b39ffb700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 10 [Switching to thread 10 (Thread 0x7f9b397fa700 (LWP 20332))] #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 84 in ../sysdeps/unix/syscall-template.S (gdb) bt #0 0x00007f9b69581357 in ioctl () at ../sysdeps/unix/syscall-template.S:84 #1 0x0000559d514b0e44 in kvm_vcpu_ioctl () #2 0x0000559d514b0efd in kvm_cpu_exec () #3 0x0000559d5149f8d2 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f9b397fa700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) thread 11 [Switching to thread 11 (Thread 0x7f979bbff700 (LWP 20334))] #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 185 ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: No such file or directory. (gdb) bt #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x0000559d5175ce09 in qemu_cond_wait () #2 0x0000559d516dc32b in ?? () #3 0x0000559d516dc848 in ?? () #4 0x00007f9b6985570a in start_thread (arg=0x7f979bbff700) at pthread_create.c:333 #5 0x00007f9b6958b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) cont Continuing.