(Sorry for repost, I had asked in qemu-stable, but someone told me that I should send to qemu-devel.)
After I updated my Centos to 7.5.1804, my virtual machine crashed when I connected with vnc password. *1. My problem：* Here what I tested: (1). started a guest with : qemu-system-x86_64 -m 2048 test.img -vnc 0.0.0.0:3 <http://0.0.0.0:7>,password -monitor stdio (2). change password to 1234567. (3). connected with VncViewer Here was the output: # qemu-system-x86_64 -m 2048 test.img -vnc 0.0.0.0:3,password -monitor stdio > QEMU 2.5.1.1 monitor - type 'help' for more information > (qemu) change vnc password 12345678 > (qemu) Segmentation fault > I debugged with gdb and got: > (qemu) change vnc password 12345678 > (qemu) > Program received signal SIGSEGV, Segmentation fault. > 0x00007ffff528cc80 in pthread_mutex_lock () from /lib64/libpthread.so.0 > (gdb) bt > #0 0x00007ffff528cc80 in pthread_mutex_lock () from /lib64/libpthread.so.0 > #1 0x0000555555a97f4a in qemu_mutex_lock (mutex=0x0) at > util/qemu-thread-posix.c:73 > #2 0x0000555555a5cce3 in qcrypto_gcrypt_mutex_lock (priv=0x7ffff6e90ca0) > at crypto/init.c:97 > #3 0x00007ffff6c217c5 in mutex_init () from /lib64/libgcrypt.so.11 > #4 0x00007ffff6c21baa in _gcry_ath_mutex_lock () from > /lib64/libgcrypt.so.11 > #5 0x00007ffff6c5ad20 in lock_pool () from /lib64/libgcrypt.so.11 > #6 0x00007ffff6c5be2e in _gcry_rngcsprng_fast_poll () from > /lib64/libgcrypt.so.11 > #7 0x00007ffff6c23d4d in _gcry_cipher_open () from /lib64/libgcrypt.so.11 > #8 0x0000555555a60251 in qcrypto_cipher_new > (alg=QCRYPTO_CIPHER_ALG_DES_RFB, mode=QCRYPTO_CIPHER_MODE_ECB, > key=0x7fffffffdf30 "12345678\020", nkey=8, errp=0x7fffffffdf08) at > ./crypto/cipher-gcrypt.c:97 > #9 0x00005555559d8912 in protocol_client_auth_vnc (vs=0x5555565b5660, > data=0x555557a6c0a0 "\036\352\"s٘\373\345<ܯ\210L\b;$\220\300\246WUU", > len=16) at ui/vnc.c:2551 > #10 0x00005555559d60b5 in vnc_client_read (opaque=0x5555565b5660) at > ui/vnc.c:1564 > #11 0x0000555555a046a7 in aio_dispatch (ctx=0x555556508790) at > aio-posix.c:326 > #12 0x00005555559f4166 in aio_ctx_dispatch (source=0x555556508790, > callback=0x0, user_data=0x0) at async.c:231 > #13 0x00007ffff5f10969 in g_main_context_dispatch () from > /lib64/libglib-2.0.so.0 > #14 0x0000555555a026e7 in glib_pollfds_poll () at main-loop.c:211 > #15 0x0000555555a027c4 in os_host_main_loop_wait (timeout=54752182) at > main-loop.c:256 > #16 0x0000555555a02874 in main_loop_wait (nonblocking=0) at main-loop.c:504 > #17 0x00005555558251c1 in main_loop () at vl.c:1923 > #18 0x000055555582cbe5 in main (argc=8, argv=0x7fffffffe558, > envp=0x7fffffffe5a0) at vl.c:4699 > *2. Other Infomation* (1). Version of qemu: QEMU emulator version 2.5.1.1, Copyright (c) 2003-2008 Fabrice Bellard (2). kernel and os： kernel : 4.16.3-1.el7.elrepo.x86_64 os: CentOS Linux release 7.5.1804 (Core) (3). I had try /usr/libexec/qemu-kvm(qemu-kvm-1.5.3-156.el7_5.5) and qemu 2.11, both of them worked fine. (4). Has no problem witout vnc password. (5). I update my host with yum update. (6). Everything work find before update. *3. My Question* For some reasons I have to use qemu 2.5.11 and update Centos. (1) What causes this problem and how can I solve it ? Looking forward to your reply. Regards, John
