** Changed in: krb5 (Debian) Status: Unknown => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to krb5 in Ubuntu. https://bugs.launchpad.net/bugs/1225844
Title: applications sometimes get into an infinite busy loop when doing krb5 authentication Status in krb5 package in Ubuntu: Fix Released Status in krb5 package in Debian: Fix Released Bug description: From time to time, kerberos authentication fails for me and the calling application goes into a busy loop, using 100% of CPU. I usually notice this when the fan on my laptop kicks into high gear due to the sudden excessive CPU utilization. I've seen this both with local services using pam_krb5 (lightdm, gnome-screensaver), and with clients to remote services that use libkrb5 directly (openssh-client). Here's a gdb backtrace (with libkrb5-3 debugging symbols) of an ssh client that's stuck this way. The process never leaves service_fds. #0 service_fds (context=context@entry=0x7fd6663a3b00, selstate=selstate@entry=0x7fd6663aabf0, interval=interval@entry=1, conns=conns@entry=0x7fd6663aa5a0, seltemp=seltemp@entry=0x7fd6663acc08, msg_handler=msg_handler@entry=0x7fd6628d6fc0 <check_for_svc_unavailable>, msg_handler_data=msg_handler_data@entry=0x7fff7b237ab8, winner_out=winner_out@entry=0x7fff7b237978) at ../../../../src/lib/krb5/os/sendto_kdc.c:1169 #1 0x00007fd6628d85c1 in k5_sendto (context=context@entry=0x7fd6663a3b00, message=message@entry=0x7fff7b237b40, servers=servers@entry=0x7fff7b237ac0, socktype1=socktype1@entry=2, socktype2=socktype2@entry=1, callback_info=callback_info@entry=0x0, reply=reply@entry=0x7fff7b237b50, remoteaddr=remoteaddr@entry=0x0, remoteaddrlen=remoteaddrlen@entry=0x0, server_used=server_used@entry=0x7fff7b237abc, msg_handler=msg_handler@entry=0x7fd6628d6fc0 <check_for_svc_unavailable>, msg_handler_data=msg_handler_data@entry=0x7fff7b237ab8) at ../../../../src/lib/krb5/os/sendto_kdc.c:1290 #2 0x00007fd6628d89fa in krb5_sendto_kdc ( context=context@entry=0x7fd6663a3b00, message=message@entry=0x7fff7b237b40, realm=realm@entry=0x7fff7b237b60, reply=reply@entry=0x7fff7b237b50, use_master=use_master@entry=0x7fff7b237b3c, tcp_only=tcp_only@entry=0) at ../../../../src/lib/krb5/os/sendto_kdc.c:339 ---Type <return> to continue, or q <return> to quit--- #3 0x00007fd6628b00e5 in krb5_tkt_creds_get ( context=context@entry=0x7fd6663a3b00, ctx=0x7fd6663a8900) at ../../../../src/lib/krb5/krb/get_creds.c:1151 #4 0x00007fd6628b020d in krb5_get_credentials ( context=context@entry=0x7fd6663a3b00, options=options@entry=0, ccache=0x7fd6663a4630, in_creds=in_creds@entry=0x7fff7b237c50, out_creds=out_creds@entry=0x7fff7b237c40) at ../../../../src/lib/krb5/krb/get_creds.c:1229 #5 0x00007fd66336117e in get_credentials ( context=context@entry=0x7fd6663a3b00, cred=cred@entry=0x7fd6663a45b0, now=1379278536, endtime=0, out_creds=out_creds@entry=0x7fff7b237ea0, server=<optimized out>) at ../../../../src/lib/gssapi/krb5/init_sec_context.c:203 #6 0x00007fd6633765aa in kg_new_connection (exts=0x7fff7b237fa0, context=0x7fd6663a3b00, time_rec=0x0, ret_flags=0x0, output_token=0x7fff7b2380e0, actual_mech_type=0x0, input_token=0x0, input_chan_bindings=0x0, time_req=0, req_flags=34, mech_type=<optimized out>, target_name=0x7fd6663a4180, context_handle=0x7fd6663a4060, cred=0x7fd6663a45b0, minor_status=0x7fd6663a19d4) at ../../../../src/lib/gssapi/krb5/init_sec_context.c:619 #7 krb5_gss_init_sec_context_ext (minor_status=0x7fd6663a19d4, claimant_cred_handle=0x7fd6663a45b0, context_handle=0x7fd6663a4060, ---Type <return> to continue, or q <return> to quit--- target_name=0x7fd6663a4180, mech_type=<optimized out>, req_flags=34, time_req=time_req@entry=0, input_chan_bindings=input_chan_bindings@entry=0x0, input_token=input_token@entry=0x0, actual_mech_type=actual_mech_type@entry=0x0, output_token=output_token@entry=0x7fff7b2380e0, ret_flags=ret_flags@entry=0x0, time_rec=time_rec@entry=0x0, exts=exts@entry=0x7fff7b237fa0) at ../../../../src/lib/gssapi/krb5/init_sec_context.c:1009 #8 0x00007fd663376ce1 in krb5_gss_init_sec_context ( minor_status=<optimized out>, claimant_cred_handle=<optimized out>, context_handle=<optimized out>, target_name=<optimized out>, mech_type=<optimized out>, req_flags=<optimized out>, time_req=0, input_chan_bindings=0x0, input_token=0x0, actual_mech_type=0x0, output_token=0x7fff7b2380e0, ret_flags=0x0, time_rec=0x0) at ../../../../src/lib/gssapi/krb5/init_sec_context.c:1117 #9 0x00007fd663368cbd in gss_init_sec_context (minor_status=0x7fd6663a19d4, claimant_cred_handle=0x0, context_handle=0x7fd6663a19d8, target_name=0x7fd6663a2650, req_mech_type=<optimized out>, req_flags=<optimized out>, time_req=0, input_chan_bindings=0x0, input_token=0x0, actual_mech_type=0x0, output_token=0x7fff7b2380e0, ret_flags=0x0, time_rec=0x0) at ../../../../src/lib/gssapi/mechglue/g_init_sec_context.c:211 ---Type <return> to continue, or q <return> to quit--- #10 0x00007fd6644300f0 in ?? () #11 0x00007fd664430355 in ?? () #12 0x00007fd66442f983 in ?? () #13 0x00007fd66442fbe0 in ?? () #14 0x00007fd664407e22 in ?? () #15 0x00007fd664404a52 in ?? () #16 0x00007fd6643f96da in ?? () #17 0x00007fd662fb0de5 in __libc_start_main (main=0x7fd6643f8220, argc=5, ubp_av=0x7fff7b23a8b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff7b23a8a8) at libc-start.c:260 #18 0x00007fd6643fa7f5 in ?? () (gdb) info local e = <optimized out> selret = 1 now = {tv_sec = 1379278539, tv_usec = 792945} state = <optimized out> (gdb) ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: libkrb5-3 1.10.1+dfsg-6.1ubuntu1 ProcVersionSignature: Ubuntu 3.11.0-7.13-generic 3.11.0 Uname: Linux 3.11.0-7-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 Date: Sun Sep 15 19:46:40 2013 InstallationDate: Installed on 2010-09-24 (1087 days ago) InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1) MarkForUpload: True SourcePackage: krb5 UpgradeStatus: Upgraded to saucy on 2013-05-06 (132 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/krb5/+bug/1225844/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp