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Previously, the Cockpit web interface terminated unexpectedly in some cases with a "the session has crashed" error message. This update fixes a race condition with the fslist channels, and the crash no longer occurs.
Description of problem: Cockpit's fslist1 channel is being used in many cockpit pages, such as Docker, file autocompletion in the "SSH key" dialog or "Create new VM" on Machines.
This code has a race condition, which is caught by the upstream test/verify/check-authorize test. If it fails, the bridge crashes with
Oct 09 13:54:05 m1 systemd-coredump[1652]: Process 1564 (cockpit-bridge) of user 1000 dumped core.
Stack trace of thread 1564:
#0 0x00007fcbf8928855 _g_log_abort (libglib-2.0.so.0)
#1 0x00007fcbf8929b8d g_logv (libglib-2.0.so.0)
#2 0x00007fcbf8929d63 g_log (libglib-2.0.so.0)
#3 0x000055b0a990546a cockpit_channel_control (cockpit-bridge)
#4 0x000055b0a98e4465 on_files_listed (cockpit-bridge)
#5 0x00007fcbf8e95d9f next_async_callback_wrapper (libgio-2.0.so.0)
#6 0x00007fcbf8ecfe04 g_task_return_now (libgio-2.0.so.0)
#7 0x00007fcbf8ecfe3d complete_in_idle_cb (libgio-2.0.so.0)
#8 0x00007fcbf891f1cb g_idle_dispatch (libglib-2.0.so.0)
#9 0x00007fcbf892288d g_main_context_dispatch (libglib-2.0.so.0)
#10 0x00007fcbf8922c58 g_main_context_iterate.isra.21 (libglib-2.0.so.0)
#11 0x00007fcbf8922cf0 g_main_context_iteration (libglib-2.0.so.0)
#12 0x000055b0a98de06c main (cockpit-bridge)
#13 0x00007fcbf782a11b __libc_start_main (libc.so.6)
#14 0x000055b0a98dec4a _start (cockpit-bridge)
which for the user results in a spontaneous disconnect of their session:
https://fedorapeople.org/groups/cockpit/logs/pull-10252-20181009-132929-35c774e7-verify-fedora-atomic/TestReauthorize-testBasic-fedora-atomic-127.0.0.2-2301-FAIL.png
This got fixed upstream in https://github.com/cockpit-project/cockpit/commit/9cde72ba36102 , and this would be good to backport to RHEL 7.
Version-Release number of selected component (if applicable):
cockpit-173-7.el7
How reproducible: Difficult. It happened pretty often in our upstream CI, due to the sheer mass of test runs that we do. Since the fix, it has never crashed again, so I am fairly confident in it. Also, our tests ensure that this did not break anything else.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2019:2262
Description of problem: Cockpit's fslist1 channel is being used in many cockpit pages, such as Docker, file autocompletion in the "SSH key" dialog or "Create new VM" on Machines. This code has a race condition, which is caught by the upstream test/verify/check-authorize test. If it fails, the bridge crashes with Oct 09 13:54:05 m1 systemd-coredump[1652]: Process 1564 (cockpit-bridge) of user 1000 dumped core. Stack trace of thread 1564: #0 0x00007fcbf8928855 _g_log_abort (libglib-2.0.so.0) #1 0x00007fcbf8929b8d g_logv (libglib-2.0.so.0) #2 0x00007fcbf8929d63 g_log (libglib-2.0.so.0) #3 0x000055b0a990546a cockpit_channel_control (cockpit-bridge) #4 0x000055b0a98e4465 on_files_listed (cockpit-bridge) #5 0x00007fcbf8e95d9f next_async_callback_wrapper (libgio-2.0.so.0) #6 0x00007fcbf8ecfe04 g_task_return_now (libgio-2.0.so.0) #7 0x00007fcbf8ecfe3d complete_in_idle_cb (libgio-2.0.so.0) #8 0x00007fcbf891f1cb g_idle_dispatch (libglib-2.0.so.0) #9 0x00007fcbf892288d g_main_context_dispatch (libglib-2.0.so.0) #10 0x00007fcbf8922c58 g_main_context_iterate.isra.21 (libglib-2.0.so.0) #11 0x00007fcbf8922cf0 g_main_context_iteration (libglib-2.0.so.0) #12 0x000055b0a98de06c main (cockpit-bridge) #13 0x00007fcbf782a11b __libc_start_main (libc.so.6) #14 0x000055b0a98dec4a _start (cockpit-bridge) which for the user results in a spontaneous disconnect of their session: https://fedorapeople.org/groups/cockpit/logs/pull-10252-20181009-132929-35c774e7-verify-fedora-atomic/TestReauthorize-testBasic-fedora-atomic-127.0.0.2-2301-FAIL.png This got fixed upstream in https://github.com/cockpit-project/cockpit/commit/9cde72ba36102 , and this would be good to backport to RHEL 7. Version-Release number of selected component (if applicable): cockpit-173-7.el7 How reproducible: Difficult. It happened pretty often in our upstream CI, due to the sheer mass of test runs that we do. Since the fix, it has never crashed again, so I am fairly confident in it. Also, our tests ensure that this did not break anything else.