Date: Wed, 1 Nov 2017 11:14:08 +0100 From: Hans Petter Selasky <hps@selasky.org> To: =?UTF-8?Q?Jairo_Montes_Gonz=c3=a1lez?= <j.montes@bally-wulff.de>, ludovic.rousseau@free.fr, freebsd-current@freebsd.org, "Fernandez-Cueto, Roberto" <r.fernandez-cueto@bally-wulff.de> Subject: Re: pcsc-lite hangs up after unplugging an USB card reader Message-ID: <d6cafb7d-7bc1-558c-93ab-12a6dcaf051a@selasky.org> In-Reply-To: <27dc1898-074f-4e4b-849b-4985138eec1b@BW-EX-CASHUB.bally-wulff.de> References: <a45490b0-8a3e-4897-8b04-eb709d99411e@BW-EX-CASHUB.bally-wulff.de> <9b50e911-4a19-8f2c-75e9-17fa1b455edd@selasky.org> <27dc1898-074f-4e4b-849b-4985138eec1b@BW-EX-CASHUB.bally-wulff.de>
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On 11/01/17 12:05, Jairo Montes González wrote: > Jairo Montes schrieb am 01.11.2017 11:04 > _____________________________________________________________________ > > The output from "procstat -ak" is attached to this email. > Here are the relevant bits: > 898 100592 pcscd - mi_switch sleepq_switch sleepq_catch_signals sleepq_timedwait_sig _cv_timedwait_sig_sbt seltdwait kern_select sys_select amd64_syscall Xfast_syscall > 898 100699 pcscd - mi_switch sleepq_switch sleepq_catch_signals sleepq_wait_sig _sleep pipe_read dofileread kern_readv sys_read amd64_syscall Xfast_syscall > 898 100700 pcscd - mi_switch sleepq_switch sleepq_catch_signals sleepq_wait_sig _sleep umtxq_sleep do_wait __umtx_op_wait amd64_syscall Xfast_syscall > 898 100702 pcscd - mi_switch sleepq_switch sleepq_catch_signals sleepq_wait_sig _cv_wait_sig seltdwait kern_poll sys_poll amd64_syscall Xfast_syscall BTW: I see no USB processes hanging. It looks like pcscd is stuck: 1) waiting for select to complete (normal) 2) waiting on a mutex operation (might be an indication of deadlock) Try to do: thread 100700 bt I'm not sure how you can extend the backtrace into userspace. Maybe you need to do: gdb -p 898 thread 100700 bt To figure out where this software is stuck. It might look like a missed mutex unlock in some error path inside pcscd. --HPS
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