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SubjectRe: do_syslog/__down_trylock lockup in current BK

the lockup, on both CPUs:

>>EIP; c01200b1 <zap_thread+21/16d> <=====
Trace; c0120092 <zap_thread+2/16d>
Trace; c011f00c <exit_notify+10c/230>
Trace; c011f41a <do_exit+2ea/370>
Trace; c0125755 <schedule_timeout+b5/c0>
Trace; c0126686 <sig_exit+36/40>
Trace; c0127c54 <get_signal_to_deliver+2d4/360>
Trace; c0107cf3 <do_signal+c3/100>
Trace; c012d572 <sys_futex+182/1b0>
Trace; c0107fce <work_notifysig+13/15>

>>EIP; c0106c5f <__write_lock_failed+f/20> <=====
Trace; c0120316 <.text.lock.exit+119/133>
Trace; c011ef16 <exit_notify+16/230>
Trace; c011f41a <do_exit+2ea/370>
Trace; c0125755 <schedule_timeout+b5/c0>
Trace; c0126686 <sig_exit+36/40>
Trace; c0127c54 <get_signal_to_deliver+2d4/360>
Trace; c0107cf3 <do_signal+c3/100>
Trace; c012d572 <sys_futex+182/1b0>
Trace; c0107fce <work_notifysig+13/15>

ie. either the 'zap_again' produces an infinite loop, or one of the lists
became corrupted. I suspect the former.

Ingo

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