Andriy Gapon wrote:
on 03/02/2010 13:23 Stephane LAPIE said the following:I just rebuilt a kernel with debugger options, and obtained the following output upon pulling out one disk :Sleeping thread (tid 100024, pid 0) owns a non-sleepable lock sched_switch() at sched_switch+0xf8 mi_switch() at mi_switch+0x16f sleepq_timedwait() at sleepq_timedwait+0x42 _cv_timedwait() at _cv_timedwait+0x129 _sema_timedwait() at _sema_timedwait+0x55 ata_queue_request() at ata_queue_request+0x526 ata_controlcmd() at ata_controlcmd+0xa1 ata_setmode() at ata_setmode+0xdc ad_init() at ad_init+0x27 ad_reinit() at ad_reinit+0x48 ata_reinit() at ata_reinit+0x268 ata_conn_event() at ata_conn_event+0x49 taskqueue_run() at taskqueue_run+0x93 taskqueue_thread_loop() at taskqueue_thread_loop+0x46 fork_exit() at fork_exit+0x118 fork_trampoline() at fork_trampoline+0xe --- trap 0, rip = 0, rsp = 0xffffff80000aad30, rbp = 0 --- panic: sleeping thread cpuid = 2 KDB: enter: panic [thread pid 12 tid 100008 ] Stopped at kdb_enter+0x3d: movq $0,0x4943d0(%rip)Not sure if I can derive anything useful from here. Someone with more expertise is needed. One thing I noticed is that ata_conn_event and ata_reinit and some other functions up the stack acquire state_mtx recursively, but the mutex is not initialized with MTX_RECURSE. Perhaps, indeed you would have a better luck with AHCI controller _and_ ahci(4) driver. It seems to handle dynamic coming and going of disks much better than ata(4).
I just moved half of the "flaky" drives on an AHCI controller.This seems to work much better, starting with disk detection issues being solved, and hotplug working exactly like SCSI does. It does require using camcontrol to recognize the disks again, but that much is not exactly a problem.
Although I'm probably dreaming : Did anyone heard about AHCI controllers beside the on-board ones ?
Thanks to everyone for their advice. -- Stephane LAPIE, EPITA SRS, Promo 2005 "Even when they have digital readouts, I can't understand them." --MegaTokyo
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