So far I have not had a re-occurrence of the crash.  It has only been a couple 
hours so far, will update if it happens or not over the next couple days. 


On Sat, Mar 25, 2017 at 03:03:14AM +0200, Konstantin Belousov wrote:
K> On Fri, Mar 24, 2017 at 05:40:15PM +0000, Darren wrote:
K> > I am getting this panic every hour to every couple of hours.
K> > 
K> > FreeBSD asrock 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r315684: Thu Mar 23 
14:56:45 EDT 2017     darren@asrock:/usr/obj/usr/src/sys/GENERIC  amd64
K> > I manually typed out the following, apologize for any typos. 
K> > 
K> > 
K> > panic: sleepq_add: td 0xfffff80003c01a40 to sleep on wchan 
0xfffff80006f0873c with sleeping prohibited
K> > cpuid = 0
K> > time = 1490372797
K> > KDB: stack backtrace:
K> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
K> > vpanic() at vpanic+0x19c/frame 0xfffffe0072e33710
K> > kassert_panic() at kassert_panic+0x126/frame 0xfffffe0072e33780
K> > sleepq_add() at sleepq_add+0x34f/frame 0xfffffe0072337d0
K> > _sleep() at _sleep+0x28d/frame 0xfffffe0072e33870
K> > soclose() at soclose+0xda/frame 0xfffffe0072e338b0
K> > _fdrop() at _fdrop+0x1a/frame 0xfffffe0072e338d0
K> > sendfile_iodone() at sendfile_iodone+0x19d/frame 0xfffffe0072e33910
K> > vnode_pager_generic_getpages_done_async() at 
vnode_pager_generic_getpages_done_async+037/frame 0xfffffe0072e33930
K> > bufdone() at bufdone+0x64/frame 0xfffffe0072e33960
K> > g_io_deliver() at g_io_deliver+0x276/frame 0xfffffe0072e339b0
K> > g_io_deliver() at g_io_deliver+0x276/frame 0xfffffe0072e33a00
K> > g_disk_done() at g_disk_done+0x104/frame 0xfffffe0072e33a40
K> > xpt_done_process() at xpt_done_process+0x35f/frame 0xfffffe0072e33a80
K> > xpt_done_direct() at ahci_ch_intr_direct+0xd5/frame 0xfffffe0072e33af0
K> > ahci_itr() at ahci_intr+0x102/frame 0xfffffe0072e33b20
K> > intr_event_execute_handlers() at intr_event_execute_handlers+0x99/frame 
K> > ithread_loop() at ithread_loop+0xb6/frame 0xfffffe0072e33bb0
K> > fork_exit() at fork_exit+0x84/frame 0xfffffe0072e33bf0
K> > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0072e33bf0
K> > --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
K> > KDB: enter: panic
K> > [ thread pid 12 tid 100038 ]
K> > Stopped at      kdb_enter+0x3b: movq    $0,kdb_why
K> > db>
K> Indeed, the context where sendfile_iodone() is executed, cannot call fdrop().

Can you please test the attached patch?

Totus tuus, Glebius.

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