Re: r315684 panic: sleepq_add: td 0xfffff80003c01a40 to sleep on wchan 0xfffff80006f0873c with sleeping prohibited

From: Konstantin Belousov <kostikbel_at_gmail.com>
Date: Sat, 25 Mar 2017 03:03:14 +0200
On Fri, Mar 24, 2017 at 05:40:15PM +0000, Darren wrote:
> I am getting this panic every hour to every couple of hours.
> 
> FreeBSD asrock 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r315684: Thu Mar 23 14:56:45 EDT 2017šššš darren_at_asrock:/usr/obj/usr/src/sys/GENERICš amd64
> I manually typed out the following, apologize for any typos. 
> 
> 
> panic: sleepq_add: td 0xfffff80003c01a40 to sleep on wchan 0xfffff80006f0873c with sleeping prohibited
> cpuid = 0
> time = 1490372797
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0072e33690
> vpanic() at vpanic+0x19c/frame 0xfffffe0072e33710
> kassert_panic() at kassert_panic+0x126/frame 0xfffffe0072e33780
> sleepq_add() at sleepq_add+0x34f/frame 0xfffffe0072337d0
> _sleep() at _sleep+0x28d/frame 0xfffffe0072e33870
> soclose() at soclose+0xda/frame 0xfffffe0072e338b0
> _fdrop() at _fdrop+0x1a/frame 0xfffffe0072e338d0
> sendfile_iodone() at sendfile_iodone+0x19d/frame 0xfffffe0072e33910
> vnode_pager_generic_getpages_done_async() at vnode_pager_generic_getpages_done_async+037/frame 0xfffffe0072e33930
> bufdone() at bufdone+0x64/frame 0xfffffe0072e33960
> g_io_deliver() at g_io_deliver+0x276/frame 0xfffffe0072e339b0
> g_io_deliver() at g_io_deliver+0x276/frame 0xfffffe0072e33a00
> g_disk_done() at g_disk_done+0x104/frame 0xfffffe0072e33a40
> xpt_done_process() at xpt_done_process+0x35f/frame 0xfffffe0072e33a80
> xpt_done_direct() at ahci_ch_intr_direct+0xd5/frame 0xfffffe0072e33af0
> ahci_itr() at ahci_intr+0x102/frame 0xfffffe0072e33b20
> intr_event_execute_handlers() at intr_event_execute_handlers+0x99/frame 0xfffffe0072e33b60
> ithread_loop() at ithread_loop+0xb6/frame 0xfffffe0072e33bb0
> fork_exit() at fork_exit+0x84/frame 0xfffffe0072e33bf0
> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0072e33bf0
> --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
> KDB: enter: panic
> [ thread pid 12 tid 100038 ]
> Stopped atššššš kdb_enter+0x3b: movqššš $0,kdb_why
> db>

Indeed, the context where sendfile_iodone() is executed, cannot call fdrop().
Received on Sat Mar 25 2017 - 00:03:21 UTC

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