[Bug 222624] [usb] [panic] thread's sleep queue 0 is not empty at usb_process.c:193

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222624

--- Comment #12 from Bernhard Froehlich <decke at FreeBSD.org> ---
Another panic but this time a different one still USB related as it seems.

FreeBSD 11.1-STABLE #1 r325275: Wed Nov  1 13:08:01 CET 2017

Unread portion of the kernel message buffer:
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex ehci0 (usb_def_mtx) r = 0 (0xfffffe0000fc3140) locked @
/usr/src/sys/dev/usb/controller/ehci.c:1465
stack backtrace:
#0 0xffffffff80abe640 at witness_debugger+0x70
#1 0xffffffff80abfa6e at witness_warn+0x45e
#2 0xffffffff80edb013 at trap_pfault+0x53
#3 0xffffffff80eda810 at trap+0x2b0
#4 0xffffffff80ebc671 at calltrap+0x8
#5 0xffffffff80886dd1 at ehci_interrupt+0x221
#6 0xffffffff80a22259 at intr_event_execute_handlers+0x99
#7 0xffffffff80a228f6 at ithread_loop+0xb6
#8 0xffffffff80a1f944 at fork_exit+0x84
#9 0xffffffff80ebcc5e at fork_trampoline+0xe


Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 06
fault virtual address   = 0x48
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80887814
stack pointer           = 0x28:0xfffffe0460cb2ab0
frame pointer           = 0x28:0xfffffe0460cb2ad0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 12 (irq23: ehci0)
trap number             = 12
panic: page fault
cpuid = 3
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0460cb2690
vpanic() at vpanic+0x186/frame 0xfffffe0460cb2710
panic() at panic+0x43/frame 0xfffffe0460cb2770
trap_fatal() at trap_fatal+0x322/frame 0xfffffe0460cb27c0
trap_pfault() at trap_pfault+0x62/frame 0xfffffe0460cb2820
trap() at trap+0x2b0/frame 0xfffffe0460cb29e0
calltrap() at calltrap+0x8/frame 0xfffffe0460cb29e0
--- trap 0xc, rip = 0xffffffff80887814, rsp = 0xfffffe0460cb2ab0, rbp =
0xfffffe0460cb2ad0 ---
ehci_check_transfer() at ehci_check_transfer+0x94/frame 0xfffffe0460cb2ad0
ehci_interrupt() at ehci_interrupt+0x221/frame 0xfffffe0460cb2b20
intr_event_execute_handlers() at intr_event_execute_handlers+0x99/frame
0xfffffe0460cb2b60
ithread_loop() at ithread_loop+0xb6/frame 0xfffffe0460cb2bb0
fork_exit() at fork_exit+0x84/frame 0xfffffe0460cb2bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0460cb2bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 11h1m19s

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