https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243420
Bug ID: 243420
Summary: page fault in if_io_tqg_0 on virtualized guest
Product: Base System
Version: 12.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: mqu...@neosmart.net
Greetings.
I have FreeBSD 12.1-RELEASE-p1 GENERIC (unmodified) amd64 running under ESXi
6.7, and have had no problems whatsoever for a number of years.
While using ctld to serve a zvol as an iscsi target, I ran into a kernel panic
(which I'll try to reproduce), summarized below:
------------------------------------------------------------------
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x0
fault code = supervisor write data, page not present
instruction pointer = 0x20:0xffffffff80cef252
stack pointer = 0x28:0xfffffe0075da18c0
frame pointer = 0x28:0xfffffe0075da19a0
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 = 0 (if_io_tqg_0)
trap number = 12
panic: page fault
cpuid = 0
time = 1579311312
KDB: stack backtrace:
#0 0xffffffff80c1d297 at kdb_backtrace+0x67
#1 0xffffffff80bd05cd at vpanic+0x19d
#2 0xffffffff80bd0423 at panic+0x43
#3 0xffffffff810a7dcc at trap_fatal+0x39c
#4 0xffffffff810a7e19 at trap_pfault+0x49
#5 0xffffffff810a740f at trap+0x29f
#6 0xffffffff81081a0c at calltrap+0x8
#7 0xffffffff80ce9be5 at _task_fn_rx+0x75
#8 0xffffffff80c1bb54 at gtaskqueue_run_locked+0x144
#9 0xffffffff80c1b7b8 at gtaskqueue_thread_loop+0x98
#10 0xffffffff80b90c23 at fork_exit+0x83
#11 0xffffffff81082a4e at fork_trampoline+0xe
------------------------------------------------------------------
I recently upgraded the host machine and in the process switched from vmxnet3
virtualized network adapters to SR-IOV from the (same) Intel T520-CR. I had no
problems in the past with an exclusively vmxnet3 configuration, but before I
rush to blame it on if_ixv I must note that iSCSI is being served over the
usual and boring vmxnet3 interface.
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