Hi.

I took some look and think problems are in scan_for_luns() routine:
- After the locking changes scanning normally uses different locks, not the SIM one. That probably caused panic. - But I think that scanning is simply not needed there -- FreeBSD CAM scans every new bus automatically on registration (Even for late registered buses it is done I think at least since FreeBSD 8). I think everything should just work if you remove scan_for_luns() at all. - If you still wish to force scan (due to having information about changed list of devices, etc), then you can make CAM do all the magic for you by calling xpt_rescan().

On 24.10.2013 08:34, Oleg Sidorkin wrote:
Hello again.

Camlock patches are now committed and -CURRENT on Hyper-V now panics
with almost the same stacktrace:

FreeBSD 11.0-CURRENT #16 r257016: Wed Oct 23 21:08:44 UTC 2013
     olsi@current:/usr/obj/usr/src/sys/HYPERVKERNEL amd64
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
CPU: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz (1309.57-MHz K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x206a7  Family = 0x6  Model = 0x2a
Stepping = 7

......

ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
Timecounters tick every 10.000 msec
storvsc0 on vmbus0
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x20
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff804f58cc
stack pointer           = 0x28:0xfffffe011dd5f5d0
frame pointer           = 0x28:0xfffffe011dd5f600
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 0 (hv_control_1 taskq)
[ thread pid 0 tid 100047 ]
Stopped at      turnstile_broadcast+0x8c:       movq    0x20(%rbx,%rax,1),%rdx
db> bt
Tracing pid 0 tid 100047 td 0xfffff8000331e000
turnstile_broadcast() at turnstile_broadcast+0x8c/frame 0xfffffe011dd5f600
__mtx_unlock_sleep() at __mtx_unlock_sleep+0x60/frame 0xfffffe011dd5f630
unlock_mtx() at unlock_mtx+0x2a/frame 0xfffffe011dd5f640
_sleep() at _sleep+0x18e/frame 0xfffffe011dd5f6c0
cam_periph_runccb() at cam_periph_runccb+0x9e/frame 0xfffffe011dd5f7f0
storvsc_attach() at storvsc_attach+0x6d4/frame 0xfffffe011dd5f890
device_attach() at device_attach+0x3a2/frame 0xfffffe011dd5f8f0
hv_vmbus_child_device_register() at
hv_vmbus_child_device_register+0xdb/frame 0xfffffe011dd5f990
vmbus_channel_process_offer() at
vmbus_channel_process_offer+0x133/frame 0xfffffe011dd5f9d0
work_item_callback() at work_item_callback+0x26/frame 0xfffffe011dd5f9f0
taskqueue_run_locked() at taskqueue_run_locked+0xe6/frame 0xfffffe011dd5fa40
taskqueue_thread_loop() at taskqueue_thread_loop+0xa8/frame 0xfffffe011dd5fa70
fork_exit() at fork_exit+0x9a/frame 0xfffffe011dd5fab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe011dd5fab0
--- trap 0, rip = 0, rsp = 0xfffffe011dd5fb70, rbp = 0 ---


Thanks

On Tue, Sep 24, 2013 at 3:04 AM, Abhishek Gupta (LIS)
<abgu...@microsoft.com> wrote:
Hi Oleg,

Please give us some time. I shall look at it. Thanks for reporting.

Regards,
Abhishek

-----Original Message-----
From: owner-freebsd-virtualizat...@freebsd.org 
[mailto:owner-freebsd-virtualizat...@freebsd.org] On Behalf Of Oleg Sidorkin
Sent: Monday, September 23, 2013 7:21 AM
To: freebsd-virtualization@freebsd.org
Cc: Alexander Motin
Subject: [Hyper-V][camlock] storvsc driver panics during boot with patches from 
camlock project

Hello.

I'm running the latest current (amd64) under Hyper-V with hyper-v services 
enabled.
If camlock patches are applied
(http://people.freebsd.org/~mav/camlock_patches/camlock_20130906.patch),
I'm hitting the following  kernel panic during boot:

FreeBSD 10.0-ALPHA2 #5 r255762M: Sun Sep 22 16:48:21 UTC 2013
     olsi@current:/usr/obj/usr/src/sys/HYPERVKERNEL amd64 FreeBSD clang version 
3.3 (tags/RELEASE_33/final 183502) 20130610
CPU: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz (1309.17-MHz K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x206a7  Family = 0x6  Model = 0x2a Stepping =
                             7
....
Timecounter "Hyper-V" frequency 10000000 Hz quality 10000000 ZFS NOTICE: 
Prefetch is disabled by default if less than 4GB of RAM is present;
             to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf.
ZFS filesystem version: 5
ZFS storage pool version: features support (5000) Timecounters tick every 
10.000 msec
storvsc0 on vmbus0
Netvsc initializing... SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #1 Launched!
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode cpuid = 3; apic id = 03
fault virtual address   = 0x20
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff804f444c
stack pointer           = 0x28:0xfffffe011df38610
frame pointer           = 0x28:0xfffffe011df38640
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 0 (hv_control_1 taskq)
[ thread pid 0 tid 100046 ]
Stopped at      turnstile_broadcast+0x8c:       movq    0x20(%rbx,%rax,1),%rdx
db> bt
Tracing pid 0 tid 100046 td 0xfffff80001f20490
turnstile_broadcast() at turnstile_broadcast+0x8c/frame 0xfffffe011df38640
__mtx_unlock_sleep() at __mtx_unlock_sleep+0x60/frame 0xfffffe011df38670
unlock_mtx() at unlock_mtx+0x2a/frame 0xfffffe011df38680
_sleep() at _sleep+0x18e/frame 0xfffffe011df38700
cam_periph_runccb() at cam_periph_runccb+0x9e/frame 0xfffffe011df38800
storvsc_attach() at storvsc_attach+0x6d4/frame 0xfffffe011df388a0
device_attach() at device_attach+0x396/frame 0xfffffe011df388f0
hv_vmbus_child_device_register() at
hv_vmbus_child_device_register+0xdb/frame 0xfffffe011df38990
vmbus_channel_process_offer() at
vmbus_channel_process_offer+0x133/frame 0xfffffe011df389d0
work_item_callback() at work_item_callback+0x26/frame 0xfffffe011df389f0
taskqueue_run_locked() at taskqueue_run_locked+0xe6/frame 0xfffffe011df38a40
taskqueue_thread_loop() at taskqueue_thread_loop+0xa8/frame 0xfffffe011df38a70
fork_exit() at fork_exit+0x9a/frame 0xfffffe011df38ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe011df38ab0
--- trap 0, rip = 0, rsp = 0xfffffe011df38b70, rbp = 0 ---
db>


This patch is not commited yet (CFT thread with changes description is
here: 
http://lists.freebsd.org/pipermail/freebsd-hackers/2013-September/043333.html),
but it is going to be commited till the end of the year.

As far as I understand, the invocation chain is 
storvsc_attach->scan_for_luns->cam_periph_runccb

Thanks
--
Oleg Sidorkin
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--
Alexander Motin
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