[ofw] crash on IBBUS disabling while mad traffic

Smith, Stan stan.smith at intel.com
Mon May 18 13:33:02 PDT 2009


Leo,
  This patch, which I believe was committed as svn.4275, works fine if there are no IOUnits in the fabric. Once there is an IOU present, my case a Linux SRP target, this patch hangs HCA disable for a debug version of ibbus.

[AL]bus_release_resources(): Releasing BusFilter bfi-0
[AL]:al_cleanup(): Destroying \ device.
[AL]:al_cleanup(): Destroying AL Mgr.
[AL]sync_destroy_obj() !ERROR!: Error waiting for references to be released - delaying.
[AL]print_al_obj() !ERROR!: AL object 0000000082156200(AL_OBJ_TYPE_AL_MGR), parent: 0000000000000000 ref_cnt: 3

*** Assertion failed: cl_status == CL_SUCCESS
***   Source File: f:\openib-windows-svn\latest\gen1\trunk\core\al\al_common.c, line 554

Break repeatedly, break Once, Ignore, terminate Process, or terminate Thread (boipt)? i
i
[AL]sync_destroy_obj() !ERROR!: Forcing object destruction.
[AL]print_al_obj() !ERROR!: AL object 0000000082156200(AL_OBJ_TYPE_AL_MGR), parent: 0000000000000000 ref_cnt: 3
[AL]print_al_obj() !ERROR!: AL object 0000000082175270(AL_OBJ_TYPE_IOC_PNP_MGR), parent: 0000000082156200 ref_cnt: 1
[AL]print_al_obj() !ERROR!: AL object 00000000ff8ca2c0(AL_OBJ_TYPE_IOC_PNP_SVC), parent: 0000000082175270 ref_cnt: 2
[AL]print_al_obj() !ERROR!: AL object 0000000082175270(AL_OBJ_TYPE_IOC_PNP_MGR), parent: 0000000082156200 ref_cnt: 1
[AL]print_al_obj() !ERROR!: AL object 00000000ff8ca2c0(AL_OBJ_TYPE_IOC_PNP_SVC), parent: 0000000082175270 ref_cnt: 2
[AL]:al_cleanup(): Destroying async obj mgr.
[AL]:al_cleanup(): Destroying async pnp mgr.
[AL]:al_cleanup(): Destroying async proc mgr.
[AL]:al_cleanup(): Goodbye Cruel World =(
[AL]bus_release_resources() ]
Signaled to stop polling.
Polling thread terminated.
It seems there is a path in IBAL which is not releasing the reference on the IOC PnP service when an IOU is present in the fabric.
Perhaps you could suggest a fix?
If commit svn.4275 is removed the call to al_cleanup() returns successfully with no errors.

thanks,

Stan.

________________________________
From: Leonid Keller [mailto:leonid at mellanox.co.il]
Sent: Monday, April 27, 2009 5:38 AM
To: Leonid Keller; Fab Tillier; Smith, Stan
Cc: ofw at lists.openfabrics.org
Subject: RE: [ofw] crash on IBBUS disabling while mad traffic

Here is a possible explanation and a fix. Please, review.

__ioc_query_sa takes references on IOC PnP service before sending the node and path_record requests.
But these references get released at the end of __node_rec_cb and __path_rec_cb, while __process_sweep routine, which performs the IOU sweeping, is just scheduled to run in an async thread.
If the test happens to unload the driver after __node_rec_cb and __path_rec_cb and before __process_sweep started to run, IOC PnP service gets released and __process_sweep crashes.

The patch takes a reference on IOC PnP service before scheduling a thread for __process_sweep and releases the reference at the end of __process_sweep.
(Pay attention, that __process_sweep schedules a thread for itself twice while moving through its FSM:
SWEEP_IOU_INFO --> SWEEP_IOC_PROFILE --> SWEEP_SVC_ENTRIES --> SWEEP_COMPLETE)

Index: al/kernel/al_ioc_pnp.c
===================================================================
--- al/kernel/al_ioc_pnp.c (revision 3609)
+++ al/kernel/al_ioc_pnp.c (working copy)
@@ -2231,8 +2231,11 @@
   * If this is the last MAD, finish processing the IOU queries
   * in the PnP thread.
   */
- if( !cl_atomic_dec( &p_results->p_svc->query_cnt ) )
+ if( !cl_atomic_dec( &p_results->p_svc->query_cnt ) ) {
+  /* Reference the service till the end of processing in the thread */
+  ref_al_obj( &p_results->p_svc->obj );
   cl_async_proc_queue( gp_async_pnp_mgr, &p_results->async_item );
+ }

  AL_EXIT( AL_DBG_PNP );
 }
@@ -2354,6 +2357,8 @@
   if( !cl_atomic_dec( &gp_ioc_pnp->query_cnt ) )
    cl_async_proc_queue( gp_async_pnp_mgr, &gp_ioc_pnp->async_item );
   cl_free( p_results );
+  /* Release the reference taken for the query. */
+  deref_al_obj( &p_results->p_svc->obj );
  }

  AL_EXIT( AL_DBG_PNP );


________________________________
From: Leonid Keller
Sent: Sunday, April 26, 2009 1:05 AM
To: 'Fab Tillier'; 'Smith, Stan'
Cc: ofw at lists.openfabrics.org
Subject: [ofw] crash on IBBUS disabling while mad traffic

I've got a crash while running WHQL Disable Enable test while opensm was running on another node.
I was running a December version of the driver, but i'm not sure this will work with current one. (i'll try)

The test, which makes disable/enable to all devices, passes without opensm.
With opensm IBBUS sends SA requests to opensm.
In this case __process_sweep() fails, because per-port IOC PnP agent seems to be already released.
The latter is strange, because __ioc_query_sa takes reference on PnP agent before sending request.
   __ioc_query_sa
    __node_rec_cb
     __process_query
      __process_sweep
Any ideas ?


3: kd> !analyze -v
ERROR: FindPlugIns 8007007b
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

DRIVER_PAGE_FAULT_IN_FREED_SPECIAL_POOL (d5)
Memory was referenced after it was freed.
This cannot be protected by try-except.
When possible, the guilty driver's name (Unicode string) is printed on
the bugcheck screen and saved in KiBugCheckDriver.
Arguments:
Arg1: fffff98005b72f84, memory referenced
Arg2: 0000000000000000, value 0 = read operation, 1 = write operation
Arg3: fffffa600400b1d0, if non-zero, the address which referenced memory.
Arg4: 0000000000000000, (reserved)

Debugging Details:
------------------

Matched: ibbus!proxy_ioctl+0x41 (fffffa60`04031d8d)
Matched: ibbus!proxy_ioctl+0xa5 (fffffa60`04031df1)

READ_ADDRESS:  fffff98005b72f84 Special pool

FAULTING_IP:
ibbus!__process_sweep+44 [s:\builds\3609\branches\mlnx_winof_2-0\core\al\kernel\al_ioc_pnp.c @ 2315]
fffffa60`0400b1d0 83b8d400000003  cmp     dword ptr [rax+0D4h],3

MM_INTERNAL_CODE:  0

IMAGE_NAME:  ibbus.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  49401b3e

MODULE_NAME: ibbus

FAULTING_MODULE: fffffa6004002000 ibbus

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

BUGCHECK_STR:  0xD5

PROCESS_NAME:  System

CURRENT_IRQL:  f

TRAP_FRAME:  fffffa6003d50b00 -- (.trap 0xfffffa6003d50b00)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=fffff98005b72eb0 rbx=0000000000000000 rcx=fffffa6004057780
rdx=fffffa6004005e97 rsi=fffffa600199ccc0 rdi=fffff80001cc0304
rip=fffffa600400b1d0 rsp=fffffa6003d50c90 rbp=0000000000000080
 r8=0000000000000005  r9=fffffa6004005e97 r10=0000000000000001
r11=fffffa6003d50c50 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei pl zr na po nc
ibbus!__process_sweep+0x44:
fffffa60`0400b1d0 83b8d400000003  cmp     dword ptr [rax+0D4h],3 ds:fffff980`05b72f84=????????
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80001969c42 to fffff800018b0b30

STACK_TEXT:
fffffa60`03d502f8 fffff800`01969c42 : fffffa80`0e0eb290 fffff800`0194893d fffff800`01a55140 00000000`00001000 : nt!RtlpBreakWithStatusInstruction
fffffa60`03d50300 fffff800`0196adb7 : fffff800`00000004 fffff800`01a55140 ffffffff`fffff000 00000000`00000050 : nt!KiBugCheckDebugBreak+0x12
fffffa60`03d50360 fffff800`018b6754 : fffffa80`0dd77480 fffff800`01cc2bb9 00000000`00000000 fffff800`0194c13f : nt!KeBugCheck2+0xaa7
fffffa60`03d509d0 fffff800`018c5671 : 00000000`00000050 fffff980`05b72f84 00000000`00000000 fffffa60`03d50b00 : nt!KeBugCheckEx+0x104
fffffa60`03d50a10 fffff800`018b51d9 : 00000000`00000000 fffff980`0427cf78 fffffa80`0e0ecf00 fffff980`1c27ef40 : nt!MmAccessFault+0x1371
fffffa60`03d50b00 fffffa60`0400b1d0 : fffff980`1c27ef40 fffff980`04318e00 fffffa60`04005eba fffff980`04318e78 : nt!KiPageFault+0x119
fffffa60`03d50c90 fffffa60`04005e9d : fffff980`04318e98 fffff980`043bccb0 fffff980`1b88afd0 fffff980`04318e78 : ibbus!__process_sweep+0x44 [s:\builds\3609\branches\mlnx_winof_2-0\core\al\kernel\al_ioc_pnp.c @ 2315]
fffffa60`03d50cc0 fffffa60`040070d9 : fffff980`04318d60 fffff980`0434afd0 00000000`00000000 fffffa60`0400743c : ibbus!__cl_async_proc_worker+0x61 [s:\builds\3609\branches\mlnx_winof_2-0\core\complib\cl_async_proc.c @ 153]
fffffa60`03d50cf0 fffffa60`04007464 : fffff980`0434afd0 00000000`00000080 fffff980`0434afd0 8b8b8b8b`8b8b8b8b : ibbus!__cl_thread_pool_routine+0x41 [s:\builds\3609\branches\mlnx_winof_2-0\core\complib\cl_threadpool.c @ 66]
fffffa60`03d50d20 fffff800`01adafd3 : 8b8b8b8b`8b8b8b8b 8b8b8b8b`8b8b8b8b 8b8b8b8b`8b8b8b8b 8b8b8b8b`8b8b8b01 : ibbus!__thread_callback+0x28 [s:\builds\3609\branches\mlnx_winof_2-0\core\complib\kernel\cl_thread.c @ 49]
fffffa60`03d50d50 fffff800`018f0816 : fffffa60`01999180 fffffa80`0e0eb290 fffffa60`019a2d40 00000000`00000001 : nt!PspSystemThreadStartup+0x57
fffffa60`03d50d80 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiStartSystemThread+0x16


STACK_COMMAND:  kb

FOLLOWUP_IP:
ibbus!__process_sweep+44 [s:\builds\3609\branches\mlnx_winof_2-0\core\al\kernel\al_ioc_pnp.c @ 2315]
fffffa60`0400b1d0 83b8d400000003  cmp     dword ptr [rax+0D4h],3

FAULTING_SOURCE_CODE:
  2311:
  2312:  p_results = PARENT_STRUCT( p_async_item, ioc_sweep_results_t, async_item );
  2313:  CL_ASSERT( !p_results->p_svc->query_cnt );
  2314:
> 2315:  if( p_results->p_svc->obj.state == CL_DESTROYING )
  2316:  {
  2317:   __put_iou_map( gp_ioc_pnp, &p_results->iou_map );
  2318:   goto err;
  2319:  }
  2320:


SYMBOL_STACK_INDEX:  6

SYMBOL_NAME:  ibbus!__process_sweep+44

FOLLOWUP_NAME:  MachineOwner

FAILURE_BUCKET_ID:  X64_0xD5_VRF_ibbus!__process_sweep+44

BUCKET_ID:  X64_0xD5_VRF_ibbus!__process_sweep+44

Followup: MachineOwner
---------


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