HP OpenVMS Systems Documentation

HP OpenVMS System Analysis Tools Manual

This excerpt illustrates the condensed form of the display produced in the first example.

SDA> SHOW SPINLOCKS/FULL SCHED
System static spinlock structures
---------------------------------
SCHED                                  Address        810AED00
Owner CPU ID       00000000            IPL            00000008
Ownership Depth    00000000            Rank           00000012
Timeout Interval   002DC6C0            Share Array    00000000
CPUs Waiting       00000001            Interlock        Free

Spins              00000000.0458E8DC   Busy waits     00252E8D
Acquires           00000000.01279BE0

Spinlock SPL$C_SCHED was last acquired or released from:
(Most recently)                 8004AD00 EXE$SWTIMER_FORK_C+00170
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170
       .                        80136A2C SCH$INTERRUPT+0070C
       .                        80117580 SCH$IDLE_C+002A0
       .                        8004B230 EXE$SWTIMER_FORK_C+006A0
       .                        8004AFC4 EXE$SWTIMER_FORK_C+00434
       .                        80117360 SCH$IDLE_C+00080
       .                        8012E5F4 EXE$HIBER_INT_C+00074
(Least recently)                80132150 EXE$SCHDWK_C+00110

Last release of multiple acquisitions occurred at:
                                80262A54 EXE$CHECK_VERSION_C+009F4
      

This display shows the detailed information on the SCHED spinlock, including the PC history.

Displays the location and contents of the process stacks (of the SDA current process) and the system stack.

Format

SHOW STACK {range|/ALL|[/EXECUTIVE|/INTERRUPT|/KERNEL |/PHYSICAL|/SUMMARY| /SUPERVISOR|/SYSTEM|/USER]} {/LONG|/QUAD (d)}

Parameter

range

Range of memory locations you want to display in stack format. You can express a range using the following syntax:

m:n	Range of addresses from m to n
m;n	Range of addresses starting at m and continuing for n bytes

Qualifiers

/ALL

Displays the locations and contents of the four process stacks for the SDA current process and the system stack.

/EXECUTIVE

Shows the executive stack for the SDA current process.

/INTERRUPT

Shows the system stack and is retained for compatibility with OpenVMS VAX. The interrupt stack does not exist in OpenVMS Alpha.

/KERNEL

Shows the kernel stack for the SDA current process.

/LONG

Displays longword width stacks. If you do not specify this qualifier, SDA by default displays quadword width stacks.

/PHYSICAL

Treats the start and end addresses in the given range as physical addresses. This qualifier is only relevant when a range is specified. By default, SDA treats range addresses as virtual addresses.

/QUAD

Displays quadword width stacks. This is the default.

/SUMMARY

Displays a list of all known stack ranges and the current stack pointer for each range.

/SUPERVISOR

Shows the supervisor stack for the SDA current process.

/SYSTEM

Shows the system stack.

/USER

Shows the user stack for the SDA current process.

Description

The SHOW STACK command, by default, displays the stack that was in use when the system failed, or, in the analysis of a running system, the current operating stack. For a process that became the SDA current process as the result of a SET PROCESS command, the SHOW STACK command by default shows its current operating stack.

The various qualifiers to the command allow display of any of the four per-process stacks for the SDA current process, as well as the system stack for the SDA current CPU. In addition, any given range can be displayed in stack format.

You can define SDA process and CPU context by using the SET CPU, SHOW CPU, SHOW CRASH, SET PROCESS, and SHOW PROCESS commands as indicated in their command descriptions. A complete discussion of SDA context control appears in Section 2.5.

SDA provides the following information in each stack display:

Section	Contents
Identity of stack	SDA indicates whether the stack is a process stack (user, supervisor, executive, or kernel) or the system stack.
Stack pointer	The stack pointer identifies the top of the stack. The display indicates the stack pointer by the symbol SP =>.
Stack address	SDA lists all the addresses that the operating system has allocated to the stack. The stack addresses are listed in a column that increases in increments of 8 bytes (one quadword) unless you specify the /LONG qualifier, in which case addresses are listed in increments of 4 (one longword).
Stack contents	SDA lists the contents of the stack in a column to the right of the stack addresses.
Symbols	SDA attempts to display the contents of a location symbolically, using a symbol and an offset. If the stack is being displayed in quadword width and the location cannot be symbolized as a quadword, SDA attempts to symbolize the least significant longword and then the most significant longword. If the address cannot be symbolized, this column is left blank.
Canonical stack	When displaying the kernel stack of a noncurrent process in a crash dump, SDA identifies the stack locations used by the scheduler to store the register contents of the process.
Mechanism array Signal array Exception frame	When displaying the current stack in a FATALEXCPT, INVEXCEPTN, SSRVEXCEPT, or UNXSIGNAL bugcheck, SDA identifies the stack locations used to store registers and other key data for these structures.

If a stack is empty, the display shows the following:

SP => (STACK IS EMPTY)

Examples

#1 SDA> SHOW STACK Current Operating Stack (SYSTEM): FFFFFFFF.8244BD08 FFFFFFFF.800600FC SCH$REPORT_EVENT_C+000FC FFFFFFFF.8244BD10 00000000.00000002 FFFFFFFF.8244BD18 00000000.00000005 FFFFFFFF.8244BD20 FFFFFFFF.8060C7C0 SP => FFFFFFFF.8244BD28 FFFFFFFF.8244BEE8 FFFFFFFF.8244BD30 FFFFFFFF.80018960 EXE$HWCLKINT_C+00260 FFFFFFFF.8244BD38 00000000.000001B8 FFFFFFFF.8244BD40 00000000.00000050 FFFFFFFF.8244BD48 00000000.00000210 UCB$N_RSID+00002 FFFFFFFF.8244BD50 00000000.00000000 FFFFFFFF.8244BD58 00000000.00000000 FFFFFFFF.8244BD60 FFFFFFFF.804045D0 SCH$GQ_IDLE_CPUS FFFFFFFF.8244BD68 FFFFFFFF.8041A340 EXE$GL_FKWAITFL+00020 FFFFFFFF.8244BD70 00000000.00000250 UCB$T_MSGDATA+00034 FFFFFFFF.8244BD78 00000000.00000001 CHF$IS_MCH_ARGS FFFFFFFF.8244BD80 00000000.0000002B CHF$PH_MCH_FRAME FFFFFFFF.8244BD88 FFFFFFFF.8244BFB0 CHF$IS_MCH_DEPTH FFFFFFFF.8244BD90 80000000.FFFFFFFD G CHF$PH_MCH_DADDR FFFFFFFF.8244BD98 00000000.00001600 CTL$C_CLIDATASZ+00060 CHF$PH_MCH_ESF_ADDR FFFFFFFF.8244BDA0 FFFFFFFF.8244BF40 CHF$PH_MCH_SIG_ADDR FFFFFFFF.8244BDA8 FFFFFFFF.8244BEE8 CHF$IH_MCH_SAVR0 FFFFFFFF.8244BDB0 FFFFFFFF.8041FB00 SMP$RELEASEL+00640 CHF$IH_MCH_SAVR1 FFFFFFFF.8244BDB8 00000000.00000000 CHF$IH_MCH_SAVR16 FFFFFFFF.8244BDC0 00000000.0000000D CHF$IH_MCH_SAVR17 FFFFFFFF.8244BDC8 0000FFF0.00007E04 CHF$IH_MCH_SAVR18 FFFFFFFF.8244BDD0 00000000.00000000 CHF$IH_MCH_SAVR19 FFFFFFFF.8244BDD8 00000000.00000001 CHF$IH_MCH_SAVR20 FFFFFFFF.8244BDE0 00000000.00000000 CHF$IH_MCH_SAVR21 FFFFFFFF.8244BDE8 FFFFFFFF.805AE4B6 SISR+0006E CHF$IH_MCH_SAVR22 FFFFFFFF.8244BDF0 00000000.00000001 CHF$IH_MCH_SAVR23 FFFFFFFF.8244BDF8 00000000.00000010 CHF$IH_MCH_SAVR24 FFFFFFFF.8244BE00 00000000.00000008 CHF$IH_MCH_SAVR25 FFFFFFFF.8244BE08 00000000.00000010 CHF$IH_MCH_SAVR26 FFFFFFFF.8244BE10 00000000.00000001 CHF$IH_MCH_SAVR27 FFFFFFFF.8244BE18 00000000.00000000 CHF$IH_MCH_SAVR28 FFFFFFFF.8244BE20 FFFFFFFF.804045D0 SCH$GQ_IDLE_CPUS FFFFFFFF.8244BE28 30000000.00000300 UCB$L_PI_SVA FFFFFFFF.8244BE30 FFFFFFFF.80040F6C EXE$REFLECT_C+00950 FFFFFFFF.8244BE38 18000000.00000300 UCB$L_PI_SVA FFFFFFFF.8244BE40 FFFFFFFF.804267A0 EXE$CONTSIGNAL+00228 FFFFFFFF.8244BE48 00000000.7FFD00A8 PIO$GW_IIOIMPA FFFFFFFF.8244BE50 00000003.00000000 FFFFFFFF.8244BE58 FFFFFFFF.8003FC20 EXE$CONNECT_SERVICES_C+00920 FFFFFFFF.8244BE60 FFFFFFFF.8041FB00 SMP$RELEASEL+00640 FFFFFFFF.8244BE68 00000000.00000000 FFFFFFFF.8244BE70 FFFFFFFF.8042CD50 SCH$WAIT_PROC+00060 FFFFFFFF.8244BE78 00000000.0000000D FFFFFFFF.8244BE80 0000FFF0.00007E04 FFFFFFFF.8244BE88 00000000.00000000 FFFFFFFF.8244BE90 00000000.00000001 FFFFFFFF.8244BE98 00000000.00000000 FFFFFFFF.8244BEA0 FFFFFFFF.805AE4B6 SISR+0006E FFFFFFFF.8244BEA8 00000000.00000001 FFFFFFFF.8244BEB0 00000000.00000010 FFFFFFFF.8244BEB8 00000000.00000008 FFFFFFFF.8244BEC0 00000000.00000010 FFFFFFFF.8244BEC8 00000000.00000001 FFFFFFFF.8244BED0 00000000.00000000 FFFFFFFF.8244BED8 FFFFFFFF.804045D0 SCH$GQ_IDLE_CPUS FFFFFFFF.8244BEE0 00000000.00000001 CHF$L_SIG_ARGS FFFFFFFF.8244BEE8 0000000C.00000005 CHF$L_SIG_ARG1 FFFFFFFF.8244BEF0 FFFFFFFC.00010000 SYS$K_VERSION_08 FFFFFFFF.8244BEF8 00000300.FFFFFFFC UCB$L_PI_SVA FFFFFFFF.8244BF00 00000002.00000001 FFFFFFFF.8244BF08 00000000.0000000C FFFFFFFF.8244BF10 00000000.00000000 FFFFFFFF.8244BF18 00000000.FFFFFFFC FFFFFFFF.8244BF20 00000008.00000000 FFFFFFFF.8244BF28 00000000.00000001 FFFFFFFF.8244BF30 00000008.00000000 FFFFFFFF.8244BF38 00000000.FFFFFFFC INTSTK$Q_R2 FFFFFFFF.8244BF40 FFFFFFFF.80404668 SCH$GL_ACTIVE_PRIORITY INTSTK$Q_R3 FFFFFFFF.8244BF48 FFFFFFFF.8042F280 SCH$WAIT_KERNEL_MODE INTSTK$Q_R4 FFFFFFFF.8244BF50 FFFFFFFF.80615F00 INTSTK$Q_R5 FFFFFFFF.8244BF58 00000000.00000000 INTSTK$Q_R6 FFFFFFFF.8244BF60 FFFFFFFF.805AE000 INTSTK$Q_R7 FFFFFFFF.8244BF68 00000000.00000000 INTSTK$Q_PC FFFFFFFF.8244BF70 00000000.FFFFFFFC INTSTK$Q_PS FFFFFFFF.8244BF78 30000000.00000300 UCB$L_PI_SVA FFFFFFFF.8244BF80 FFFFFFFF.80404668 SCH$GL_ACTIVE_PRIORITY FFFFFFFF.8244BF88 00000000.7FFD00A8 PIO$GW_IIOIMPA FFFFFFFF.8244BF90 00000000.00000000 FFFFFFFF.8244BF98 FFFFFFFF.8042CD50 SCH$WAIT_PROC+00060 FFFFFFFF.8244BFA0 00000000.00000044 FFFFFFFF.8244BFA8 FFFFFFFF.80403C30 SMP$GL_FLAGS Prev SP (8244BFB0) => FFFFFFFF.8244BFB0 FFFFFFFF.8042CD50 SCH$WAIT_PROC+00060 FFFFFFFF.8244BFB8 00000000.00000000 FFFFFFFF.8244BFC0 FFFFFFFF.805EE040 FFFFFFFF.8244BFC8 FFFFFFFF.8006DB54 PROCESS_MANAGEMENT_NPRO+0DB54 FFFFFFFF.8244BFD0 FFFFFFFF.80404668 SCH$GL_ACTIVE_PRIORITY FFFFFFFF.8244BFD8 FFFFFFFF.80615F00 FFFFFFFF.8244BFE0 FFFFFFFF.8041B220 SCH$RESOURCE_WAIT FFFFFFFF.8244BFE8 00000000.00000044 FFFFFFFF.8244BFF0 FFFFFFFF.80403C30 SMP$GL_FLAGS FFFFFFFF.8244BFF8 00000000.7FF95E00

The SHOW STACK command displays a system stack on an OpenVMS Alpha system. The data shown before the stack pointer may not be valid. The mechanism array, signal array, and exception frame symbols displayed on the left appear only for INVEXCEPTN, FATALEXCPT, UNXSIGNAL, and SSRVEXCEPT bugchecks.

#2 SDA> SHOW STACK/SUMMARY Stack Ranges ------------ Memory Stack: Stack Stack Base Stack Limit Stack Pointer Notes ----------- ----------------- ----------------- ----------------- --------- Kernel 00000000.7FF44000 00000000.7FF2C000 00000000.7FF43EB0 Current Executive 00000000.7FF68000 00000000.7FF58000 00000000.7FF68000 Supervisor 00000000.7FFAC000 00000000.7FFA8000 00000000.7FFAC000 User 00000000.3FFE2000 00000000.3FFCA000 00000000.3FFE1FB0 KPstack User 00000000.3FFFE000 00000000.3FFE6000 00000000.3FFFDDB0 KPstack User 00000000.7AC9E000 00000000.7AC9A000 00000000.7AC9D830 System FFFFFFFF.86970000 FFFFFFFF.86958000 FFFFFFFF.8696FFC0 Register Stack: Stack Stack Base Stack Limit Stack Pointer Notes ----------- ----------------- ----------------- ----------------- --------- Kernel 00000000.7FF12000 00000000.7FF2A000 00000000.7FF12250 Current Executive 00000000.7FF46000 00000000.7FF56000 00000000.7FF46000 Supervisor 00000000.7FF6A000 00000000.7FF8A000 00000000.7FF6A000 User 000007FD.BFF3C000 000007FD.BFF54000 000007FD.BFF3C160 KPstack User 000007FD.BFF58000 000007FD.BFF70000 000007FD.BFF58108 KPstack User 000007FD.C0000000 000007FD.C0002000 000007FD.C0000268 System FFFFF802.0F236000 FFFFF802.0F24E000 FFFFF802.0F236278

This example shows the stack ranges for a process on an OpenVMS I64 system.

Displays a list of all active processes and the values of the parameters used in swapping and scheduling these processes.

Format

SHOW SUMMARY [/IMAGE|/PROCESS_NAME=process_name
|/THREAD|/USER=username]

Parameters

None.

Qualifiers

/IMAGE

Causes SDA to display, if possible, the name of the image being executed within each process.

/PROCESS_NAME=process_name

Displays only processes with the specified process name. You can use wildcards in process_name, in which case SDA displays all matching processes. The default action is for SDA to display data for all processes, regardless of process name.

/THREAD

Displays information on all the current threads associated with the current process.

/USER=username

Displays only the processes of the specified user. You can use wildcards in username, in which case SDA displays processes of all matching users. The default action is for SDA to display data for all processes, regardless of user name.

Description

The SHOW SUMMARY command displays the information in Table 4-29 for each active process in the system.

Table 4-29 Process Information in the SHOW SUMMARY Display

Column	Contents
Extended PID	The 32-bit number that uniquely identifies the process or thread.
Indx	Index of this process into the PCB array. When SHOW SUMMARY/THREAD is used, for all threads of a process other than the initial thread, displays the thread number.
Process name 1	Name assigned to the process.
Username 1	Name of the user who created the process.
State	Current state of the process. Table 4-30 shows the 14 states and their meanings.
Pri	Current scheduling priority of the process.
PCB/KTB	Address of the process control block or address of the kernel thread block.
PHD 1	Address of the process header.
Wkset 1	Number (in decimal) of pages currently in the process working set.

Example

SDA>  SHOW SUMMARY
Current process summary
-----------------------
 Extended Indx Process name    Username    State   Pri PCB/KTB    PHD    Wkset
-- PID -- ---- --------------- ----------- ------- --- -------- -------- ------
 00000041 0001 SWAPPER                      HIB     16 80C641D0 80C63E00   0
 00000045 0005 IPCACP          SYSTEM       HIB     10 80DC0780 81266000  39
 00000046 0006 ERRFMT          SYSTEM       HIB      8 80DC2240 8126C000  57
 00000047 0007 OPCOM           SYSTEM       HIB      8 80DC3340 81272000  31
 00000048 0008 AUDIT_SERVER    AUDIT$SERVER HIB     10 80D61280 81278000 152
 00000049 0009 JOB_CONTROL     SYSTEM       HIB     10 80D620C0 8127E000  50
 0000004A 000A SECURITY_SERVER SYSTEM       HIB     10 80DC58C0 81284000 253
 0000004B 000B TP_SERVER       SYSTEM       HIB     10 80DC8900 8128A000  75
 0000004C 000C NETACP          DECNET       HIB     10 80DBFE00 8125A000  78
 0000004D 000D EVL             DECNET       HIB      6 80DCA080 81290000  76
 0000004E 000E REMACP          SYSTEM       HIB      8 80DE4E00 81296000  14
 00000050 0010 DECW$SERVER_0   SYSTEM       HIB      8 80DEF940 812A2000 739
 00000051 0011 DECW$LOGINOUT   <login>      LEF      4 80DF0F00 812A8000 273
 00000052 0012 SYSTEM          SYSTEM       LEF      9 80D772C0 81260000  75


      

The SHOW SUMMARY command describes all active processes in the system at the time of the system failure. Note that there was no process in the CUR state at the time of the failure.