Solaris Tunable Parameters Reference Manual

moddebug

Description

Variable that you can set to values that cause messages about various steps in the module loading process to be displayed.

Data Type

Signed integer

Default

0 (messages off)

Range

The most useful values are:

  • 0x80000000 - Prints [un] loading... message. For every module loaded, messages such as the following would appear on the console and in the /var/adm/messages file:


    Nov 5 16:12:28 sys genunix: [ID 943528 kern.notice] 
    load 'sched/ TS_DPTBL' id 9 loaded @ 0x10126438/
    0x10438dd8 size 132/2064
    Nov 5 16:12:28 sys genunix: [ID 131579 kern.notice] 
    installing TS_DPTBL, module id 9.
  • 0x40000000 - Prints detailed error messages. For every module loaded, messages such as the following would appear on the console and in the /var/adm/messages file:


    Nov 5 16:16:50 sys krtld: [ID 284770 kern.notice] 
    kobj_open: can't open /platform/SUNW,Ultra-1/kernel/
    sched/TS_DPTBL
    Nov 5 16:16:50 sys krtld: [ID 284770 kern.notice] 
    kobj_open: can't open /platform/sun4u/kernel/
    sched/TS_DPTBL
    Nov 5 16:16:50 sys krtld: [ID 797908 kern.notice]
    kobj_open: '/kernel/sch...
    Nov 5 16:16:50 sys krtld: [ID 605504 kern.notice]
    descr = 0x2a
    Nov 5 16:16:50 sys krtld: [ID 642728 kern.notice] 
    kobj_read_file: size=34,
    Nov 5 16:16:50 sys krtld: [ID 217760 kern.notice]
    offset=0
    Nov 5 16:16:50 sys krtld: [ID 136382 kern.notice]
    kobj_read: req 8192 bytes,
    Nov 5 16:16:50 sys krtld: [ID 295989 kern.notice]
    got 4224
    Nov 5 16:16:50 sys krtld: [ID 426732 kern.notice] 
    read 1080 bytes
    Nov 5 16:16:50 sys krtld: [ID 720464 kern.notice]
    copying 34 bytes
    Nov 5 16:16:50 sys krtld: [ID 234587 kern.notice]
    count = 34 [33 lines elided]
    Nov 5 16:16:50 sys genunix: [ID 943528 kern.notice]
    load 'sched/TS_DPTBL' id 9 loaded @ 0x10126438/
    0x10438dd8 size 132/2064
    Nov 5 16:16:50 sys genunix: [ID 131579 kern.notice] 
    installing TS_DPTBL, module id 9.
    Nov 5 16:16:50 sys genunix: [ID 324367 kern.notice]
    init 'sched/TS_DPTBL' id 9 loaded @ 0x10126438/
    0x10438dd8 size 132/2064
  • 0x20000000 - Prints even more detailed messages. This doesn't print any additional information beyond what the detailed error message flag does during system boot, but it does print additional information about releasing the module when the module is unloaded.

These values can be added together to set the final value.

Dynamic?

Yes

Validation

None

When to Change

When a module is either not loading as expected or the system seems to hang while loading modules. Note that when print detailed messages is set, system boot is slowed down considerably by the number of messages written to the console.

Commitment Level

Unstable