Hello Dmitry, I'm glad to hear that you can refer symbols of loadable modules. Have you typed ^C and broke-in when a target is running? In previous mail, I told that supporting 2.6.18 is dropped. But the latest code does not care the content of structure. I am glad if someone finds that on which version of kernel works well with this. -caz
-----Original Message----- From: Dmitry Mikhin [mailto:[email protected]] Sent: Thursday, April 30, 2009 12:08 AM To: Caz Yokoyama Cc: [email protected] Subject: Re: [Kgdb-bugreport] debugging kernel modules with kgdb-light in 2.6.29.1 Hello, I solved the problem, it was my mistake. In first case breakpoint doesn't work because I haven't executed 'info shared'. In second case breakpoint doesn't work, because of 'rmmod and modprobe again' - this operation clears all SW breakpoints hooks on target. So I inserted sleep operation before ath_attach function: *** set_current_state(TASK_INTERRUPTIBLE); schedule_timeout (15000); *** During this sleep operation I'm connecting to target, executing info shared, and then setting breakpoint on ath_attach, and finally it works :) Regards, Dmitry. Caz Yokoyama wrote: > Hello Dmitry, > Please clarify if you can set a break point after "info shared". It is known > that symbol reading is done on "info shared". > -caz > > -----Original Message----- > From: Dmitry Mikhin [mailto:[email protected]] > Sent: Wednesday, April 29, 2009 9:32 AM > To: Mithlesh Thukral > Cc: [email protected]; Caz Yokoyama > Subject: Re: [Kgdb-bugreport] debugging kernel modules with kgdb-light in > 2.6.29.1 > > Thanks Mithlesh, it helps me. > > Caz, but after series of experiments I came up to fact, that breakpoints > doesn't work in modules :( > I do the following: > > 1. boot up target with no modules loaded > 2. connect gdb-kgdblight to target > 3. in gdb I'm setting breakpoint: > *** > (kgdb) b ath_attach > Function "ath_attach" not defined. > Make breakpoint pending on future shared library load? (y or [n]) y > Breakpoint 1 (ath_attach) pending. > *** > 4. then I'm loading module on target: > *** > modprobe ath_pci > *** > and I see printk messages from ath_attach (this function is executed on > module load), breakpoint doen't work in this case. > 5. then in gdb I do following: > *** > (kgdb) d > Delete all breakpoints? (y or n) y > (kgdb) info shared > Reading symbols from /root/dev/objs/ath_pci.ko...expanding to full > symbols...done. > Loaded symbols for /root/dev/objs/ath_pci.ko > Reading symbols from /root/dev/objs/ath_rate_ctrl.ko...expanding to full > symbols...done. > Loaded symbols for /root/dev/objs/ath_rate_ctrl.ko > Reading symbols from /root/dev/objs/wlan.ko...expanding to full > symbols...done. > Loaded symbols for /root/dev/objs/wlan.ko > Reading symbols from /root/dev/objs/ath_dfs.ko...expanding to full > symbols...done. > Loaded symbols for /root/dev/objs/ath_dfs.ko > Reading symbols from /root/dev/objs/ath_hal.ko...expanding to full > symbols...done. > Loaded symbols for /root/dev/objs/ath_hal.ko > From To Syms Read Shared Object Library > 0xe0766000 0xe07660f4 Yes /root/dev/objs/pcspkr.ko > 0xe076b000 0xe076e714 Yes /root/dev/objs/e100.ko > 0xe13df000 0xe13ecec0 Yes /root/dev/objs/ath_pci.ko > 0xe1236000 0xe1237950 Yes /root/dev/objs/ath_rate_ctrl.ko > 0xe1024000 0xe103ea34 Yes /root/dev/objs/wlan.ko > 0xe0a17000 0xe0a1ab9c Yes /root/dev/objs/ath_dfs.ko > 0xe0934000 0xe0952968 Yes /root/dev/objs/ath_hal.ko > (kgdb) b ath_attach > Breakpoint 3 at 0xe13e8cb0: file /root/dev/madwifi-9999/ath/if_ath.c, > line 426. > *** > 6. then on target i do rmmod and modprobe again, and even in this case I > see printk messages from ath_attach so breakpoint didn't stop code > execution what is wrong. > > Regards, > Dmitry. > > Mithlesh Thukral wrote: >> These messages are coming because you turned enabled remote debugging by : >> "set debug remote 1" >> >> HTH, >> Mithlesh Thukral > > ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Kgdb-bugreport mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
