Hi Folks, I'm wondering if anyone has had issues with setting breakpoints. I'm able to break into the kernel, access data, do a backtrace, etc, but when I attempt to set a breakpoint, then continue, I get the following error:
Cannot insert breakpoint 1. Error accessing memory address 0xffffffff81310931: Unknown error 4294967295. I'm attaching a sample session, I had set remote debug to 1 Thanks! Pat Thomson [pstho...@psthomso-desk2 linux-2.6.36-rc6-kgdb]$ gdb ./vmlinux GNU gdb (GDB) Fedora (7.0.1-45.fc12) Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-redhat-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /home/psthomso/Kernels/linux-2.6.36-rc6-kgdb/vmlinux...done. (gdb) show architecture The target architecture is set automatically (currently i386:x86-64) (gdb) set debug remote 1 (gdb) target remote /dev/ttyS1 Remote debugging using /dev/ttyS1 Sending packet: $qSupported#37...Sending packet: $qSupported#37...Sending packet: $qSupported#37...Sending packet: $qSupported#37...Timed out. Timed out. Timed out. Ignoring packet error, continuing... Packet qSupported (supported-packets) is supported warning: unrecognized item "timeout" in "qSupported" response Sending packet: $Hg0#df...Sending packet: $Hg0#df...Sending packet: $Hg0#df...Sending packet: $Hg0#df...Ack Packet received: OK Sending packet: $?#3f...Ack Packet received: S05 Sending packet: $Hc-1#09...Ack Packet received: OK Sending packet: $qC#b4...Ack Packet received: QC00000000fffffffd Sending packet: $qAttached#8f...Ack Packet received: Packet qAttached (query-attached) is NOT supported Sending packet: $qOffsets#4b...Ack Packet received: Sending packet: $g#67...Ack Packet received: 140000000000000067000000000000000af00000000000000000e4010088ffff46000000000000004600000000000000c839e4010088ffffc839e4010088ffff0000000000000000730000000000000000dcca3f0288ffffc844c081ffffffff0030ef3f0288ffff7019a281ffffffff04000000000000009600000000000000cba40881ffffffff020000001000000018000000 kgdb_breakpoint (key=70, tty=0x46) at kernel/kgdb.c:1749 1749 wmb(); /* Sync point after breakpoint */ Sending packet: $qSymbol::#5b...Ack Packet received: Packet qSymbol (symbol-lookup) is NOT supported (gdb) bt Sending packet: $mffff880001e439c0,40#5e...Ack Packet received: c0a40881ffffffff183ae4010088fffffe972b81ffffffff82000000000000000100000000000000f839e4010088ffff220000000000000000dcca3f0288ffff Sending packet: $mffff880001e43a00,40#53...Ack Packet received: 01000000000000000030ef3f0288ffff0100000000000000283ae4010088ffff1c992b81ffffffff983ae4010088ffff391f2b81ffffffff983ae4010088ffff Sending packet: $mffff880001e43a80,40#5b...Ack Packet received: 220000000000000001000000000000000100000000000000e83ae4010088ffff80413681ffffffff010000000000000090b93a3f0288ffff2200000000000000 Sending packet: $mffff880001e43ac0,40#86...Ack Packet received: 00b03a3f0288ffff2200000000000000010000000000000001000000000000000100000000000000383be4010088ffff51613681ffffffff2ece17c964080000 Sending packet: $mffff880001e43b40,40#58...Ack Packet received: 53623681ffffffff883be4010088ffff0200000000000000883be4010088ffff1081383f0288ffff00b03a3f0288ffff01000000000000000080383f0288ffff Sending packet: $mffff880001e43b00,40#54...Ack Packet received: 0100000001000000310000000288ffff00b03a3f0288ffff0100000000000000f8b73a3f0288ffff22000000000000000100000000000000883be4010088ffff Sending packet: $mffff880001e43b80,40#5c...Ack Packet received: 0080383f0288ffffb83be4010088ffffe70c3a81ffffffff0080f83f0288ffff1081383f0288ffff0100000000000000204fa681ffffffff083ce4010088ffff Sending packet: $mffff880001e43bc0,40#87...Ack Packet received: b2f53981ffffffffd83be4010088ffff4600000001000000083ce4010088ffff0080383f0288ffff603cf3430288ffff0080f83f0288ffff0400000000000000 Sending packet: $mffff880001e43c00,40#55...Ack Packet received: 0000000000000000b83ce4010088ffff0dfa3981ffffffff0f2110ff0200ffff503ce4010088ffff8000000000ffffff0058753f0288ffff18c9cd4f0288ffff Sending packet: $mffff880001e43cc0,40#88...Ack Packet received: adfc3981ffffffffcc8d0181ffffffff07f081370088ffff0100000000000000204fa681ffffffff2d4e0681ffffffff00c0713f0288ffff80c4483f0288ffff Sending packet: $mffff880001e43c80,40#5d...Ack Packet received: 0100000000000000b83ce4010088ffff0080f83f0288ffff0058753f0288ffff00a8fb3f0288ffff00f081370088ffff0800000000000000183de4010088ffff Sending packet: $mffff880001e43d00,40#56...Ack Packet received: 0080f83f0288ffff0004e83f0288ffff0000000000000000583de4010088ffff05a63a81ffffffff383de4010088ffff80c4483f0288ffff0000000000000000 Sending packet: $mffff880001e43d40,40#5a...Ack Packet received: 0004e83f0288ffff0004e83f0288ffff30a680370088ffff883de4010088ffff75f13381ffffffff883de4010088ffff00a680370088ffff8005e83f0288ffff Sending packet: $mffff880001e43d80,40#5e...Ack Packet received: 80c4483f0288ffff083ee4010088ffff5acd3581ffffffffe83de4010088ffff2ea70d81ffffffff401da281ffffffff40030000fffffffff500000000000000 Sending packet: $mffff880001e43e00,40#57...Ack Packet received: 80c4483f0288ffff883ee4010088ffff65d73581ffffffff401da281ffffffffe04ee3460288ffffe84ee3460288ffff009380370088ffff00a680370088ffff Sending packet: $mffff880001e43e80,40#5f...Ack Packet received: 0000000000000000b83ee4010088ffff7ff63581ffffffff0004e83f0288ffff460200000000000000000000000000000000000000000000d83ee4010088ffff Sending packet: $mffff880001e43ec0,40#8a...Ack Packet received: 0ce83381ffffffffc09ccc3f0288ffff1500000000000000283fe4010088ffff1fc40881ffffffff489ed04f0288ffff0000000000000000083fe4010088ffff Sending packet: $mffff880001e43f00,40#58...Ack Packet received: 0073d53f0288ffff15000000000000006473d53f0288ffff489ed04f0288ffff0000000000000000583fe4010088ffff68e30881ffffffff0000000000000000 Sending packet: $mffff880001e43f40,40#5c...Ack Packet received: 150000000000000099000000000000001500000000000000783fe4010088ffff73520081ffffffff783fe4010088ffff0000000000000000a83fe4010088ffff Sending packet: $mffff880001e43f80,40#60...Ack Packet received: 84480081ffffffffd89fd04f0288ffffd89fd04f0288ffff00000000000000000000000000000000709ed04f0288ffff53a24581ffffffff709ed04f0288ffff Sending packet: $mffffffff8145a253,9#cf...Ack Packet received: fa0f1f800000000065 Sending packet: $mffffffff8145a239,1a#2c...Ack Packet received: 1f84000000000048830424804883ec50e80287baffe8d5a5baff Sending packet: $mffff88024fd09e70,9#6f...Ack Packet received: 089fd04f0288ffff48 Sending packet: $mffff88024fd09e56,1a#cc...Ack Packet received: 0000989ed04f0288ffffe0ede4010088ffff4ea24581ffffffff Sending packet: $mffff880001e43fc0,40#8b...Ack Packet received: 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Sending packet: $m0,9#02...Ack Packet received: E14 #0 kgdb_breakpoint (key=70, tty=0x46) at kernel/kgdb.c:1749 #1 sysrq_handle_gdb (key=70, tty=0x46) at kernel/kgdb.c:1609 #2 0xffffffff812b97fe in __handle_sysrq (key=103, tty=0xffff88023fef3000, check_mask=<value optimized out>) at drivers/char/sysrq.c:522 #3 0xffffffff812b991c in handle_sysrq (key=70, tty=0x46) at drivers/char/sysrq.c:554 #4 0xffffffff812b1f39 in kbd_keycode (handle=<value optimized out>, event_type=<value optimized out>, event_code=34, value=1) at drivers/char/keyboard.c:1204 #5 kbd_event (handle=<value optimized out>, event_type=<value optimized out>, event_code=34, value=1) at drivers/char/keyboard.c:1317 #6 0xffffffff81364180 in input_pass_event (dev=<value optimized out>, type=1, code=34, value=1) at drivers/input/input.c:118 #7 0xffffffff81366151 in input_handle_event (dev=0xffff88023f3ab000, type=1, code=34, value=1) at drivers/input/input.c:307 #8 0xffffffff81366253 in input_event (dev=0xffff88023f3ab000, type=1, code=34, value=1) at drivers/input/input.c:336 #9 0xffffffff813a0ce7 in hidinput_hid_event (hid=<value optimized out>, field=0xffff88023f388000, usage=0xffff88023f388110, value=1) at drivers/hid/hid-input.c:646 #10 0xffffffff8139f5b2 in hid_process_event (hid=0xffff88023ff88000, field=0xffff88023f388000, usage=0xffff88023f388110, value=1, interrupt=<value optimized out>) at drivers/hid/hid-core.c:875 ---Type <return> to continue, or q <return> to quit---q Quit (gdb) l 1744 void kgdb_breakpoint(void) 1745 { 1746 atomic_inc(&kgdb_setting_breakpoint); 1747 wmb(); /* Sync point before breakpoint */ 1748 arch_kgdb_breakpoint(); 1749 wmb(); /* Sync point after breakpoint */ 1750 atomic_dec(&kgdb_setting_breakpoint); 1751 } 1752 EXPORT_SYMBOL_GPL(kgdb_breakpoint); 1753 (gdb) p kgdb_setting_breakpoint Sending packet: $mffffffff81bbe694,4#32...Ack Packet received: 01000000 $1 = {counter = 1} (gdb) show breakpoint (gdb) b ata_xfer_mask2mode Sending packet: $mffffffff81310928,12#cc...Ack Packet received: 554889e50f1f44000083c8ff0fbdd70f44d0 Sending packet: $mffffffff81310928,1#9a...Ack Packet received: 55 Sending packet: $mffffffff81310929,3#9d...Ack Packet received: 4889e5 Sending packet: $mffffffff81310931,1#94...Ack Packet received: 83 Breakpoint 1 at 0xffffffff81310931: file drivers/ata/libata-core.c, line 918. (gdb) c Continuing. Sending packet: $Z0,ffffffff81310931,1#dd...Ack Packet received: E14 Packet Z0 (software-breakpoint) is supported Warning: Cannot insert breakpoint 1. Error accessing memory address 0xffffffff81310931: Unknown error 4294967295. (gdb) d 1 (gdb) c Continuing. Sending packet: $vCont?#49...Ack Packet received: Packet vCont (verbose-resume) is NOT supported Sending packet: $Hc0#db...Ack Packet received: OK Sending packet: $c#63...Ack ------------------------------------------------------------------------------ _______________________________________________ Kgdb-bugreport mailing list Kgdb-bugreport@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
