Date: Wed, 06 Feb 2002 07:37:13 +1100 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: freebsd-hackers@freebsd.org Subject: Patching a kernel Message-ID: <20020206073713.Z7444@gsmx07.alcatel.com.au>
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I'd like to patch a running kernel to disable an annoying non-rate-limited
message but gdb won't let me. (For various reasons, I don't want to have
to build a new kernel and reboot).
aalp03# chflags noschg /kernel
aalp03# gdb -k /kernel /dev/mem
GNU gdb 4.18
...
IdlePTD 3457024
initial pcb at 4d40000
panic messages:
---
---
#0 0xc0159bf0 in mi_switch ()
(kgdb) set write on
(kgdb) print {int}0xc01fffa4 = 0x00004eb8
kvm_write:write failed
(kgdb) show write
Writing into executable and core files is on.
(kgdb)
0xc01fffa4 is in the kernel text area.
This is 4.4-STABLE from mid-December running at securelevel -1.
Is there any way around this?
Peter
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