Using 'sys' command, we can view the panic message with general system
information. If we run RISCV64-based vmcore, PANIC message is not properly
displayed.
The reason is that "Unable to handle kernel" is first printed in the kernel log
when exception occurs in the RISC-V based Linux kernel. The corresponding
kernel commit is 21733cb518471.
Without the patch:
crash> sys
KERNEL: vmlinux [TAINTED]
DUMPFILE: vmcore
CPUS: 4
DATE: Thu Aug 22 16:13:08 KST 2024
UPTIME: 00:33:25
LOAD AVERAGE: 0.07, 0.07, 0.02
TASKS: 385
NODENAME: starfive
RELEASE: 6.6.20+
VERSION: #13 SMP Mon Aug 19 12:58:52 KST 2024
MACHINE: riscv64 (unknown Mhz)
MEMORY: 4 GB
PANIC: ""
With the patch:
crash> sys
KERNEL: vmlinux [TAINTED]
DUMPFILE: vmcore
CPUS: 4
DATE: Thu Aug 22 16:13:08 KST 2024
UPTIME: 00:33:25
LOAD AVERAGE: 0.07, 0.07, 0.02
TASKS: 385
NODENAME: starfive
RELEASE: 6.6.20+
VERSION: #13 SMP Mon Aug 19 12:58:52 KST 2024
MACHINE: riscv64 (unknown Mhz)
MEMORY: 4 GB
PANIC: "Unable to handle kernel access to user memory without uaccess
routines at virtual address 0000000000000000"
Signed-off-by: Austin Kim <austindh....@gmail.com>
---
task.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/task.c b/task.c
index d52ce0b..443f488 100644
--- a/task.c
+++ b/task.c
@@ -6330,6 +6330,7 @@ static const char* panic_msg[] = {
"[Hardware Error]: ",
"Bad mode in ",
"Oops: ",
+ "Unable to handle kernel access ",
};
#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
--
2.17.1
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