Hi kazu
it looks ok(I added xxx myself for safety)
crash_arm64_v8.0.4++> sym sysdump_panic_event
ffffffxxxxx384 (t) sysdump_panic_event [xxx]
crash_arm64_v8.0.4++> whatis sysdump_panic_event
int sysdump_panic_event(struct notifier_block *, unsigned long, void *);
crash_arm64_v8.0.4++> gdb info line sysdump_panic_event
Line 759 of "drivers/xxxx.c" starts at address 0x4a74 and ends at 0x4a9c.
crash_arm64_v8.0.4++>