vochong:

Whenever my Netgear r7500v2 running OpenWrt 19.07.2 is rebooted or power-cycled, the message ""No memory allocated for crashlog" is always shown in the kernel log.

If I try to simulate a kernel panic using "echo c > /proc/sysrq-trigger", no crashlog is generated in /sys/kernel/debug/.

KERNEL LOG - Netgear r7500v2 running 19.07.2

[ 0.043547] clocksource: Switched to clocksource dg_timer
[ 0.046802] NET: Registered protocol family 2
[ 0.047409] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.047450] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.047506] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.047600] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 0.047627] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 0.047808] NET: Registered protocol family 1
[ 0.047855] PCI: CLS 0 bytes, default 64

[ 0.049026] No memory allocated for crashlog

[ 0.049301] workingset: timestamp_bits=30 max_order=17 bucket_order=0
[ 0.054475] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.054494] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.061135] io scheduler noop registered
[ 0.061154] io scheduler deadline registered (default)
[ 0.062800] qcom-pcie 1b500000.pci: 1b500000.pci supply vdda not found, using d