Hi! I tried to make the kernel dump, but I found a strange situation. I can't create it when sending echo c > /proc/sysrq-trigger .
My settings: # cat /etc/default/kdump-tools USE_KDUMP=1 KDUMP_RUNLEVEL="1" KDUMP_SAVEDIR="file:///var/crash" KDUMP_NET="none" KDUMP_SYSCTL="kernel.panic_on_oops=1" KDUMP_COREDIR="/var/crash" KDUMP_FAIL_CMD="reboot -f" DEBUG_KERNEL=/usr/lib/debug/boot/vmlinux-4.9.0-6-amd64 MAKEDUMP_ARGS="-c -d 17 # cat /etc/sysctl.conf # # /etc/sysctl.conf - Configuration file for setting system variables # See /etc/sysctl.d/ for additonal system variables # See sysctl.conf (5) for information. # fs.file-max = 2097152 net.core.somaxconn = 10000 net.core.rmem_max = 1048576 net.core.wmem_max = 16777216 net.ipv4.tcp_fin_timeout = 1 net.ipv4.tcp_keepalive_time = 1800 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.ipv4.tcp_syncookies = 1 net.ipv4.ip_local_port_range = 31000 65535 vm.swappiness = 0 kernel.core_pattern = /tmp/core.%e.%p.%h.%t kernel.core_uses_pid = 1 net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 vm.dirty_bytes = 536870912 vm.dirty_background_bytes = 268435456 net.netfilter.nf_conntrack_max = 12621440 net.nf_conntrack_max = 12621440 net.ipv4.netfilter.ip_conntrack_generic_timeout = 120 net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 120 net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_tw_reuse = 0 net.ipv4.tcp_window_scaling = 1 kernel.shmmax = 40802189312 kernel.shmall = 9961473 vm.zone_reclaim_mode = 0 vm.min_free_kbytes = 524288 net.core.wmem_default = 65536 net.core.rmem_default = 1048576 net.core.netdev_max_backlog = 50000 net.ipv4.tcp_low_latency = 1 net.ipv4.tcp_congestion_control = htcp net.ipv6.conf.eth0.disable_ipv6 = 1 # KERNEL PANIC OPTIONS kernel.panic = 1 kernel.hung_task_panic = 1 kernel.panic_on_io_nmi = 1 kernel.panic_on_oops = 1 kernel.panic_on_unrecovered_nmi = 1 kernel.softlockup_panic = 1 Of course, kdump-tools is running. Additional information: # dmesg | grep "Reserving" [ 0.000000] Reserving 512MB of memory at 336MB for crashkernel (System RAM: 130958MB) # cat /proc/cmdline BOOT_IMAGE=/vmlinuz-4.9.0-6-amd64 root=/dev/mapper/system-root ro nomodeset net.ifnames=0 biosdevname=0 consoleblank=0 rootdelay=120 transparent_hugepage=never quiet crashkernel=512M (yes, server have 128 GB RAM) # cat /sys/kernel/kexec_crash_loaded 1 The packages kdump-tools linux-image-dbg crash kexec-tools makedumpfile is installed too. What is I'm missing? --- With best regards, Eugene Budanov.
