** Package changed: kexec-tools (Ubuntu) => kdump-tools (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to kexec-tools in Ubuntu. Matching subscriptions: Maintainer https://bugs.launchpad.net/bugs/1908090
Title: ubuntu 20.04 kdump fails Status in kdump-tools package in Ubuntu: Confirmed Bug description: When linux-crashdump (5.4.0.58.61) is enabled on Ubuntu 20.04 LTS, everything appears to be in good working order, according to "systemctl status kdump-tools" and "kdump-config status". However, upon an actual crash, the system hangs, and no crash files are produced. I've investigated and have learned that the capture kernel does indeed start, but it is unable to unpack the rootfs/initrd, and thus fails and hangs. [ 1.070469] Trying to unpack rootfs image as initramfs... [ 1.333182] swapper/0 invoked oom-killer: gfp_mask=0x100cc2(GFP_HIGHUSER), order=0, oom_score_adj=0 [ 1.335074] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-26-generic #30-Ubuntu [ 1.336396] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 [ 1.336396] Call Trace: [ 1.336396] dump_stack+0x6d/0x9a [ 1.336396] dump_header+0x4f/0x1eb [ 1.336396] out_of_memory.part.0.cold+0x39/0x83 [ 1.336396] out_of_memory+0x6d/0xd0 ... [ 1.413202] ---[ end Kernel panic - not syncing: System is deadlocked on memory ]--- On this system with 8G of memory, the crash memory as specified on the kernel command line is "crashkernel=512M-:192M". I changed the 192M to 256M, and now kdump works. Not sure how the 192M value is chosen, but it does not work. I think this used value used to work for 16.04 and maybe 18.04 (I didn't try), but is no longer useful for 20.04. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kdump-tools/+bug/1908090/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
