Date: Mon, 09 May 2022 00:19:26 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263824 --- Comment #4 from Jiahao LI <firstname.lastname@example.org> --- (In reply to Mike Karels from comment #3) Hi, Happy to hear that the problem can be fixed. I cannot reproduce the problem in the current release of the Freebsd image but I never try to change any parameter in "sysctl". This problem happens in my own development environment. My development environment is not entirely based on the Freebsd, but Freebsd is running within our development environment and the version of Freebsd is not based on the current release. hw.genet.tx_hdr_min does not exist in the Freebsd running in my development environment. I can provide further details to help reproduce this issue. Let's say we want to send a large packet, e.x. "ping -s 2048 ....", and the packet is going to fragmented at the network layer, IP layer. For the first fragmented packet, the network header, ICMP header and a portion of payload are stored in one mbuf, and "M_EXT" macro is set at that mbuf based on the rule in the code. Therefore, the mbuf is not writeable. The link-layer header and statusblock will be prepended to a new mbuf inserted before the mbuf carrying the "network header + ICMP header + payload". For reproducing the problem, it might not be necessary to send a large packet, but just make the mbuf not writable. -- You are receiving this mail because: You are on the CC list for the bug.