Hi I'm increasing dmesg buffer size at runtime by passing log_buf_len=1M (or 512K) at command line. At compile time, I have LOG_BUF_LEN as 256K. However, when this kernel crashes (crashkernel set at 64M), vmcore-dmesg fails with below error. No program header covering vaddr 0xffff88013ff00000found kexec bug? Am I missing something here? Thank you. Here are some debugs I added to kernel. This is with 3.4 kernel and I've tried with kexec-tools-2.0.4. [ 0.000000] log_buf_len_setup: log_buf_len 262144 new 1048576 ffffffff8170b140 [ 0.000000] setup_log_buf: early 1 262144 new_log_buf_len 1048576 [ 0.000000] log_buf_len: 1048576 ffff880037d58000 [ 0.000000] early log buf free: 258671(98%) [ 0.000000] setup_log_buf: early 0 1048576 new_log_buf_len 0 [ 0.503752] log_buf_kexec_setup: lbl 1048576 new 0 ffffffff816198c4 logbuf ffff880037d58000 In kdump, running vmcore_dmesg /proc/vmcore No program header covering vaddr 0xffff88013ff00000found kexec bug?
