This patch set introduces -s option for log builtin command to display printk safe buffers (safe_print_seq/nmi_print_seq) as follows: === crash> log -s PRINTK_SAFE_SEQ_BUF: nmi_print_seq CPU: 0 ADDR: ffff969d7bc19ce0 LEN: 150 MESSAGE_LOST: 0 Uhhuh. NMI received for unknown reason 20 on CPU 0. Do you have a strange power saving mode enabled? Dazed and confused, but trying to continue ... === The printk safe buffers are also displayed at the bottom of 'log' output so as not to overlook them. === crash> log ... [nmi_print_seq] Uhhuh. NMI received for unknown reason 20 on CPU 0. [nmi_print_seq] Do you have a strange power saving mode enabled? [nmi_print_seq] Dazed and confused, but trying to continue === -m and -t options are also supported. Note that the safe buffer (struct printk_safe_seq_buf) was introduced in kernel-4.11 (Merge commit 7d91de74436a69c2b78a7a72f1e7f97f8b4396fa) and removed in kernel-5.15 (93d102f094be9beab28e5afb656c188b16a3793b). Changes since v2: - Add support new options -s, -t, -m (Kazu) - Add help text (Kazu) [v1]: https://listman.redhat.com/archives/crash-utility/2021-December/msg00031.html [v2]: https://listman.redhat.com/archives/crash-utility/2022-January/msg00004.html Test program is attached in the above v2 patch e-mail. Shogo Matsumoto (7): log: introduce -s option log: adjust indent and line breaks for log -s log: append printk safe buffer output to 'log' log: add support -t option for output of printk safe buffers log: add support -m for output of printk safe buffers symbols: add support 'help -o' for printk safe buffers log: add help text for printk safe buffers defs.h | 5 ++ help.c | 25 ++++++++- kernel.c | 159 +++++++++++++++++++++++++++++++++++++++++++++++++++++- symbols.c | 5 ++ 4 files changed, 192 insertions(+), 2 deletions(-) -- 2.29.2 -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/crash-utility
