Re: [Crash-utility] [PATCH] ppc64: fix crash load failure

On Thu, Jun 8, 2023 at 5:02 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com&gt; wrote: > On 2023/06/08 13:31, Lianbo Jiang wrote: > > Crash tool will fail to load vmcore with the following error: > > > > #crash vmlinux /var/crash/127.0.0.1-2023-06-07-22\:03\:24/vmcore -s > > crash: invalid structure size: note_buf > > FILE: diskdump.c LINE: 121 FUNCTION: have_crash_notes() > > > > [./crash] error trace: 101859ac => 10291798 => 10291450 => 10266038 > > > > 10266038: SIZE_verify+156 > > 10291450: have_crash_notes+308 > > 10291798: map_cpus_to_prstatus_kdump_cmprs+448 > > 101859ac: task_init+11980 > > > > The reason is that the note_buf is not intialized before using the > > SIZE(note_buf) in the have_crash_notes(). Let's initialize the variable > > note_buf in the ppc64_init() to fix this issue. > > Thanks for the patch. > > Most of the architectures already have it, but some still do not have, I don't have a 4 cpus s390x machine on hand, and am still trying to find it.

> > e.g. is s390x ok? It might be better to put it in task_init() because It was initialized in the machdep_init(POST_GDB), see the following code: ... read_in_kernel_config(IKCFG_INIT); kernel_init(); machdep_init(POST_GDB); <--- vm_init(); machdep_init(POST_VM); module_init(); help_init(); task_init(); vfs_init(); net_init(); dev_init(); machdep_init(POST_INIT); ... I would suggest putting it at the end of the kernel_init(), so that the original initialization order will basically not be changed > it's used there? > Do you mean we need to move the existing initialization(all) to the task_init()? > > $ git grep 'STRUCT_SIZE_INIT(note_buf' > arm.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > arm64.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > mips.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > mips64.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > ppc.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > riscv64.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > x86.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > x86_64.c: STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > xen_hyper.c: XEN_HYPER_STRUCT_SIZE_INIT(note_buf_t, "note_buf_t"); > > Thanks, > Kazu > > > > > Fixes: db8c030857b4 ("diskdump/netdump: fix segmentation fault caused > by failure of stopping CPUs") > > Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt; > > --- > > ppc64.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/ppc64.c b/ppc64.c > > index b95a621d8fe4..ff7f0fca3a95 100644 > > --- a/ppc64.c > > +++ b/ppc64.c > > @@ -695,6 +695,7 @@ ppc64_init(int when) > > } > > > > ppc64_init_paca_info(); > > + STRUCT_SIZE_INIT(note_buf, "note_buf_t"); > > > > if (!machdep->hz) { > > machdep->hz = HZ;