Messages in this thread | | | Subject | Re: [PATCH] powerpc/kdump: fix kdump kernel hangup issue with hot add CPUs | From | Hari Bathini <> | Date | Fri, 16 Apr 2021 15:03:38 +0530 |
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On 16/04/21 12:17 pm, Sourabh Jain wrote: > With the kexec_file_load system call when system crashes on the hot add > CPU the capture kernel hangs and failed to collect the vmcore. > > Kernel panic - not syncing: sysrq triggered crash > CPU: 24 PID: 6065 Comm: echo Kdump: loaded Not tainted 5.12.0-rc5upstream #54 > Call Trace: > [c0000000e590fac0] [c0000000007b2400] dump_stack+0xc4/0x114 (unreliable) > [c0000000e590fb00] [c000000000145290] panic+0x16c/0x41c > [c0000000e590fba0] [c0000000008892e0] sysrq_handle_crash+0x30/0x40 > [c0000000e590fc00] [c000000000889cdc] __handle_sysrq+0xcc/0x1f0 > [c0000000e590fca0] [c00000000088a538] write_sysrq_trigger+0xd8/0x178 > [c0000000e590fce0] [c0000000005e9b7c] proc_reg_write+0x10c/0x1b0 > [c0000000e590fd10] [c0000000004f26d0] vfs_write+0xf0/0x330 > [c0000000e590fd60] [c0000000004f2aec] ksys_write+0x7c/0x140 > [c0000000e590fdb0] [c000000000031ee0] system_call_exception+0x150/0x290 > [c0000000e590fe10] [c00000000000ca5c] system_call_common+0xec/0x278 > --- interrupt: c00 at 0x7fff905b9664 > NIP: 00007fff905b9664 LR: 00007fff905320c4 CTR: 0000000000000000 > REGS: c0000000e590fe80 TRAP: 0c00 Not tainted (5.12.0-rc5upstream) > MSR: 800000000280f033 <SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 28000242 > XER: 00000000 > IRQMASK: 0 > GPR00: 0000000000000004 00007ffff5fedf30 00007fff906a7300 0000000000000001 > GPR04: 000001002a7355b0 0000000000000002 0000000000000001 00007ffff5fef616 > GPR08: 0000000000000001 0000000000000000 0000000000000000 0000000000000000 > GPR12: 0000000000000000 00007fff9073a160 0000000000000000 0000000000000000 > GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > GPR20: 0000000000000000 00007fff906a4ee0 0000000000000002 0000000000000001 > GPR24: 00007fff906a0898 0000000000000000 0000000000000002 000001002a7355b0 > GPR28: 0000000000000002 00007fff906a1790 000001002a7355b0 0000000000000002 > NIP [00007fff905b9664] 0x7fff905b9664 > LR [00007fff905320c4] 0x7fff905320c4 > --- interrupt: c00
<SNIP>
> /** > * setup_new_fdt_ppc64 - Update the flattend device-tree of the kernel > * being loaded. > @@ -1020,6 +1113,13 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, > } > } > > + /* Update cpus nodes information to account hotplug CPUs. */ > + if (image->type == KEXEC_TYPE_CRASH) {
Shouldn't this apply to regular kexec_file_load case as well? Yeah, there won't be a hang in regular kexec_file_load case but for correctness, that kernel should also not see stale CPU info in FDT?
Thanks Hari
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