mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-03-07 16:46:01 +07:00
60f1bf29c0
When calling smp_call_ipl_cpu() from the IPL CPU, we will try to read
from pcpu_devices->lowcore. However, due to prefixing, that will result
in reading from absolute address 0 on that CPU. We have to go via the
actual lowcore instead.
This means that right now, we will read lc->nodat_stack == 0 and
therfore work on a very wrong stack.
This BUG essentially broke rebooting under QEMU TCG (which will report
a low address protection exception). And checking under KVM, it is
also broken under KVM. With 1 VCPU it can be easily triggered.
:/# echo 1 > /proc/sys/kernel/sysrq
:/# echo b > /proc/sysrq-trigger
[ 28.476745] sysrq: SysRq : Resetting
[ 28.476793] Kernel stack overflow.
[ 28.476817] CPU: 0 PID: 424 Comm: sh Not tainted 5.0.0-rc1+ #13
[ 28.476820] Hardware name: IBM 2964 NE1 716 (KVM/Linux)
[ 28.476826] Krnl PSW : 0400c00180000000 0000000000115c0c (pcpu_delegate+0x12c/0x140)
[ 28.476861] R:0 T:1 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
[ 28.476863] Krnl GPRS: ffffffffffffffff 0000000000000000 000000000010dff8 0000000000000000
[ 28.476864] 0000000000000000 0000000000000000 0000000000ab7090 000003e0006efbf0
[ 28.476864] 000000000010dff8 0000000000000000 0000000000000000 0000000000000000
[ 28.476865] 000000007fffc000 0000000000730408 000003e0006efc58 0000000000000000
[ 28.476887] Krnl Code: 0000000000115bfe: 4170f000 la %r7,0(%r15)
[ 28.476887] 0000000000115c02: 41f0a000 la %r15,0(%r10)
[ 28.476887] #0000000000115c06: e370f0980024 stg %r7,152(%r15)
[ 28.476887] >0000000000115c0c: c0e5fffff86e brasl %r14,114ce8
[ 28.476887] 0000000000115c12: 41f07000 la %r15,0(%r7)
[ 28.476887] 0000000000115c16: a7f4ffa8 brc 15,115b66
[ 28.476887] 0000000000115c1a: 0707 bcr 0,%r7
[ 28.476887] 0000000000115c1c: 0707 bcr 0,%r7
[ 28.476901] Call Trace:
[ 28.476902] Last Breaking-Event-Address:
[ 28.476920] [<0000000000a01c4a>] arch_call_rest_init+0x22/0x80
[ 28.476927] Kernel panic - not syncing: Corrupt kernel stack, can't continue.
[ 28.476930] CPU: 0 PID: 424 Comm: sh Not tainted 5.0.0-rc1+ #13
[ 28.476932] Hardware name: IBM 2964 NE1 716 (KVM/Linux)
[ 28.476932] Call Trace:
Fixes:
|
||
|---|---|---|
| .. | ||
| syscalls | ||
| vdso32 | ||
| vdso64 | ||
| .gitignore | ||
| alternative.c | ||
| asm-offsets.c | ||
| audit.c | ||
| audit.h | ||
| base.S | ||
| cache.c | ||
| compat_audit.c | ||
| compat_linux.c | ||
| compat_linux.h | ||
| compat_ptrace.h | ||
| compat_signal.c | ||
| compat_wrapper.c | ||
| cpcmd.c | ||
| crash_dump.c | ||
| debug.c | ||
| diag.c | ||
| dis.c | ||
| dumpstack.c | ||
| early_nobss.c | ||
| early_printk.c | ||
| early.c | ||
| ebcdic.c | ||
| entry.h | ||
| entry.S | ||
| fpu.c | ||
| ftrace.c | ||
| guarded_storage.c | ||
| head64.S | ||
| idle.c | ||
| ipl_vmparm.c | ||
| ipl.c | ||
| irq.c | ||
| jump_label.c | ||
| kdebugfs.c | ||
| kexec_elf.c | ||
| kexec_image.c | ||
| kprobes.c | ||
| lgr.c | ||
| machine_kexec_file.c | ||
| machine_kexec.c | ||
| Makefile | ||
| mcount.S | ||
| module.c | ||
| nmi.c | ||
| nospec-branch.c | ||
| nospec-sysfs.c | ||
| os_info.c | ||
| perf_cpum_cf_events.c | ||
| perf_cpum_cf.c | ||
| perf_cpum_sf.c | ||
| perf_event.c | ||
| perf_regs.c | ||
| pgm_check.S | ||
| process.c | ||
| processor.c | ||
| ptrace.c | ||
| reipl.S | ||
| relocate_kernel.S | ||
| runtime_instr.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| stacktrace.c | ||
| sthyi.c | ||
| suspend.c | ||
| swsusp.S | ||
| sys_s390.c | ||
| sysinfo.c | ||
| time.c | ||
| topology.c | ||
| trace.c | ||
| traps.c | ||
| uprobes.c | ||
| vdso.c | ||
| vmlinux.lds.S | ||
| vtime.c | ||