https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277559
Bug ID: 277559
Summary: kldload vmm sometimes hangs kernel on arm64
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
On my RockPro64 "kldload vmm" sometimes hangs the system so hard I can't even
enter DDB with a break on the serial console. The smp_rendezvous call in
vmops_modinit appears to be the culprit according to some debugging printfs I
added.
printf("vmmops_modinit rendezvous %p {%lx, %lx}\n", &el2_regs,
el2_regs.tcr_el2, el2_regs.vtcr_el2);
pause("vmmon", 20); // let console output queue drain
smp_rendezvous(NULL, arm_setup_vectors, NULL, &el2_regs);
printf("vmmops_modinit rendezvous returned\n");
pause("vmmon", 20); // let console output queue drain
The last line on the console when it hangs is
vmmops_modinit rendezvous 0xffff0000a5b9d380 {80823510, 80023559}
The RockPro64 has 4 Cortex-A53 and 2 Cortex A-72 processors, same clock speed
but different performance.
According to other printfs I added to vmmops_modinit,
ID_AA64MMFR0_EL1 = 1122
vmm_virt_bits = 39
Most of the time the vmm module loads. About 10% of the time it hangs.
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