just to give you another sample: running stress-ng in ssh session: stress-ng --opcode 1 --timeout 60 --metrics-brief get the following on the console: [ 813.208349] Kernel unaligned access at TPC[4cf720] lock_acquire+0x100/0x200 [ 813.208378] Unable to handle kernel paging request in mna handler [ 813.208419] at virtual address 794b00a7d6fbfb37 [ 813.208460] current->{active_,}mm->context = 0000000000001774 [ 813.208483] current->{active_,}mm->pgd = fff800004a6cc000 [ 813.208506] \|/ ____ \|/ [ 813.208506] "@'/ .. \`@" [ 813.208506] /_| \__/ |_\ [ 813.208506] \__U_/ [ 813.208555] stress-ng-opcod(5955): Oops [#1] [ 813.208577] CPU: 0 PID: 5955 Comm: stress-ng-opcod Tainted: G E 5.11.0-rc1-00073-g3516bd729358 #173 [ 813.208618] TSTATE: 0000000080e01602 TPC: 00000000004cf720 TNPC: 00000000004cf724 Y: 00000000 Tainted: G E [ 813.208659] TPC: <lock_acquire+0x100/0x200> [ 813.208680] g0: 0000000000000000 g1: 0000000000000001 g2: 0000000000004023 g3: 0000000001502400 [ 813.208712] g4: fff800004a9faf80 g5: 794b00a7d5ede977 g6: fff800004071c000 g7: 00000000ffffffff [ 813.208744] o0: 0000000000000007 o1: 0000000000dd6070 o2: fff800004058bb30 o3: 0000000000000000 [ 813.208779] o4: 0000000000000034 o5: 000000000000000b sp: fff800004058aaf1 ret_pc: 000000000042aa84 [ 813.208812] RPC: <sun4v_do_mna+0x24/0xa0> [ 813.208836] l0: 00000000010e11c0 l1: 0000000000edbc78 l2: 000000000048f2c0 l3: 0000000000000020 [ 813.208869] l4: 794b00a7d6fbfb37 l5: 00000000000e0000 l6: fff800004071c000 l7: 0000000080001002 [ 813.208901] i0: 0000000000f737a8 i1: 0000000000000000 i2: 0000000000000000 i3: 0000000000000002 [ 813.208933] i4: 00000000010e11c0 i5: 0000000000000000 i6: fff800004058abc1 i7: 000000000048f2f0 [ 813.208966] I7: <atomic_notifier_call_chain+0x30/0xc0> [ 813.208993] Call Trace: [ 813.209008] Disabling lock debugging due to kernel taint [ 813.209016] Instruction DUMP: [ 813.209019] 21004384 [ 813.209025] a01421c0 [ 813.209031] b8100010 [ 813.209037] <c2070005> [ 813.209043] 80a06000 [ 813.209049] 1240001d [ 813.209054] 01000000 [ 813.209060] c2012874 [ 813.209065] 80a06000 [ 813.209071] [ 813.209142] CPU[0]: Args were cnt(1) cpulist_pa(34c4a000) mondo_block_pa(3040d680) [ 813.209160] Kernel panic - not syncing: Unexpected SUN4V mondo error 6 [ 813.210744] sun4v_cpu_stop() failed err=6 [ 813.211316] Press Stop-A (L1-A) from sun keyboard or send break [ 813.211316] twice on console to return to the boot prom [ 813.211327] ---[ end Kernel panic - not syncing: Unexpected SUN4V mondo error 6 ]---