I was going to tell you that I'd successfully booted and run 5.15.7-rt23 on my Honeycomb board, but after talking with Andrew realized that I wasn't going through the same code paths on boot (Honeycomb is uefi/acpi, your board is DT). Glad Andrew's suggestion works for you. I might suggest you taking the changes built on top of 5.15.7-rt23 and try rebasing them onto the head of the v5.15-rt stable tree, which should be v5.15.71-rt51. Lots of fixes available there Clark On Tue, Oct 4, 2022 at 4:00 PM Brian Wrenn <dcbrianw@xxxxxxxxx> wrote: > > Hi Andrew, > > thank you for the suggestion. I tried that. The devboard boots into > the PREEMPT-RT kernel. I've still got some other problems to resolve, > but those seem to be rooted elsewhere. > > -Brian > > On Mon, Oct 3, 2022 at 4:10 PM Andrew Halaney <ahalaney@xxxxxxxxxx> wrote: > > > > Hey Brian, > > > > On Fri, Sep 30, 2022 at 11:43:11AM -0400, Brian Wrenn wrote: > > > Hi, > > > > > > I am building a kernel from source derived from Linaro 21.12, based on > > > linux kernel 5.15.7. It runs on a Variscite DART SD410 dev board. > > > When I build that kernel, it will boots successfully. When I build > > > the same kernel source with the PREEMPT-RT patch, it aborts during > > > boot. I attached console output for each case. > > > > > > An incompatibility between the Variscite patches and PREEMPT-RT could > > > cause this abort, but just to cover all my bases, I'm try to rule out > > > the PREEMPT-RT patch itself. > > > > > > The call trace includes RT specific routines, so I'm wondering if > > > there are any known problems with routines in this call state, and if > > > any fix for them exists in some way applicable to the v23 patch. > > > > I've seen these backtraces before, but unfortunately don't have a proper > > fix to point you to. > > > > > Format: Log Type - Time(microsec) - Message - Optional Info > > > Log Type: B - Since Boot(Power On Reset), D - Delta, S - Statistic > > > S - QC_IMAGE_VERSION_STRING=BOOT.BF.3.0-00288 > > > S - IMAGE_VARIANT_STRING=HAAAANAZA > > > S - OEM_IMAGE_VERSION_STRING=CRM > > > S - Boot Config, 0x000002e3 > > <snip>.. > > > [ 0.882843] BUG: scheduling while atomic: swapper/2/0/0x00000002 > > > [ 0.882858] Modules linked in: > > > [ 0.882867] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.15.7-qcomlt-arm64 #3 > > > [ 0.882876] Hardware name: Variscite LTD. VAR-DART410 HDMI (DT) > > > [ 0.882881] Call trace: > > > [ 0.882883] dump_backtrace+0x0/0x1e8 > > > [ 0.882902] show_stack+0x18/0x28 > > > [ 0.882911] dump_stack_lvl+0x68/0x84 > > > [ 0.882922] dump_stack+0x18/0x34 > > > [ 0.882941] __schedule_bug+0x54/0x78 > > > [ 0.882958] __schedule+0x730/0x838 > > > [ 0.882972] schedule_rtlock+0x28/0x58 > > > [ 0.882986] rtlock_slowlock_locked+0x228/0xcc8 > > > [ 0.882998] rt_spin_lock+0x7c/0xa8 > > > [ 0.883013] genpd_lock_nested_spin+0x1c/0x30 > > > [ 0.883030] genpd_power_off+0x18c/0x278 > > > [ 0.883045] genpd_runtime_suspend+0x1ec/0x300 > > > [ 0.883062] __rpm_callback+0x44/0x130 > > > [ 0.883077] rpm_callback+0x6c/0x78 > > > [ 0.883094] rpm_suspend+0xdc/0x470 > > > [ 0.883105] __pm_runtime_suspend+0x5c/0xa8 > > > [ 0.883121] __psci_enter_domain_idle_state.isra.5+0x54/0xe0 > > > [ 0.883139] psci_enter_domain_idle_state+0x18/0x28 > > > [ 0.883153] cpuidle_enter_state+0x25c/0x300 > > > [ 0.883170] cpuidle_enter+0x3c/0x58 > > > [ 0.883179] call_cpuidle+0x30/0x58 > > > [ 0.883188] do_idle+0x248/0x2a0 > > > [ 0.883195] cpu_startup_entry+0x24/0x70 > > > [ 0.883203] secondary_start_kernel+0x1b8/0x1e8 > > > [ 0.883212] __secondary_switched+0x90/0x94 > > > [ 0.883227] bad: scheduling from the idle thread! > > > [ 0.883231] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G W 5.15.7-qcomlt-arm64 #3 > > > [ 0.883239] Hardware name: Variscite LTD. VAR-DART410 HDMI (DT) > > > [ 0.883243] Call trace: > > > [ 0.883244] dump_backtrace+0x0/0x1e8 > > > [ 0.883254] show_stack+0x18/0x28 > > > [ 0.883262] dump_stack_lvl+0x68/0x84 > > > [ 0.883272] dump_stack+0x18/0x34 > > > [ 0.883281] dequeue_task_idle+0x30/0x60 > > > [ 0.883290] __do_set_cpus_allowed+0x108/0x1e0 > > > [ 0.883299] __schedule+0x778/0x838 > > > [ 0.883305] schedule_rtlock+0x28/0x58 > > > [ 0.883311] rtlock_slowlock_locked+0x228/0xcc8 > > > [ 0.883319] rt_spin_lock+0x7c/0xa8 > > > [ 0.883326] genpd_lock_nested_spin+0x1c/0x30 > > > [ 0.883333] genpd_power_off+0x18c/0x278 > > > [ 0.883340] genpd_runtime_suspend+0x1ec/0x300 > > > [ 0.883348] __rpm_callback+0x44/0x130 > > > [ 0.883357] rpm_callback+0x6c/0x78 > > > [ 0.883364] rpm_suspend+0xdc/0x470 > > > [ 0.883371] __pm_runtime_suspend+0x5c/0xa8 > > > [ 0.883379] __psci_enter_domain_idle_state.isra.5+0x54/0xe0 > > > [ 0.883388] psci_enter_domain_idle_state+0x18/0x28 > > > [ 0.883395] cpuidle_enter_state+0x25c/0x300 > > > [ 0.883401] cpuidle_enter+0x3c/0x58 > > > [ 0.883408] call_cpuidle+0x30/0x58 > > > [ 0.883420] do_idle+0x248/0x2a0 > > > [ 0.883437] cpu_startup_entry+0x24/0x70 > > > [ 0.883449] secondary_start_kernel+0x1b8/0x1e8 > > > [ 0.883458] __secondary_switched+0x90/0x94 > > > [ 0.883470] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 > > > [ 0.883475] Mem abort info: > > > [ 0.883476] ESR = 0x86000006 > > > [ 0.883480] EC = 0x21: IABT (current EL), IL = 32 bits > > > [ 0.883484] SET = 0, FnV = 0 > > > [ 0.883487] EA = 0, S1PTW = 0 > > > [ 0.883490] FSC = 0x06: level 2 translation fault > > > [ 0.883494] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000084c5b000 > > > [ 0.883499] [0000000000000000] pgd=080000008547a003, p4d=080000008547a003, pud=080000008547b003, pmd=0000000000000000 > > > [ 0.883513] Internal error: Oops: 86000006 [#1] PREEMPT_RT SMP > > > [ 0.883518] Modules linked in: > > > [ 0.883523] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G W 5.15.7-qcomlt-arm64 #3 > > > [ 0.883530] Hardware name: Variscite LTD. VAR-DART410 HDMI (DT) > > > [ 0.883534] pstate: 000000c5 (nzcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > > > [ 0.883542] pc : 0x0 > > > [ 0.883547] lr : __do_set_cpus_allowed+0x140/0x1e0 > > > [ 0.883558] sp : ffff800012573930 > > > [ 0.883560] x29: ffff800012573930 x28: ffff00000322d588 x27: 0080000000000000 > > > [ 0.883571] x26: ffff8000124bb000 x25: ffff000002960670 x24: ffff800011116528 > > > [ 0.883581] x23: ffff80001113ae50 x22: 0000000000000002 x21: ffff000002960000 > > > [ 0.883591] x20: ffff000002a10000 x19: ffff00003fc91580 x18: ffffffffffffffff > > > [ 0.883601] x17: 000000040044ffff x16: 00400032b5503510 x15: ffff8000119b0ea8 > > > [ 0.883611] x14: 0000000000000000 x13: ffff80001257335c x12: 656c646920656874 > > > [ 0.883621] x11: ffff800012573260 x10: 000000000000000a x9 : 00000000ffffffd0 > > > [ 0.883631] x8 : 000000000000000a x7 : 000000000000001e x6 : ffff8000121cbfb8 > > > [ 0.883641] x5 : ffff000002960a28 x4 : 0000000000000000 x3 : 0000000000000000 > > > [ 0.883650] x2 : 000000000000000a x1 : ffff000002960000 x0 : ffff00003fc91580 > > > [ 0.883661] Call trace: > > > [ 0.883663] 0x0 > > > [ 0.883668] __schedule+0x778/0x838 > > > [ 0.883676] schedule_rtlock+0x28/0x58 > > > [ 0.883685] rtlock_slowlock_locked+0x228/0xcc8 > > > [ 0.883693] rt_spin_lock+0x7c/0xa8 > > > [ 0.883706] genpd_lock_nested_spin+0x1c/0x30 > > > [ 0.883721] genpd_power_off+0x18c/0x278 > > > [ 0.883729] genpd_runtime_suspend+0x1ec/0x300 > > > [ 0.883736] __rpm_callback+0x44/0x130 > > > [ 0.883744] rpm_callback+0x6c/0x78 > > > [ 0.883751] rpm_suspend+0xdc/0x470 > > > [ 0.883759] __pm_runtime_suspend+0x5c/0xa8 > > > [ 0.883766] __psci_enter_domain_idle_state.isra.5+0x54/0xe0 > > > [ 0.883775] psci_enter_domain_idle_state+0x18/0x28 > > > [ 0.883783] cpuidle_enter_state+0x25c/0x300 > > > [ 0.883789] cpuidle_enter+0x3c/0x58 > > > [ 0.883795] call_cpuidle+0x30/0x58 > > > [ 0.883804] do_idle+0x248/0x2a0 > > > [ 0.883812] cpu_startup_entry+0x24/0x70 > > > [ 0.883820] secondary_start_kernel+0x1b8/0x1e8 > > > [ 0.883828] __secondary_switched+0x90/0x94 > > > [ 0.883843] Code: bad PC value > > > [ 0.883850] ---[ end trace 0000000000000002 ]--- > > > > Here's where Adrien poked at it a little: > > > > https://lore.kernel.org/all/20220615203605.1068453-1-athierry@xxxxxxxxxx/ > > > > As a dirty workaround you could disable CONFIG_ARM_PSCI_CPUIDLE in your > > config. > > > > Thanks, > > Andrew > > >
