Re: [PATCH 0/3] ARM: dts: bcm2711-rpi-cm4-io: Enable xHCI host

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Hi Stefan,

Stefan Wahren <wahrenst@xxxxxxx> (2023-11-26):
> In contrast to the Raspberry Pi 4, the Compute Module 4 or the IO board
> does not have a VL805 USB 3.0 host controller, which is connected via
> PCIe. Instead, the BCM2711 on the Compute Module provides the built-in
> xHCI.
>
> Stefan Wahren (3):
>   dt-bindings: usb: xhci: Add optional power-domains
>   ARM: dts: bcm2711: Add generic xHCI
>   ARM: dts: bcm2711-rpi-cm4-io: Enable xHCI host
>
>  Documentation/devicetree/bindings/usb/generic-xhci.yaml | 3 +++
>  arch/arm/boot/dts/broadcom/bcm2711-rpi-cm4-io.dts       | 9 ++++++++-
>  arch/arm/boot/dts/broadcom/bcm2711-rpi.dtsi             | 5 +++++
>  arch/arm/boot/dts/broadcom/bcm2711.dtsi                 | 9 +++++++++
>  4 files changed, 25 insertions(+), 1 deletion(-)

I've tried applying this series on top of v6.6-15365-g305230142ae0 (the
base commit for Jim's v8 patch series regarding PCIe/clkreq[1]), since I
know the unpatched kernel is working fine with a CM4 Lite if there's no
PCIe hardware plugged in.

 1. https://lore.kernel.org/all/20231113185607.1756-1-james.quinlan@xxxxxxxxxxxx/

With those patches applied, on the following hardware setup:
 - CM4 Lite (and SD card)
 - CM4 IO Board
 - Ethernet
 - HDMI
 - Serial console

(But neither USB storage or USB keyboard.)

I'm seeing various failure modes, but basically the system no longer
boots. I'm a little short on time right now, but if the following
excerpts aren't sufficient I can adjust logging to capture a full
trace for one or more of those.

This seems like a showstopper on its own, but if you'd like me to try
with an eMMC-equipped CM4, I can do that as well.

    Loading, please wait...
    Starting systemd-udevd version 252.17-1~deb12u1
    [    3.009941] usb_phy_generic phy: dummy supplies not allowed for exclusive requests
    [    3.019538] usbcore: registered new interface driver usbfs
    [    3.025266] usbcore: registered new interface driver hub
    [    3.025695] sdhci: Secure Digital Host Controller Interface driver
    [    3.030748] usbcore: registered new device driver usb
    [    3.036984] sdhci: Copyright(c) Pierre Ossman
    [    3.057911] sdhci-pltfm: SDHCI platform and OF driver helper
    [    3.067167] sdhci-iproc fe300000.mmc: allocated mmc-pwrseq
    [    3.082634] xhci-hcd fe9c0000.usb: xHCI Host Controller
    [    3.088051] xhci-hcd fe9c0000.usb: new USB bus registered, assigned bus number 1
    [    3.112118] mmc1: SDHCI controller on fe300000.mmc [fe300000.mmc] using PIO
    [    3.119262] mmc0: SDHCI controller on fe340000.mmc [fe340000.mmc] using ADMA
    [   24.084102] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
    [   24.090107] rcu:     2-...0: (1 ticks this GP) idle=125c/1/0x4000000000000000 softirq=389/393 fqs=2454
    [   24.099283] rcu:     (detected by 3, t=5252 jiffies, g=-607, q=619 ncpus=4)
    [   24.106077] Sending NMI from CPU 3 to CPUs 2:
    [   24.220101] watchdog: Watchdog detected hard LOCKUP on cpu 1
    [   24.225837] Modules linked in: mdio_bcm_unimac sdhci_iproc of_mdio crct10dif_ce sdhci_pltfm crct10dif_common fixed_phy xhci_plat_hcd(+) reset_raspberrypi fwnode_mdio xhci_hcd libphy i2c_bcm2835 usbcore gpio_regulator phy_generic usb_common sdhci fixed
    [   34.111290] rcu: rcu_sched kthread timer wakeup didn't happen for 2504 jiffies! g-607 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
    [   34.122579] rcu:     Possible timer handling issue on cpu=3 timer-softirq=2120
    [   34.129634] rcu: rcu_sched kthread starved for 2510 jiffies! g-607 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=3
    [   34.139952] rcu:     Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
    [   34.149034] rcu: RCU grace-period kthread stack dump:
    [   34.154150] task:rcu_sched       state:I stack:0     pid:16    tgid:16    ppid:2      flags:0x00000008
    [   34.163591] Call trace:
    [   34.166063]  __switch_to+0xe8/0x130
    [   34.169607]  __schedule+0x398/0xd48
    [   34.173140]  schedule+0x30/0xf0
    [   34.176321]  schedule_timeout+0xa4/0x188
    [   34.180294]  rcu_gp_fqs_loop+0x128/0x488
    [   34.184268]  rcu_gp_kthread+0x134/0x188
    [   34.188151]  kthread+0xec/0xf8
    [   34.191250]  ret_from_fork+0x10/0x20
    [   34.194874] rcu: Stack dump where RCU GP kthread last ran:
    [   34.200431] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.6.0+ #1
    [   34.206430] Hardware name: Raspberry Pi Compute Module 4 Rev 1.0 (DT)
    [   34.212956] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [   34.220013] pc : default_idle_call+0x54/0x100
    [   34.224427] lr : default_idle_call+0x40/0x100
    [   34.228841] sp : ffff8000800c3df0
    [   34.232193] x29: ffff8000800c3df0 x28: 0607f6804a328bb4 x27: 4f98c8ce00000000
    [   34.239431] x26: f01df0b7242a8fc6 x25: ffff0e8882a55140 x24: 0000000000000000
    [   34.246668] x23: 0000000000000000 x22: ffff0e8882a55140 x21: ffffcb7db4cdeb38
    [   34.253904] x20: 0000000000000003 x19: ffffcb7db477b008 x18: 0000000000000000
    [   34.261140] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
    [   34.268376] x14: ffffffffffffffff x13: 0000000000000444 x12: ffffcb7db4cdeb40
    [   34.275613] x11: 0000000000000001 x10: 0000000000000bb0 x9 : ffffcb7db2f88cf0
    [   34.282848] x8 : ffff0e8882a55d50 x7 : 0000000000000000 x6 : 000000004f24a986
    [   34.290085] x5 : 4000000000000000 x4 : ffff430b02a2a000 x3 : ffff430b02a2a000
    [   34.297321] x2 : 0000000000000001 x1 : ffff430b02a2a000 x0 : ffffcb7db477b008
    [   34.304557] Call trace:
    [   34.307029]  default_idle_call+0x54/0x100
    [   34.311089]  do_idle+0x218/0x278
    [   34.314359]  cpu_startup_entry+0x3c/0x50
    [   34.318330]  secondary_start_kernel+0x130/0x158
    [   34.322926]  __secondary_switched+0xb8/0xc0

or:

    Loading, please wait...
    Starting systemd-udevd version 252.17-1~deb12u1
    [    2.994822] usb_phy_generic phy: dummy supplies not allowed for exclusive requests
    [    3.003002] sdhci: Secure Digital Host Controller Interface driver
    [    3.009319] sdhci: Copyright(c) Pierre Ossman
    [    3.016194] usbcore: registered new interface driver usbfs
    [    3.021950] usbcore: registered new interface driver hub
    [    3.027475] usbcore: registered new device driver usb
    [    3.028573] sdhci-pltfm: SDHCI platform and OF driver helper
    [    3.048856] sdhci-iproc fe300000.mmc: allocated mmc-pwrseq
    [    3.071825] xhci-hcd fe9c0000.usb: xHCI Host Controller
    [    3.077211] xhci-hcd fe9c0000.usb: new USB bus registered, assigned bus number 1
    [    3.107780] mmc0: SDHCI controller on fe300000.mmc [fe300000.mmc] using PIO
    [    3.112158] mmc1: SDHCI controller on fe340000.mmc [fe340000.mmc] using ADMA
    [   13.192071] mmc0: Timeout waiting for hardware cmd interrupt.
    [   13.197899] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
    [   13.204426] mmc0: sdhci: Sys addr:  0x00000000 | Version:  0x00009902
    [   13.210953] mmc0: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
    [   13.217479] mmc0: sdhci: Argument:  0x00000c00 | Trn mode: 0x00000000
    [   13.224007] mmc0: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
    [   13.230532] mmc0: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    [   13.237059] mmc0: sdhci: Wake-up:   0x00000000 | Clock:    0x00003947
    [   13.243585] mmc0: sdhci: Timeout:   0x00000000 | Int stat: 0x00018000
    [   13.250112] mmc0: sdhci: Int enab:  0x00ff0003 | Sig enab: 0x00ff0003
    [   13.256638] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
    [   13.263163] mmc0: sdhci: Caps:      0x00000000 | Caps_1:   0x00000000
    [   13.269690] mmc0: sdhci: Cmd:       0x0000341a | Max curr: 0x00000001
    [   13.276215] mmc0: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
    [   13.282741] mmc0: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
    [   13.289267] mmc0: sdhci: Host ctl2: 0x00000000
    [   13.293766] mmc0: sdhci: ============================================
    [   23.436070] mmc0: Timeout waiting for hardware cmd interrupt.
    [   23.441896] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
    [   23.448423] mmc0: sdhci: Sys addr:  0x00000000 | Version:  0x00009902
    [   23.454949] mmc0: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
    [   23.461476] mmc0: sdhci: Argument:  0x80000c08 | Trn mode: 0x00000000
    [   23.468002] mmc0: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
    [   23.474528] mmc0: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    [   23.481054] mmc0: sdhci: Wake-up:   0x00000000 | Clock:    0x00003947
    [   23.487579] mmc0: sdhci: Timeout:   0x00000000 | Int stat: 0x00018000
    [   23.494106] mmc0: sdhci: Int enab:  0x00ff0003 | Sig enab: 0x00ff0003
    [   23.500632] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
    [   23.507158] mmc0: sdhci: Caps:      0x00000000 | Caps_1:   0x00000000
    [   23.513684] mmc0: sdhci: Cmd:       0x0000341a | Max curr: 0x00000001
    [   23.520209] mmc0: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
    [   23.526736] mmc0: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
    [   23.533262] mmc0: sdhci: Host ctl2: 0x00000000
    [   23.537760] mmc0: sdhci: ============================================
    [   24.100068] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
    [   24.106072] rcu:     1-...!: (0 ticks this GP) idle=177c/1/0x4000000000000000 softirq=266/266 fqs=0
    [   24.114984] rcu:     3-...!: (0 ticks this GP) idle=1094/1/0x4000000000000000 softirq=163/163 fqs=0
    [   24.123894] rcu:     (detected by 2, t=5254 jiffies, g=-579, q=440 ncpus=4)
    [   24.130689] Sending NMI from CPU 2 to CPUs 1:
    [   34.135902] Sending NMI from CPU 2 to CPUs 3:
    [   44.141138] rcu: rcu_sched kthread timer wakeup didn't happen for 5253 jiffies! g-579 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
    [   44.152427] rcu:     Possible timer handling issue on cpu=3 timer-softirq=87
    [   44.159306] rcu: rcu_sched kthread starved for 5254 jiffies! g-579 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=3
    [   44.169624] rcu:     Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
    [   44.178705] rcu: RCU grace-period kthread stack dump:
    [   44.183820] task:rcu_sched       state:I stack:0     pid:16    tgid:16    ppid:2      flags:0x00000008
    [   44.193264] Call trace:
    [   44.195737]  __switch_to+0xe8/0x130
    [   44.199280]  __schedule+0x398/0xd48
    [   44.202813]  schedule+0x30/0xf0
    [   44.205994]  schedule_timeout+0xa4/0x188
    [   44.209967]  rcu_gp_fqs_loop+0x128/0x488
    [   44.213941]  rcu_gp_kthread+0x134/0x188
    [   44.217824]  kthread+0xec/0xf8
    [   44.220921]  ret_from_fork+0x10/0x20
    [   44.224559] watchdog: Watchdog detected hard LOCKUP on cpu 3
    [   44.230292] Modules linked in: crct10dif_ce reset_raspberrypi crct10dif_common fixed_phy sdhci_iproc xhci_plat_hcd(+) xhci_hcd fwnode_mdio i2c_bcm2835 sdhci_pltfm usbcore libphy sdhci usb_common phy_generic fixed gpio_regulator
    [   44.250781] Sending NMI from CPU 2 to CPUs 3:
    [   54.264077] mmc0: Timeout waiting for hardware cmd interrupt.
    [   54.269900] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
    [   54.276426] mmc0: sdhci: Sys addr:  0x00000000 | Version:  0x00009902
    [   54.282953] mmc0: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
    [   54.289480] mmc0: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000
    [   54.296007] mmc0: sdhci: Present:   0x01ff0000 | Host ctl: 0x00000001
    [   54.302532] mmc0: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    [   54.309059] mmc0: sdhci: Wake-up:   0x00000000 | Clock:    0x00003947
    [   54.315585] mmc0: sdhci: Timeout:   0x00000000 | Int stat: 0x00018001
    [   54.322111] mmc0: sdhci: Int enab:  0x00ff0003 | Sig enab: 0x00ff0003
    [   54.328637] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
    [   54.335162] mmc0: sdhci: Caps:      0x00000000 | Caps_1:   0x00000000
    [   54.341689] mmc0: sdhci: Cmd:       0x00000000 | Max curr: 0x00000001
    [   54.348215] mmc0: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
    [   54.354741] mmc0: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
    [   54.361267] mmc0: sdhci: Host ctl2: 0x00000000
    [   54.365766] mmc0: sdhci: ============================================

or:

    Loading, please wait...
    Starting systemd-udevd version 252.17-1~deb12u1
    [    2.973041] usb_phy_generic phy: dummy supplies not allowed for exclusive requests
    [    2.981351] sdhci: Secure Digital Host Controller Interface driver
    [    2.987775] sdhci: Copyright(c) Pierre Ossman
    [    3.000568] sdhci-pltfm: SDHCI platform and OF driver helper
    [    3.021527] sdhci-iproc fe300000.mmc: allocated mmc-pwrseq
    [    3.030308] usbcore: registered new interface driver usbfs
    [    3.036004] usbcore: registered new interface driver hub
    [    3.041518] usbcore: registered new device driver usb
    [    3.059120] mmc0: SDHCI controller on fe340000.mmc [fe340000.mmc] using ADMA
    [    3.066296] mmc1: SDHCI controller on fe300000.mmc [fe300000.mmc] using PIO
    [    3.081846] bcmgenet fd580000.ethernet: GENET 5.0 EPHY: 0x0000
    [    3.118407] xhci-hcd fe9c0000.usb: xHCI Host Controller
    [    3.123745] xhci-hcd fe9c0000.usb: new USB bus registered, assigned bus number 1
    [    4.172083] ------------[ cut here ]------------
    [    4.176768] Firmware transaction timeout
    [    4.176825] WARNING: CPU: 2 PID: 143 at drivers/firmware/raspberrypi.c:64 rpi_firmware_property_list+0x250/0x270
    [    4.191121] Modules linked in: xhci_plat_hcd(+) xhci_hcd genet(+) mdio_bcm_unimac crct10dif_ce reset_raspberrypi crct10dif_common of_mdio usbcore i2c_bcm2835 sdhci_iproc fixed_phy fwnode_mdio usb_common sdhci_pltfm libphy fixed gpio_regulator sdhci phy_generic
    [    4.214527] CPU: 2 PID: 143 Comm: kworker/2:2 Not tainted 6.6.0+ #1
    [    4.220880] Hardware name: Raspberry Pi Compute Module 4 Rev 1.0 (DT)
    [    4.227407] Workqueue: events_freezable mmc_rescan
    [    4.232266] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [    4.239323] pc : rpi_firmware_property_list+0x250/0x270
    [    4.244618] lr : rpi_firmware_property_list+0x250/0x270
    [    4.249913] sp : ffff80008024ba70
    [    4.253265] x29: ffff80008024ba70 x28: ffff4307837b9428 x27: ffff430782b56440
    [    4.260503] x26: 0000000000000009 x25: ffff80008135d008 x24: 0000000000001000
    [    4.267739] x23: ffff430784142860 x22: ffffd0cee050ba68 x21: 0000000000000014
    [    4.274976] x20: ffff430782b56400 x19: ffff80008135d000 x18: 0000000000000006
    [    4.282212] x17: 0000000000000020 x16: 0000000000000002 x15: ffff80008024b450
    [    4.289448] x14: 0000000000000000 x13: 74756f656d697420 x12: 6e6f69746361736e
    [    4.296684] x11: 00000000ffffefff x10: ffffd0cee035ee20 x9 : ffffd0cede52fc78
    [    4.303921] x8 : 0000000000017fe8 x7 : c0000000ffffefff x6 : 0000000000057fa8
    [    4.311157] x5 : 0000000000000fff x4 : 0000000000000000 x3 : 0000000000000000
    [    4.318393] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff430784188000
    [    4.325629] Call trace:
    [    4.328102]  rpi_firmware_property_list+0x250/0x270
    [    4.333044]  rpi_firmware_property+0x8c/0xe0
    [    4.337369]  rpi_exp_gpio_set+0x60/0xc0
    [    4.341260]  gpio_chip_set_multiple+0x5c/0xa8
    [    4.345675]  gpiod_set_array_value_complex+0x388/0x4b8
    [    4.350884]  gpiod_set_array_value_cansleep+0x34/0x50
    [    4.356003]  mmc_pwrseq_simple_set_gpios_value.isra.0+0x74/0xa8
    [    4.362006]  mmc_pwrseq_simple_post_power_on+0x28/0x60
    [    4.367213]  mmc_pwrseq_post_power_on+0x2c/0x48
    [    4.371802]  mmc_power_up.part.0+0x8c/0x170
    [    4.376038]  mmc_rescan+0x19c/0x360
    [    4.379570]  process_one_work+0x174/0x3b0
    [    4.383632]  worker_thread+0x230/0x458
    [    4.387427]  kthread+0xec/0xf8
    [    4.390523]  ret_from_fork+0x10/0x20
    [    4.394146] ---[ end trace 0000000000000000 ]---
    [    4.398838] raspberrypi-exp-gpio soc:firmware:gpio: Failed to set GPIO 1 state (-110 0)
    [    4.398838] raspberrypi-exp-gpio soc:firmware:gpio: Failed to set GPIO 1 state (-110 0)
    [   14.476073] mmc1: Timeout waiting for hardware cmd interrupt.
    [   14.481897] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
    [   14.488424] mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00009902
    [   14.494952] mmc1: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
    [   14.501478] mmc1: sdhci: Argument:  0x00000c00 | Trn mode: 0x00000000
    [   14.508005] mmc1: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
    [   14.514532] mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    [   14.521058] mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000a147
    [   14.527585] mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00018000
    [   14.534111] mmc1: sdhci: Int enab:  0x00ff0003 | Sig enab: 0x00ff0003
    [   14.540636] mmc1: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
    [   14.547162] mmc1: sdhci: Caps:      0x00000000 | Caps_1:   0x00000000
    [   14.553689] mmc1: sdhci: Cmd:       0x0000341a | Max curr: 0x00000001
    [   14.560215] mmc1: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
    [   14.566741] mmc1: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
    [   14.573268] mmc1: sdhci: Host ctl2: 0x00000000
    [   14.577767] mmc1: sdhci: ============================================
    [   24.132072] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
    [   24.138075] rcu:     0-...0: (1 ticks this GP) idle=1574/1/0x4000000000000000 softirq=245/245 fqs=1050
    [   24.147252] rcu:     3-...0: (0 ticks this GP) idle=0e04/1/0x4000000000000000 softirq=167/170 fqs=1050
    [   24.156426] rcu:     (detected by 1, t=5259 jiffies, g=-587, q=243 ncpus=4)
    [   24.163220] Sending NMI from CPU 1 to CPUs 0:
    [   24.224071] watchdog: Watchdog detected hard LOCKUP on cpu 3
    [   24.229806] Modules linked in: xhci_plat_hcd(+) xhci_hcd genet(+) mdio_bcm_unimac crct10dif_ce reset_raspberrypi crct10dif_common of_mdio usbcore i2c_bcm2835 sdhci_iproc fixed_phy fwnode_mdio usb_common sdhci_pltfm libphy fixed gpio_regulator sdhci phy_generic
    [   24.704075] mmc1: Timeout waiting for hardware cmd interrupt.
    [   24.709897] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
    [   24.716423] mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00009902
    [   24.722950] mmc1: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
    [   24.729476] mmc1: sdhci: Argument:  0x80000c08 | Trn mode: 0x00000000
    [   24.736002] mmc1: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
    [   24.742528] mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    [   24.749053] mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000a147
    [   24.755579] mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00018000
    [   24.762105] mmc1: sdhci: Int enab:  0x00ff0003 | Sig enab: 0x00ff0003
    [   24.768631] mmc1: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
    [   24.775157] mmc1: sdhci: Caps:      0x00000000 | Caps_1:   0x00000000
    [   24.781682] mmc1: sdhci: Cmd:       0x0000341a | Max curr: 0x00000001
    [   24.788208] mmc1: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
    [   24.794734] mmc1: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
    [   24.801259] mmc1: sdhci: Host ctl2: 0x00000000
    [   24.805757] mmc1: sdhci: ============================================
    [   34.168434] Sending NMI from CPU 1 to CPUs 3:
    [   44.173983] rcu: rcu_sched kthread timer wakeup didn't happen for 5013 jiffies! g-587 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
    [   44.185271] rcu:     Possible timer handling issue on cpu=1 timer-softirq=1166
    [   44.192326] rcu: rcu_sched kthread starved for 5019 jiffies! g-587 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
    [   44.202645] rcu:     Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
    [   44.211726] rcu: RCU grace-period kthread stack dump:
    [   44.216842] task:rcu_sched       state:I stack:0     pid:16    tgid:16    ppid:2      flags:0x00000008
    [   44.226283] Call trace:
    [   44.228755]  __switch_to+0xe8/0x130
    [   44.232296]  __schedule+0x398/0xd48
    [   44.235829]  schedule+0x30/0xf0
    [   44.239010]  schedule_timeout+0xa4/0x188
    [   44.242983]  rcu_gp_fqs_loop+0x128/0x488
    [   44.246957]  rcu_gp_kthread+0x134/0x188
    [   44.250841]  kthread+0xec/0xf8
    [   44.253934]  ret_from_fork+0x10/0x20
    [   44.257555] rcu: Stack dump where RCU GP kthread last ran:
    [   44.263111] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W          6.6.0+ #1
    [   44.270610] Hardware name: Raspberry Pi Compute Module 4 Rev 1.0 (DT)
    [   44.277135] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [   44.284192] pc : default_idle_call+0x54/0x100
    [   44.288606] lr : default_idle_call+0x40/0x100
    [   44.293019] sp : ffff8000800b3df0
    [   44.296373] x29: ffff8000800b3df0 x28: 1c7bdfbf00040000 x27: 2ffd2ffd00000002
    [   44.303610] x26: bd7e9f7e00400000 x25: ffff430782a50000 x24: 0000000000000000
    [   44.310847] x23: 0000000000000000 x22: ffff430782a50000 x21: ffffd0cee02deb38
    [   44.318084] x20: 0000000000000001 x19: ffffd0cedfd7b008 x18: ffff80008007bb58
    [   44.325320] x17: ffff80008007bc20 x16: 00000000c3947ad1 x15: 000000004d0489eb
    [   44.332557] x14: 000000001bca148c x13: 26357425424728cd x12: ffffd0cee02deb40
    [   44.339795] x11: 0000000000000001 x10: 0000000000000bb0 x9 : ffffd0cede588cf0
    [   44.347031] x8 : ffff430782a50c10 x7 : 0000000000000000 x6 : 000000004f43c695
    [   44.354268] x5 : 4000000000000000 x4 : ffff7238d73ec000 x3 : ffff7238d73ec000
    [   44.361505] x2 : 0000000000000001 x1 : ffff7238d73ec000 x0 : ffffd0cedfd7b008
    [   44.368741] Call trace:
    [   44.371212]  default_idle_call+0x54/0x100
    [   44.375273]  do_idle+0x218/0x278
    [   44.378541]  cpu_startup_entry+0x40/0x50
    [   44.382513]  secondary_start_kernel+0x130/0x158
    [   44.387110]  __secondary_switched+0xb8/0xc0


Cheers,
-- 
Cyril Brulebois (kibi@xxxxxxxxxx)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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