Re: [REGRESSION] mainline/master: Apalis iMX6 no longer boots

[Frank Li]

On Mon, Jun 29, 2026 at 11:34:32AM -0300, Leonardo Costa wrote:
> Hello,
>
> We are seeing a regression on Apalis iMX6 where the kernel doesn't boot in the
> newest v7.2-rc1 (it was working before, in v7.1). The device tree being used is the imx6q-apalis-eval.dtb. The kernel
> configuration used is the one shown below:
>
>     https://gist.github.com/lcosta37/53efdb2fb6e6e0fc05437c7e53b47737
>
> The kernel logs stop almost immediately as the board starts to boot, and I
> don't notice any difference in the logs that points to the cause.
>
> Is this known? We are seeing this behavior on all Apalis iMX6 modules, though
> we don't see it on Colibri iMX6, so it is not SoC-specific.

Can you help bisect to locate which commit cause this problem?

Frank

>
> Logs from v7.2-rc1 (not working, printing stops after the last line pasted
> here):
>
>     [    0.000000] Booting Linux on physical CPU 0x0
>     [    0.000000] Linux version 7.2.0-rc1-0.0.0-devel (oe-user@oe-host) (arm-tdx-linux-gnueabi-gcc (GCC) 16.1.0, GNU ld (GNU Binutils) 2.46.1) #1 SMP PREEMPT Sun Jun 28 19:01:31 UTC 2026
>     [    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d
>     [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
>     [    0.000000] OF: fdt: Machine model: Toradex Apalis iMX6Q/D Module on Apalis Evaluation Board
>     [    0.000000] Memory policy: Data cache writealloc
>     [    0.000000] cma: Reserved 256 MiB at 0x40000000
>     [    0.000000] OF: reserved mem: Reserved memory: No reserved-memory node in the DT
>     [    0.000000] Zone ranges:
>     [    0.000000]   Normal   [mem 0x0000000010000000-0x000000003fffffff]
>     [    0.000000]   HighMem  [mem 0x0000000040000000-0x000000004fffffff]
>     [    0.000000] Movable zone start for each node
>     [    0.000000] Early memory node ranges
>     [    0.000000]   node   0: [mem 0x0000000010000000-0x000000004fffffff]
>     [    0.000000] Initmem setup node 0 [mem 0x0000000010000000-0x000000004fffffff]
>     [    0.000000] percpu: Embedded 15 pages/cpu s28684 r8192 d24564 u61440
>     [    0.000000] Kernel command line: root=PARTUUID=adb2cea1-02 ro rootwait console=tty1 console=ttymxc0,115200
>     [    0.000000] printk: log buffer data + meta data: 131072 + 409600 = 540672 bytes
>     [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
>     [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
>     [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 262144
>     [    0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
>     [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
>     [    0.000000] rcu: Preemptible hierarchical RCU implementation.
>     [    0.000000] rcu:     RCU event tracing is enabled.
>     [    0.000000]  Trampoline variant of Tasks RCU enabled.
>     [    0.000000]  Tracing variant of Tasks RCU enabled.
>     [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
>     [    0.000000] RCU Tasks: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
>     [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
>     [    0.000000] L2C-310 errata 752271 769419 enabled
>     [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
>     [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
>     [    0.000000] L2C-310 ID prefetch enabled, offset 16 lines
>
>
> Logs from v7.1 (working) (full logs here: https://paste.debian.net/hidden/0f65ae5f)
>
>     [    0.000000] Booting Linux on physical CPU 0x0
>     [    0.000000] Linux version 7.1.0-0.0.0-devel (oe-user@oe-host) (arm-tdx-linux-gnueabi-gcc (GCC) 16.1.0, GNU ld (GNU Binutils) 2.46.1) #1 SMP PREEMPT Wed Jun 24 01:36:41 UTC 2026
>     [    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d
>     [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
>     [    0.000000] OF: fdt: Machine model: Toradex Apalis iMX6Q/D Module on Apalis Evaluation Board
>     [    0.000000] Memory policy: Data cache writealloc
>     [    0.000000] cma: Reserved 256 MiB at 0x40000000
>     [    0.000000] OF: reserved mem: Reserved memory: No reserved-memory node in the DT
>     [    0.000000] Zone ranges:
>     [    0.000000]   Normal   [mem 0x0000000010000000-0x000000003fffffff]
>     [    0.000000]   HighMem  [mem 0x0000000040000000-0x000000004fffffff]
>     [    0.000000] Movable zone start for each node
>     [    0.000000] Early memory node ranges
>     [    0.000000]   node   0: [mem 0x0000000010000000-0x000000004fffffff]
>     [    0.000000] Initmem setup node 0 [mem 0x0000000010000000-0x000000004fffffff]
>     [    0.000000] percpu: Embedded 15 pages/cpu s28684 r8192 d24564 u61440
>     [    0.000000] pcpu-alloc: s28684 r8192 d24564 u61440 alloc=15*4096
>     [    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
>     [    0.000000] Kernel command line: root=PARTUUID=4ce4ba92-02 ro rootwait console=tty1 console=ttymxc0,115200
>     [    0.000000] printk: log buffer data + meta data: 131072 + 409600 = 540672 bytes
>     [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
>     [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
>     [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 262144
>     [    0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
>     [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
>     [    0.000000] rcu: Preemptible hierarchical RCU implementation.
>     [    0.000000] rcu:     RCU event tracing is enabled.
>     [    0.000000]  Trampoline variant of Tasks RCU enabled.
>     [    0.000000]  Tracing variant of Tasks RCU enabled.
>     [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
>     [    0.000000] RCU Tasks: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
>     [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
>     [    0.000000] L2C-310 errata 752271 769419 enabled
>     [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
>     [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
>     [    0.000000] L2C-310 ID prefetch enabled, offset 16 lines
>     [    0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled
>     [    0.000000] L2C-310 cache controller enabled, 16 ways, 1024 kB
>     [    0.000000] L2C-310: CACHE_ID 0x410000c7, AUX_CTRL 0x76470001
>     [    0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
>     [    0.000000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
>     [    0.000000] Switching to timer-based delay loop, resolution 333ns
>     [    0.000001] sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns
>     [    0.000018] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns
>     [    0.001910] Console: colour dummy device 80x30
>     [    0.001926] printk: legacy console [tty1] enabled
>     [    0.002519] Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=30000)
>     [    0.002561] CPU: Testing write buffer coherency: ok
>     [    0.002627] CPU0: Spectre v2: using BPIALL workaround
>     [    0.002650] pid_max: default: 32768 minimum: 301
>     [    0.002989] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
>     [    0.003038] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
>     [    0.003430] VFS: Finished mounting rootfs on nullfs
>     [    0.004538] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
>     [    0.006552] Setting up static identity map for 0x10100000 - 0x10100060
>     [    0.006835] rcu: Hierarchical SRCU implementation.
>     [    0.006864] rcu:     Max phase no-delay instances is 1000.
>     [    0.007320] Timer migration: 1 hierarchy levels; 8 children per group; 1 crossnode level
>     [    0.008854] smp: Bringing up secondary CPUs ...
>     [    0.010035] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>     [    0.010218] CPU1: Spectre v2: using BPIALL workaround
>     [    0.011412] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
>     [    0.011581] CPU2: Spectre v2: using BPIALL workaround
>     [    0.012747] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
>     [    0.012917] CPU3: Spectre v2: using BPIALL workaround
>     [    0.013109] smp: Brought up 1 node, 4 CPUs
>     ...
>