physmap warning on next-20210921

Tue Sep 21 05:42:29 PDT 2021

Hi,

When I'm building an allmodconfig kernel (arm64) with
KCONFIG_ALLCONFIG=arch/arm64/configs/defconfig all the bootselftests
turned off also.
I see the following warning.

[   51.296773][    T1] physmap-flash 0.flash: physmap platform flash
device: [mem 0x00000000-0x03ffffff]
[   51.312682][    T1] 0.flash: Found 2 x16 devices at 0x0 in 32-bit
bank. Manufacturer ID 0x000000 Chip ID 0x000000
[   51.319200][    T1] Intel/Sharp Extended Query Table at 0x0031
[   51.325766][    T1] Using buffer write method
[   51.669918][    T1] physmap-flash 0.flash: physmap platform flash
device: [mem 0x04000000-0x07ffffff]
[   51.685287][    T1] 0.flash: Found 2 x16 devices at 0x0 in 32-bit
bank. Manufacturer ID 0x000000 Chip ID 0x000000
[   51.691522][    T1] Intel/Sharp Extended Query Table at 0x0031
[   51.697787][    T1] Using buffer write method
[   51.700958][    T1] Concatenating MTD devices:
[   51.703307][    T1] (0): "0.flash"
[   51.704752][    T1] (1): "0.flash"
[   51.706205][    T1] into device "0.flash"
[   51.946281][    T9] _warn_unseeded_randomness: 3 callbacks suppressed
[   51.946331][    T9] random: get_random_u64 called from
dup_task_struct+0x184/0x340 with crng_init=0
[   51.980825][  T114] kworker/u2:1 (114) used greatest stack depth:
26576 bytes left
[   52.087262][    T1] platform physmap-flash.0: failed to claim
resource 0: [mem 0x08000000-0x07ffffff]
[   52.092697][    T1] Deleting MTD partitions on "0.flash":
[   52.111033][    T1] random: get_random_u32 called from
kobject_release+0x44/0x180 with crng_init=0
[   52.111193][    T1] kobject: 'integrity' (ffff00001019f198):
kobject_release, parent 0000000000000000 (delayed 500)
[   52.151410][    T1] kobject: '31:0' (ffff00000f14b800):
kobject_release, parent 0000000000000000 (delayed 250)
[   52.197408][    T1] kobject: 'holders' (ffff00000f0fc500):
kobject_release, parent ffff00000be10f90 (delayed 750)
[   52.202305][    T1] kobject: 'slaves' (ffff00000f0fd900):
kobject_release, parent ffff00000be10f90 (delayed 750)
[   52.240140][    T1] random: get_random_u32 called from
shuffle_freelist+0x44/0x1c0 with crng_init=0
[   52.476276][    T1] kobject: 'mtd0' (ffff00000f14d008):
kobject_release, parent 0000000000000000 (delayed 1000)
[   52.510094][    T1] kobject: 'mtd0' (ffff00000f1411a0):
kobject_release, parent 0000000000000000 (delayed 500)
[   52.515268][    T1] ------------[ cut here ]------------
[   52.517264][    T1] ODEBUG: free active (active state 0) object
type: timer_list hint: delayed_work_timer_fn+0x0/0x80
[   52.522813][    T1] WARNING: CPU: 0 PID: 1 at
lib/debugobjects.c:505 debug_print_object+0xe8/0x140
[   52.526642][    T1] Modules linked in:
[   52.528416][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G
        T 5.15.0-rc2-next-20210921 #1
c5f525bba77d859d4ce569d244b0730e944cd9ea
[   52.533761][    T1] Hardware name: linux,dummy-virt (DT)
[   52.536052][    T1] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT
-SSBS BTYPE=--)
[   52.539277][    T1] pc : debug_print_object+0xe8/0x140
[   52.541579][    T1] lr : debug_print_object+0xe8/0x140
[   52.543830][    T1] sp : ffff800016327930
[   52.545641][    T1] x29: ffff800016327930 x28: ffff80001620dc48
x27: 0000000000000000
[   52.549114][    T1] x26: ffff8000102748c0 x25: ffff80001013f780
x24: ffff800011fdc200
[   52.552577][    T1] x23: ffff80001223e740 x22: ffff80001223e1c0
x21: ffff80001223d960
[   52.556073][    T1] x20: ffff80001397ee60 x19: 0000000000000000
x18: 0000000000000000
[   52.559538][    T1] x17: 0000000000000000 x16: 0000000000000000
x15: 6570797420746365
[   52.563021][    T1] x14: 6a626f2029302065 x13: 0000000000041c40
x12: 0000000000041bd8
[   52.566491][    T1] x11: 0000000000000000 x10: 0000000000000000 x9
: 0000000000000000
[   52.569961][    T1] x8 : 0000000000000000 x7 : 0000000000000000 x6
: 0000000000000000
[   52.573445][    T1] x5 : 0000000000000000 x4 : 0000000000000000 x3
: 0000000000000000
[   52.576912][    T1] x2 : 0000000000000000 x1 : 0000000000000000 x0
: 0000000000000000
[   52.580369][    T1] Call trace:
[   52.581845][    T1]  debug_print_object+0xe8/0x140
[   52.583979][    T1]  __debug_check_no_obj_freed+0x11c/0x2c0
[   52.586437][    T1]  debug_check_no_obj_freed+0x30/0xc0
[   52.588729][    T1]  slab_free_freelist_hook+0x154/0x2c0
[   52.591078][    T1]  kfree+0x14c/0x2c0
[   52.592819][    T1]  mtd_concat_destroy+0x3c/0x80
[   52.594918][    T1]  physmap_flash_remove+0x88/0x180
[   52.597134][    T1]  platform_remove+0x3c/0x80
[   52.599129][    T1]  __device_release_driver+0x1d4/0x340
[   52.601471][    T1]  driver_detach+0x130/0x200
[   52.603457][    T1]  bus_remove_driver+0xf4/0x180
[   52.605550][    T1]  driver_unregister+0x58/0x80
[   52.607599][    T1]  platform_driver_unregister+0x1c/0x40
[   52.609969][    T1]  physmap_init+0xb8/0xf0
[   52.611863][    T1]  do_one_initcall+0xa4/0x2c0
[   52.613893][    T1]  do_initcalls+0x174/0x23c
[   52.615854][    T1]  kernel_init_freeable+0x2cc/0x370
[   52.618094][    T1]  kernel_init+0x24/0x180
[   52.620005][    T1]  ret_from_fork+0x10/0x20
[   52.621948][    T1] irq event stamp: 687638
[   52.623797][    T1] hardirqs last  enabled at (687637):
[<ffff800010208d60>] __up_console_sem+0x60/0xc0
[   52.627698][    T1] hardirqs last disabled at (687638):
[<ffff800011ef5b28>] el1_dbg+0x28/0x80
[   52.631304][    T1] softirqs last  enabled at (687634):
[<ffff800010010518>] __do_softirq+0x418/0x4f8
[   52.635126][    T1] softirqs last disabled at (687627):
[<ffff8000101079f8>] __irq_exit_rcu+0x1b8/0x280
[   52.639116][    T1] ---[ end trace 5aee148b589c1673 ]---
[   53.261155][   T13] _warn_unseeded_randomness: 2 callbacks suppressed
[   53.261201][   T13] random: get_random_u32 called from
shuffle_freelist+0x44/0x1c0 with crng_init=0
[   54.367115][    T1] random: get_random_u32 called from
kobject_release+0x44/0x180 with crng_init=0
[   54.367240][    T1] kobject: 'physmap-flash' (ffff00000efe3200):
kobject_release, parent ffff000008171a00 (delayed 750)
[   54.377889][    T1] random: get_random_u32 called from
shuffle_freelist+0x44/0x1c0 with crng_init=0

This is my qemu cmd line:
qemu-system-aarch64 --enable-kvm -cpu cortex-a53 -kernel
Image-20210921-3.gz -serial stdio -monitor none -nographic -m 2G -M
virt -fsdev local,id=root,path=/srv/kvm/tmp/stretch/arm64,security_model=none,writeout=immediate
-device virtio-rng-pci -device
virtio-9p-pci,fsdev=root,mount_tag=/dev/root -append "root=/dev/root
rootfstype=9p rootflags=trans=virtio console=ttyAMA0,38400n8
earlycon=pl011,0x9000000 initcall_debug softlockup_panic=0
security=none kpti=no"

I did not expect the physmp-flash device to be used at all.
Does anyone see what might be wrong here ?

Cheers,
Anders