with kernel 6.4 update, boot fails drops into maintenance

Hi,

I have a Fire T2000 which has been stable for my usage for months.
Now I upgraded kernel (and userland) in debian to:

Yesterday, when hooking up a serial console, i was getting asked for 
root password and dropped into maintenance mode.
Today I hooked up better through a console with minicom to be able to 
copy the error, but I get these errors again and again:


[   17.134833] OOPS: RPC [000000000042ce10]
[   17.134843] OOPS: RPC <arch_cpu_idle+0x70/0xc0>
[   17.134875] OOPS: Fault was to vaddr[bc0]
[   17.134885] CPU: 25 PID: 0 Comm: swapper/25 Tainted: G D            
6.4.0-1-sparc64-smp #1  Debian 6.4.4-2
[   17.134908] Call Trace:
[   17.134915] [<0000000000de9614>] dump_stack+0x8/0x18
[   17.134948] [<0000000000df547c>] do_sparc64_fault+0x4bc/0xb00
[   17.134979] [<0000000000407714>] sparc64_realfault_common+0x10/0x20
[   17.135017] [<0000000000000bc0>] 0xbc0
[   17.135034] [<0000000000dea050>] default_idle_call+0x30/0x120
[   17.135067] [<00000000004c32f8>] do_idle+0xd8/0x1a0
[   17.135095] [<00000000004c3684>] cpu_startup_entry+0x24/0x40
[   17.135123] [<0000000000440f28>] smp_callin+0xe8/0x120
[   17.135145] [<00000000010d8c14>] 0x10d8c14
[   17.135162] [<0000000000000000>] 0x0
[   17.135179] Unable to handle kernel NULL pointer dereference
[   17.135187] tsk->{mm,active_mm}->context = 0000000000000041
[   17.135197] tsk->{mm,active_mm}->pgd = ffff800017270000
[   17.135207]               \|/ ____ \|/
[   17.135207]               "@'/ .. \`@"
[   17.135207]               /_| \__/ |_\
[   17.135207]                  \__U_/
[   17.135216] swapper/25(0): Oops [#49]
[   17.135230] CPU: 25 PID: 0 Comm: swapper/25 Tainted: G D            
6.4.0-1-sparc64-smp #1  Debian 6.4.4-2
[   17.135253] TSTATE: 0000004411001605


so something worsened! darn! this looks as back when all kernels failed 
to boot on the Niagara.
I set up minicom to log to a file and see see if I can catch something 
before the crashes.

A reboot... shows this again:
   Booting `Debian GNU/Linux'

Loading Linux 6.4.0-1-sparc64-smp ...
Loading initial ramdisk ...

/dev/sda2: clean, 429184/4276224 files, 8886587/17089844 blocks
[   42.149954] /dev/sda: Can't open blockdev
[FAILED] Failed to mount boot.mount - /boot.
[DEPEND] Dependency failed for local-fs.target - Local File Systems.
You are in emergency mode. After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, or "exit"
to continue bootup.
Give root password for maintenance
(or press Control-D to continue):

dmesg shows:
[   42.149954] /dev/sda: Can't open blockdev
[   42.745098] Kernel unaligned access at TPC[850ebc] 
aa_dfa_unpack+0x3c/0x5a0
[   42.745167] Kernel unaligned access at TPC[850ed0] 
aa_dfa_unpack+0x50/0x5a0
[   42.745207] Kernel unaligned access at TPC[850f68] 
aa_dfa_unpack+0xe8/0x5a0
[   42.745254] Kernel unaligned access at TPC[850f68] 
aa_dfa_unpack+0xe8/0x5a0
[   42.745298] Kernel unaligned access at TPC[850f68] 
aa_dfa_unpack+0xe8/0x5a0
[   42.760418] audit: type=1400 audit(1690795782.060:2): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="nvidia_modprobe" pid=631 comm="apparmor_parser"
[   42.760469] audit: type=1400 audit(1690795782.060:3): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="nvidia_modprobe//kmod" pid=631 comm="apparmor_"
[   42.764485] audit: type=1400 audit(1690795782.064:4): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="lsb_release" pid=630 comm="apparmor_parser"
[   42.773434] audit: type=1400 audit(1690795782.072:5): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="/usr/bin/man" pid=633 comm="apparmor_parser"
[   42.773480] audit: type=1400 audit(1690795782.072:6): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="man_filter" pid=633 comm="apparmor_parser"
[   42.773509] audit: type=1400 audit(1690795782.072:7): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="man_groff" pid=633 comm="apparmor_parser"
[   42.904068] audit: type=1400 audit(1690795782.204:8): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="/usr/lib/NetworkManager/nm-dhcp-client.action""
[   42.904121] audit: type=1400 audit(1690795782.204:9): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=63"
[   42.904153] audit: type=1400 audit(1690795782.204:10): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="/usr/lib/connman/scripts/dhclient-script" pid"
[   42.904183] audit: type=1400 audit(1690795782.204:11): 
apparmor="STATUS" operation="profile_load" profile="unconfined" 
name="/{,usr/}sbin/dhclient" pid=632 comm="apparmor"
[   42.960067] RPC: Registered named UNIX socket transport module.
[   42.960093] RPC: Registered udp transport module.
[   42.960108] RPC: Registered tcp transport module.
[   42.960121] RPC: Registered tcp NFSv4.1 backchannel transport module.
[   43.603086] ------------[ cut here ]------------
[   43.603111] WARNING: CPU: 4 PID: 668 at kernel/irq/msi.c:196 
msi_domain_free_descs+0xf4/0x120
[   43.603170] Modules linked in: sunrpc binfmt_misc libdes sg flash drm 
drm_panel_orientation_quirks i2c_core dm_mod fuse loop configfs 
ip_tables x_tables autofs4 ext4 crc1n
[   43.603683] CPU: 4 PID: 668 Comm: ip Not tainted 6.4.0-1-sparc64-smp 
#1  Debian 6.4.4-2
[   43.603715] Call Trace:
[   43.603727] [<0000000000de9614>] dump_stack+0x8/0x18
[   43.603771] [<000000000046e208>] __warn+0xc8/0x120
[   43.603800] [<000000000046e2c0>] warn_slowpath_fmt+0x60/0x100
[   43.603827] [<00000000004f96b4>] msi_domain_free_descs+0xf4/0x120
[   43.603866] [<00000000004f9b60>] 
msi_domain_free_msi_descs_range+0x20/0x40
[   43.603903] [<0000000000a1e760>] pci_msi_teardown_msi_irqs+0x40/0x60
[   43.603952] [<0000000000a1e14c>] pci_free_msi_irqs+0xc/0x40
[   43.603988] [<0000000000a1c390>] pci_disable_msi+0x50/0x80
[   43.604021] [<000000001004b800>] e1000e_open+0x420/0x600 [e1000e]
[   43.604191] [<0000000000b9262c>] __dev_open+0xec/0x1c0
[   43.604232] [<0000000000b92b58>] __dev_change_flags+0x1b8/0x260
[   43.604266] [<0000000000b92c1c>] dev_change_flags+0x1c/0x80
[   43.604298] [<0000000000ba4720>] do_setlink+0x300/0x11e0
[   43.604336] [<0000000000baadcc>] __rtnl_newlink+0x54c/0x880
[   43.604374] [<0000000000bab134>] rtnl_newlink+0x34/0x60
[   43.604407] [<0000000000ba3324>] rtnetlink_rcv_msg+0x244/0x340
[   43.604441] ---[ end trace 0000000000000000 ]---
[   45.928446] e1000e 0000:04:00.0 enp4s0f0: NIC Link is Up 1000 Mbps 
Full Duplex, Flow Control: Rx/Tx
[   45.928724] IPv6: ADDRCONF(NETDEV_CHANGE): enp4s0f0: link becomes ready


a single crash, once. Doesn't seem like the upper one.

If I select my next kernel I have:
Linux narya 6.1.0-9-sparc64-smp #1 SMP Debian 6.1.27-1 (2023-05-08) sparc64

all still works perfectly fine!


Riccardo