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openwrt/target/linux/mpc85xx
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Christian Lamparter dd7d4703e9 mpc85xx: backport "fix oops when CONFIG_FSL_PMC=n" 
Martin Kennedy reported:
|Presently, I get this kernel panic on mpc85xx (Aerohive HiveAP 370)
|on OpenWrt 'master' which occurs right as the second processor is
|initialized:
|
|[    0.478804] rcu: Hierarchical SRCU implementation.
|[    0.535569] dyndbg: Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build
|[    0.627233] smp: Bringing up secondary CPUs ...
|[    0.681659] kernel tried to execute user page (0) - exploit attempt? (uid: 0)
|[    0.766618] BUG: Unable to handle kernel instruction fetch (NULL pointer?)
|[    0.848899] Faulting instruction address: 0x00000000
|[    0.908273] Oops: Kernel access of bad area, sig: 11 [#1]
|[    0.972851] BE PAGE_SIZE=4K SMP NR_CPUS=2 P1020 RDB
|[    1.031179] Modules linked in:
|[    1.067640] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.10.80 #0
|[    1.139507] NIP:  00000000 LR: c0021d2c CTR: 00000000
|[    1.199921] REGS: c1051cf0 TRAP: 0400   Not tainted  (5.10.80)
|[...]
|[    1.758220] NIP [00000000] 0x0
|[    1.794688] LR [c0021d2c] smp_85xx_kick_cpu+0xe8/0x568
|[    1.856126] Call Trace:
|[    1.885295] [c1051da8] [c0021cb8] smp_85xx_kick_cpu+0x74/0x568 (unreliable)
|[    1.968633] [c1051de8] [c0011460] __cpu_up+0xc0/0x228
|[    2.029038] [c1051e18] [c0031bbc] bringup_cpu+0x30/0x224
|[    2.092572] [c1051e48] [c0031f3c] cpu_up.constprop.0+0x180/0x33c
|[..]
|[    2.727952] ---[ end trace 9b796a4bafb6bc14 ]---
|[    3.800879] Kernel panic - not syncing: Fatal exception
|[    3.862353] Rebooting in 1 seconds..
|[    5.905097] System Halted, OK to turn off power
|
|I bisected this down to commit 3ae5da5adc ("kernel: bump 5.10 to 5.10.80");
|that is, I don't get the panic right before this commit, but I do after.

He reported the issue upstream and Xiaoming Ni from huawei came up with
the patch (that is on it's way to upstream). While the AP370 is not in
Openwrt, this will likely affect other SMP P1020 devices OpenWrt ships
with: like the AP330, Enterasys WS-AP3710i, etc.

Reported-by: Martin Kennedy <hurricos@gmail.com>
Tested-by: Martin Kennedy <hurricos@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
 		2021-11-28 01:13:01 +01:00
..
base-files treewide: remove execute bit and shebang from board.d files 2021-03-06 11:30:06 +01:00
files/arch/powerpc mpc85xx: convert mtd-mac-address to nvmem implementation 2021-07-19 14:51:22 +02:00
image mpc85xx: switch to Kernel 5.10 2021-10-05 23:54:48 +02:00
p1010 treewide: remove redundant ubifs kconfig symbols 2021-04-21 10:31:07 +01:00
p1020 kernel: 5.10: add missing symbols 2021-10-05 23:54:18 +02:00
p2020 kernel: move two symbols to the generic kconfigs 2021-08-29 17:07:19 +02:00
patches-5.4 kernel: bump 5.4 to 5.4.75 2020-11-10 13:11:32 +01:00
patches-5.10 mpc85xx: backport "fix oops when CONFIG_FSL_PMC=n" 2021-11-28 01:13:01 +01:00
Makefile mpc85xx: switch to Kernel 5.10 2021-10-05 23:54:48 +02:00
config-5.4 treewide: switch the timer frequency to 100 Hz 2021-04-21 10:31:10 +01:00
config-5.10 kernel: 5.10: packet mangling code only for ar8216 driver 2021-11-02 22:36:41 +01:00