Created attachment 286211 [details] full dmesg of 5.3.11 armbian on odroid-c1 Booting odroid-c1 is fine however after some network (?) activity the system slows down showing several exceptions in dmesg Hardware: Odroid-C1 with USB network adapter: ID 0b95:772a ASIX Electronics Corp. AX88772A Fast Ethernet Softwarestack: Armbian Nightly / Debian Buster w. 5.3.11 previous Kernel 5.3.9 iirc showed similar error [58153.405330] hrtimer: interrupt took 965010 ns [58852.154986] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [58852.155544] rcu: 1-....: (243 ticks this GP) idle=d42/1/0x40000004 softirq=459500/459501 fqs=172 [58852.155789] (detected by 2, t=2105 jiffies, g=1378857, q=5917) [58852.156017] Sending NMI from CPU 2 to CPUs 1: [58852.171345] NMI backtrace for cpu 1 [58852.171525] CPU: 1 PID: 30069 Comm: kworker/1:3 Not tainted 5.3.11-odroidc1 #5.99.191113 [58852.171635] Hardware name: Amlogic Meson platform [58852.171736] Workqueue: events dbs_work_handler [58852.171903] PC is at memcpy+0x248/0x330 [58852.171988] LR is at 0x7b3bc7a8 [58852.172110] pc : [<c0e89948>] lr : [<7b3bc7a8>] psr: 20010113 [58852.172217] sp : eb1f3b70 ip : c7a8d173 fp : c1403080 [58852.172325] r10: 00000100 r9 : e36ba2bc r8 : aaeb211f [58852.172449] r7 : 4816ae97 r6 : 2595d57c r5 : 6b92dec8 r4 : 88d038a8 [58852.172572] r3 : 409b77d6 r2 : 00000270 r1 : ec453224 r0 : eb7ba5e4 [58852.172701] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [58852.172819] Control: 10c5387d Table: 2dd8c04a DAC: 00000051 [58852.172960] CPU: 1 PID: 30069 Comm: kworker/1:3 Not tainted 5.3.11-odroidc1 #5.99.191113 [58852.173066] Hardware name: Amlogic Meson platform [58852.173157] Workqueue: events dbs_work_handler ... see attached dmesg for more
possibly related/duplicate: https://bugzilla.kernel.org/show_bug.cgi?id=205211
Created attachment 288793 [details] serial log with this issue on 5.7.0-rc3 mainline Kernel 4.19.118 compiled with oldconfig and same userland (Armbian) does not show this issues (or not easily) Kernels 5.6.7 and 5.7.0-rc3 seem to exhibit the same issue attached the error that showed up in serial while doing a simple mtr <ip address>
since 4.19.x doesnt show the error this should be a regression
The bug might be related to a different default governor on Armbian as it was configured with GOVERNOR=interactive however Armbian Images are currently broken , still investigating locally modified Armbian