On 29.01.19 22:06, Lowell Gilbert via Xenomai wrote:
I was trying to update to 3.0.8, and looking at stat or acct in the
sched branch of the proc tree gives me an instant kernel crash, usually
with a null pointer access from a bogus code address, although the
locations aren't always the same. This is without even having my kernel
module or application loaded.
The system is a dual-core Cortex-A9.
Any idea what might be going on? Details follow.
[ 121.205418] Unable to handle kernel NULL pointer dereference at virtual
address 00000000
[ 121.213493] pgd = ee7e0000
[ 121.216198] [00000000] *pgd=3f8ff831
[ 121.219787] Internal error: Oops: 80000007 [#1] SMP ARM
[ 121.225000] Modules linked in:
[ 121.228066] CPU: 0 PID: 1113 Comm: cat Not tainted
4.14.73-ltsi-09035-gb67570c09362-dirty #2
[ 121.236474] Hardware name: Altera SOCFPGA
[ 121.240475] I-pipe domain: Linux
[ 121.243699] task: ef302e00 task.stack: ee656000
[ 121.248221] PC is at 0x0
[ 121.250776] LR is at __ipipe_ack_hrtimer_irq+0x48/0x80
[ 121.255901] pc : [<00000000>] lr : [<c01be9cc>] psr: a0060193
[ 121.262149] sp : ee657c60 ip : ee657c60 fp : ee657c74
[ 121.267360] r10: 00000001 r9 : 00000012 r8 : ee657ce8
[ 121.272571] r7 : 00000011 r6 : 00000000 r5 : ef004900 r4 : ef7c01b0
[ 121.279077] r3 : 00000000 r2 : c0c919c0 r1 : 00000001 r0 : ef004900
[ 121.285587] Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment
none
[ 121.292786] Control: 10c5387d Table: 2e7e004a DAC: 00000051
[ 121.298517] Process cat (pid: 1113, stack limit = 0xee656220)
and
[ 121.727414] Unable to handle kernel NULL pointer dereference at virtual
address 00000024
[ 121.735477] pgd = c0004000
[ 121.738183] [00000024] *pgd=00000000
[ 121.741763] Internal error: Oops: 17 [#2] SMP ARM
[ 121.746455] Modules linked in:
[ 121.749517] CPU: 0 PID: 1113 Comm: cat Tainted: G D
4.14.73-ltsi-09035-gb67570c09362-dirty #2
[ 121.759134] Hardware name: Altera SOCFPGA
[ 121.763133] I-pipe domain: Linux
[ 121.766356] task: ef302e00 task.stack: ee656000
[ 121.770880] PC is at unmap_page_range+0x6c/0x624
[ 121.775488] LR is at unmap_single_vma+0x8c/0x94
[ 121.780008] pc : [<c026a678>] lr : [<c026acbc>] psr: 20060113
[ 121.786255] sp : ee657920 ip : c026a624 fp : ee6579a4
[ 121.791464] r10: ee657a08 r9 : c0939688 r8 : 00010000
[ 121.796675] r7 : ee657a08 r6 : 00010000 r5 : eea41f00 r4 : 00000001
[ 121.803181] r3 : 00000000 r2 : 00000000 r1 : 00018000 r0 : c0ccb3c0
[ 121.809689] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 121.816800] Control: 10c5387d Table: 2e7e004a DAC: 00000051
[ 121.822530] Process cat (pid: 1113, stack limit = 0xee656220)
[ 121.828259] Stack: (0xee657920 to 0xee658000)
Does this patch happen to help?
https://gitlab.denx.de/Xenomai/xenomai/commit/02500efff060c293a74fa4c914c19b8e1504b9a3
It's in next only so far but scheduled for stable.
Otherwise: Is your I-pipe patch from upstream or self-developed. I suspect the
latter as your kernel claims to be LTSI-based.
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
