On Mon, Jun 14, 2021 at 04:25:04PM +0100, Matthew Reeve wrote: > Hi, > > when using bird 2.0.8 on openwrt 21.02 (and other versions) on a Netgear > R7800 router, if the OSPF protocol is used, either v2 or v3, bird > immediately crashes on startup with: > > Fri Jun 11 14:41:11 2021 daemon.info bird: Started > Fri Jun 11 14:41:11 2021 kern.err kernel: [ 3500.853248] Alignment trap: not > handling instruction f44c0a1f at [<00035848>] Fri Jun 11 14:41:11 2021 > kern.alert kernel: [ 3500.853283] 8<--- cut here --- > Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.859363] Unhandled fault: > alignment exception (0x801) at 0x007e0624 > Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.862443] pgd = 0bbef4fd > Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.868821] [007e0624] > *pgd=5d6ca835, *pte=5c40b75f, *ppte=5c40bc7f > > > This router uses an ARMv7 processor and the issue seems to be to do with > memory alignment issues. I've debugged it and traced it to an access to the > top_hash_entry struct. I've found that if I add the PACKED macro to the > struct definition then it fixes the problem, as per this patch:
Hi Thanks, could you try to get backtrace from the coredump using gdb to see where is the invalid access? -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: [email protected]) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."
