[Bug 294510] ip6_mroute: net.fibs>1 in VNET jails entails a panic
Date: Tue, 14 Apr 2026 08:48:55 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294510
Bug ID: 294510
Summary: ip6_mroute: net.fibs>1 in VNET jails entails a panic
Product: Base System
Version: 16.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: bugs@FreeBSD.org
Reporter: thomas.pasqualini@orange.com
Since latest FIBify and mroute changes, when the number of FIB is >=1 in a vnet
jail, a kernel panic occurs when the jail is being started.
ip6_mroute_rtnumfibs_change seems to be the root cause of the panic:
Starting background file system checks in 60 seconds.
Starting jails:panic: vm_fault_lookup: fault on nofault entry, addr:
0xfffffe017
3bfc000
cpuid = 22
time = 1776147877
KDB: stack backtrace:
#0 0xffffffff80a3495d at kdb_backtrace+0x5d
#1 0xffffffff809e8fc6 at vpanic+0x136
#2 0xffffffff809e8e83 at panic+0x43
#3 0xffffffff80cc5d9e at vm_fault+0x190e
#4 0xffffffff80cc43a1 at vm_fault_trap+0x81
#5 0xffffffff80e1bb3c at trap_pfault+0x1fc
#6 0xffffffff80defcf8 at calltrap+0x8
#7 0xffffffff80bbd719 at ip6_mroute_rtnumfibs_change+0xf9
#8 0xffffffff80b4550c at grow_rtables+0x20c
#9 0xffffffff80b457cc at vnet_rtables_init+0xcc
#10 0xffffffff80b4aba8 at vnet_alloc+0x118
#11 0xffffffff809a703a at kern_jail_set+0x1b5a
#12 0xffffffff809a867f at sys_jail_set+0x3f
#13 0xffffffff80e1c2e8 at amd64_syscall+0x118
#14 0xffffffff80df05eb at fast_syscall_common+0xf8
Uptime: 1m11s
Automatic reboot in 15 seconds - press a key on the console to abort
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