https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275474
Bug ID: 275474
Summary: if_gre: kernel panic when doing ifconfig deletetunnel
on interface with udpencap
Product: Base System
Version: 14.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I'm using udpencap of the if_gre interface and stumbled across a bug where when
decommissioning a if_gre interface with the ifconfig deletetunnel (or -tunnel)
command panics the system.
I reduced the panic to running these commands on any vanilla 13.2 or
14.0-RELEASE:
ifconfig gre1 create
ifconfig gre2 create
ifconfig gre1 tunnel 127.0.0.1 127.0.0.3 udpencap
ifconfig gre2 tunnel 127.0.0.1 127.0.0.2 udpencap
ifconfig gre1 -udpencap
ifconfig gre2 -udpencap
ifconfig gre1 deletetunnel
ifconfig gre2 deletetunnel
I can also trigger the same when running theses commands three times in a row:
ifconfig gre1 create
ifconfig gre2 create
ifconfig gre1 tunnel 127.0.0.1 127.0.0.3 udpencap
ifconfig gre2 tunnel 127.0.0.1 127.0.0.2 udpencap
ifconfig gre1 deletetunnel
ifconfig gre2 deletetunnel
Doing the tunnel command without the udpencap stops the crashing.
I can get a crashdump and this is what I get:
# lldb /boot/kernel/kernel -c /var/crash/vmcore.0
(lldb) target create "/boot/kernel/kernel" --core "/var/crash/vmcore.0"
Core file '/var/crash/vmcore.0' (x86_64) was loaded.
(lldb) bt
* thread #1, name = '(pid 69501) ifconfig (crashed)'
* frame #0: 0xffffffff80c066ae kernel`doadump + 46
frame #1: 0xffffffff80c0648a kernel`kern_reboot + 1082
frame #2: 0xffffffff80c0692e kernel`vpanic + 446
frame #3: 0xffffffff80c06763 kernel`panic + 67
frame #4: 0xffffffff810b1fa7 kernel`trap_fatal + 903
frame #5: 0xffffffff810b1fff kernel`trap_pfault + 79
frame #6: 0xffffffff81088fe8 kernel`calltrap + 8
frame #7: 0xfffff800237c63b0
frame #8: 0xffffffff80ca674d kernel`soclose + 205
frame #9: 0xffffffff82320fa1
frame #10: 0xffffffff8232086f
frame #11: 0xffffffff80d1d557 kernel`ifhwioctl + 2023
frame #12: 0xffffffff80d1f218 kernel`ifioctl + 1912
frame #13: 0xffffffff80c749fd kernel`kern_ioctl + 621
frame #14: 0xffffffff80c746e0 kernel`sys_ioctl + 256
frame #15: 0xffffffff810b289c kernel`amd64_syscall + 268
frame #16: 0xffffffff810898fb kernel`fast_syscall_common + 248
Any ideas?
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