https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230845
Bug ID: 230845
Summary: VIMAGE regression: breaks netfront suspend/resume
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: roy...@freebsd.org
Hello,
It seems like some VIMAGE changes have broken netfront suspend/resume, here is
the trace on resume from suspension:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x28
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80c92f18
stack pointer = 0x28:0xfffffe0000571670
frame pointer = 0x28:0xfffffe0000571690
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 16 (xenwatch)
Tracing pid 16 tid 100074 td 0xfffff80003890580
ether_output_frame() at ether_output_frame+0x58/frame 0xfffffe0000571690
ether_output() at ether_output+0x68b/frame 0xfffffe0000571730
arprequest() at arprequest+0x444/frame 0xfffffe0000571840
arp_ifinit() at arp_ifinit+0x58/frame 0xfffffe0000571880
netfront_backend_changed() at netfront_backend_changed+0x1b4/frame
0xfffffe0000571940
xenwatch_thread() at xenwatch_thread+0x182/frame 0xfffffe0000571970
fork_exit() at fork_exit+0x84/frame 0xfffffe00005719b0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00005719b0
The code that triggers the bug in netfront is:
/**
* If this interface has an ipv4 address, send an arp for it. This
* helps to get the network going again after migrating hosts.
*/
static void
netfront_send_fake_arp(device_t dev, struct netfront_info *info)
{
struct ifnet *ifp;
struct ifaddr *ifa;
ifp = info->xn_ifp;
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family == AF_INET) {
arp_ifinit(ifp, ifa);
}
}
}
I really have no idea of what's missing here, so any help by people involved
with VIMAGE in order to fix this regression would be greatly appreciated.
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