Random crash on latest 23.09.1

Yathus

i had my first crash on a vmotion on the secondary pfsense :

Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 03
fault virtual address	= 0x0
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff80fb1c0a
stack pointer	        = 0x0:0xfffffe000859f7d0
frame pointer	        = 0x0:0xfffffe000859f920
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		= 0 (if_io_tqg_3)
rdi: 0000000000000000 rsi: fffff800b4b9c07a rdx: 0000000000000000
rcx: 0000000005966257  r8: 00000000a1990c31  r9: 0000000023e34fa7
rax: 0000000000000002 rbx: fffff800b4b9c000 rbp: fffffe000859f920
r10: 0000000000003354 r11: fffff800b4b9c000 r12: fffffe000859f980
r13: 0000000000000000 r14: 0000000000000000 r15: fffff8000cce2608
trap number		= 12
panic: page fault
cpuid = 3
time = 1707492630
KDB: enter: panic

i vmotion the primary and no crash...

stephenw10

We need to see the backtrace to know more there.

Yathus

@stephenw10 i upload files in your nextcloud link.

stephenw10

Backtrace:

db:1:pfs> bt
Tracing pid 0 tid 100014 td 0xfffffe000932a740
kdb_enter() at kdb_enter+0x32/frame 0xfffffe000859f4b0
vpanic() at vpanic+0x163/frame 0xfffffe000859f5e0
panic() at panic+0x43/frame 0xfffffe000859f640
trap_fatal() at trap_fatal+0x40c/frame 0xfffffe000859f6a0
trap_pfault() at trap_pfault+0x4f/frame 0xfffffe000859f700
calltrap() at calltrap+0x8/frame 0xfffffe000859f700
--- trap 0xc, rip = 0xffffffff80fb1c0a, rsp = 0xfffffe000859f7d0, rbp = 0xfffffe000859f920 ---
pf_test_state_tcp() at pf_test_state_tcp+0x125a/frame 0xfffffe000859f920
pf_test() at pf_test+0x1353/frame 0xfffffe000859fac0
pf_check_in() at pf_check_in+0x27/frame 0xfffffe000859fae0
pfil_mbuf_in() at pfil_mbuf_in+0x38/frame 0xfffffe000859fb10
ip_input() at ip_input+0x3ae/frame 0xfffffe000859fb70
netisr_dispatch_src() at netisr_dispatch_src+0x22c/frame 0xfffffe000859fbc0
ether_demux() at ether_demux+0x149/frame 0xfffffe000859fbf0
ether_nh_input() at ether_nh_input+0x36e/frame 0xfffffe000859fc50
netisr_dispatch_src() at netisr_dispatch_src+0xaf/frame 0xfffffe000859fca0
ether_input() at ether_input+0x69/frame 0xfffffe000859fd00
iflib_rxeof() at iflib_rxeof+0xc46/frame 0xfffffe000859fe00
_task_fn_rx() at _task_fn_rx+0x72/frame 0xfffffe000859fe40
gtaskqueue_run_locked() at gtaskqueue_run_locked+0x14e/frame 0xfffffe000859fec0
gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0xc2/frame 0xfffffe000859fef0
fork_exit() at fork_exit+0x7f/frame 0xfffffe000859ff30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe000859ff30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---

So not the same issue.

Seems similar to a few other bugs but not identical.
The message buffer shows it failing back and forth between the nodes a few times was that expected?

kprovost

@stephenw10 said in Random crash on latest 23.09.1:

That last backtrace decodes to /var/jenkins/workspace/pfSense-Plus-snapshots-23_09_1-main/sources/FreeBSD-src-plus-RELENG_23_09_1/sys/netpfil/pf/pf.c:5743, which is in pf_test_state_tcp(), where it applies NAT. It likely means that the state has a NULL key (pf_kstate->key[]).
It's not clear to me how that'd happen. Speculatively, perhaps there's a race on state insertion, or there's something wrong in the pfsync state transfer. A full core dump might be helpful here, if this can be reproduced.

Yathus

@kprovost how can i have a full core dump ?

stephenw10

You can just set the ddb file to dump rather than textdump but you need enough SWAP space to dump to and 1GB probably isn't enough.

So you can reinstall with more swap space or add SWAP somehow. For example: https://forum.netgate.com/post/1127502

Yathus

@stephenw10 i add a second disk to VM and i have now a 12Go SWAP.

My config was :

#script kdb.enter.default=textdump set; capture on; run pfs ; capture off; textdump dump; reset

Replaced by :

script kdb.enter.default=bt ; show registers ; dump ; reset

I reboot too.

stephenw10

Great. You can check that it's working as expected by forcing a panic and seeing if the kernel core dump is created.

Running: sysctl debug.kdb.panic=1 will panic the system immediately and should create the core dump.

Steve

Yathus

@stephenw10 i test your command on my "backup" pfsense and it's worked, got a 1Go file vmcore.0
So we just have to wait now...