panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951
Starting stack trace...
panic(ffffffff8346dc66) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff8341ac8e,ffffffff83420c3a,3b7,ffffffff83420cbd) at __assert+0x29 sys/kern/subr_prf.c:-1
refcnt_finalize(ffff80002a366f20,ffffffff833638ac) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952
pppx_if_destroy(0,ffff80002a366f18) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794
pppxclose(205b9a,1,2000,ffff80002a3
e94c0) at pppxclose+0xa0 sys/net/if_pppx.c:541
spec_close(ffff80003c48cf90) at spec_close+0x412 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd80766e67b0,1,fffffd80097fb4e0,ffff80002a3e94c0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806cc06c98,ffff80002a3e94c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806cc06c98,ffff80002a3e94c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806cc06c98,ffff80002a3e94c0) at fdrop+0x126 sys/kern/kern_descrip.c:1267
closef(fffffd806cc06c98,ffff80002a3e94c0) at closef+0x192 sys/kern/kern_descrip.c:1251
fdfree(ffff80002a3e94c0) at fdfree+0x116 sys/kern/kern_descrip.c:1182
exit1(ffff80002a3e94c0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215
sys_exit(ffff80002a3e94c0,ffff80003c48d300,ffff80003c48d250) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c48d300) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c48d300) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7dc84559cd10, count: 242
End of stack trace.
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