panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 953
Starting stack trace...
panic(ffffffff8333d6c5) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff83377da7,ffffffff833d9ea1,3b9,ffffffff833b418a) at __assert+0x29 sys/kern/subr_prf.c:-1
refcnt_finalize(ffff80003a5670b0,ffffffff83331d8c) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:954
pppx_if_destroy(0,ffff80003a5670a8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794
pppxclose(205b9a,1,2000,ffff800035935a28) at pppxclose+0xa0 sys/net/if_pppx.c:541
spec_close(ffff800037d41630) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd806fbbbbe8,1,fffffd8007bfb478,ffff800035935a28) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806bcf62e8,ffff800035935a28) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806bcf62e8,ffff800035935a28) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615
fdrop(fffffd806bcf62e8,ffff800035935a28) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd806bcf62e8,ffff800035935a28) at closef+0x190 sys/kern/kern_descrip.c:1264
syscall(ffff800037d41880) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff800037d41880) at syscall+0x962 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9f195555c0, count: 245
End of stack trace.