panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 951
Starting stack trace...
panic(ffffffff8333df58) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff8337ae08,ffffffff833d46d4,3b7,ffffffff833adced) at __assert+0x29 sys/kern/subr_prf.c:-1
refcnt_finalize(ffff80003c9bab50,ffffffff83337c3b) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952
pppx_if_destroy(205b9a,ffff80003c9bab48) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794
pppxclose(205b9a,1,2000,ffff8
0003c9cad30) at pppxclose+0xa0 sys/net/if_pppx.c:541
spec_close(ffff80003194b710) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd80658f86d0,1,fffffd8007bfb5b0,ffff80003c9cad30) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805fd23cb8,ffff80003c9cad30) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805fd23cb8,ffff80003c9cad30) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615
fdrop(fffffd805fd23cb8,ffff80003c9cad30) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd805fd23cb8,ffff80003c9cad30) at closef+0x190 sys/kern/kern_descrip.c:1264
fdfree(ffff80003c9cad30) at fdfree+0x115 sys/kern/kern_descrip.c:1195
exit1(ffff80003c9cad30,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff80003c9cad30,ffff80003194ba70,ffff80003194b9c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003194ba70) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003194ba70) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f066eaf00c0, count: 242
End of stack trace.
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