panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 951
Starting stack trace...
panic(ffffffff83430e1e) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff833df0e4,ffffffff8332f2db,3b7,ffffffff833e7e38) at __assert+0x29 sys/kern/subr_prf.c:-1
refcnt_finalize(ffff8000300fb0b0,ffffffff8332c7dc) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952
pppx_if_destroy(205b9a,ffff8000300fb0a8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806
pp
pxclose(205b9a,1,2000,ffff80002a7c2f78) at pppxclose+0xa0 sys/net/if_pppx.c:553
spec_close(ffff80003a123a40) at spec_close+0x412 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd8062f94638,1,fffffd8007bfb410,ffff80002a7c2f78) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156
vn_closefile(fffffd80740ff1f0,ffff80002a7c2f78) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd80740ff1f0,ffff80002a7c2f78) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615
fdrop(fffffd80740ff1f0,ffff80002a7c2f78) at fdrop+0x126 sys/kern/kern_descrip.c:1267
closef(fffffd80740ff1f0,ffff80002a7c2f78) at closef+0x18d sys/kern/kern_descrip.c:1251
fdfree(ffff80002a7c2f78) at fdfree+0x115 sys/kern/kern_descrip.c:1182
exit1(ffff80002a7c2f78,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215
sys_exit(ffff80002a7c2f78,ffff80003a123db0,ffff80003a123d00) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003a123db0) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a123db0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6ff29fedd490, count: 242
End of stack trace.
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