panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459
Starting stack trace...
panic(ffffffff83451c58) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff8348ceed,ffffffff834a9bd5,1cb,ffffffff83448634) at __assert+0x29 sys/kern/subr_prf.c:-1
pipex_unlink_session_locked(ffff800035bb7340) at pipex_unlink_session_locked+0x429
pipex_destroy_all_sessions(ffff80000165f000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline]
pipex_destroy_all_sessions(ffff80000165f000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151
pppacclose(637f,1,2000,ffff800035bb2028) at pppacclose+0x16f sys/net/if_pppx.c:1335
spec_close(ffff80003c46f760) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd805f68e1c0,1,fffffd80097fd618,ffff800035bb2028) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805ea016e0,ffff800035bb2028) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805ea016e0,ffff800035bb2028) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805ea016e0,ffff800035bb2028) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805ea016e0,ffff800035bb2028) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff800035bb2028) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff800035bb2028,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff800035bb2028,ffff80003c46fad0,ffff80003c46fa20) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c46fad0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c46fad0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d6b29569d10, count: 242
End of stack trace.
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