panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459
Starting stack trace...
panic(ffffffff834510ef) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff8348bb2c,ffffffff834a45f5,1cb,ffffffff83443957) at __assert+0x29 sys/kern/subr_prf.c:-1
pipex_unlink_session_locked(ffff80003c491c10) at pipex_unlink_session_locked+0x429
pipex_destroy_all_sessions(ffff800001616800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline]
pipex_destroy_all_sessions(ffff800001616800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151
pppacclose(637f,1,2000,ffff80003c476560) at pppacclose+0x16f sys/net/if_pppx.c:1335
spec_close(ffff80002a3209d0) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd805df9d710,1,fffffd80097fd548,ffff80003c476560) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806c9bbc98,ffff80003c476560) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806c9bbc98,ffff80003c476560) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806c9bbc98,ffff80003c476560) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd806c9bbc98,ffff80003c476560) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff80003c476560) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff80003c476560,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff80003c476560,ffff80002a320d40,ffff80002a320c90) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a320d40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a320d40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7a8e0e7cfaa0, count: 242
End of stack trace.