panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459
Starting stack trace...
panic(ffffffff833a643d) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff833ea289,ffffffff834008ff,1cb,ffffffff8339e417) at __assert+0x29 sys/kern/subr_prf.c:-1
pipex_unlink_session_locked(ffff80003c411c18) at pipex_unlink_session_locked+0x409
pipex_destroy_all_sessions(ffff80000148d800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline]
pipex_destroy_all_sessions(ffff80000148d800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151
pppacclose(637e,41,2000,ffff8000ffff2fa8) at pppacclose+0x16f sys/net/if_pppx.c:1335
spec_close(ffff80003c418fb0) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd806c9728d0,41,fffffd80097fd5b0,ffff8000ffff2fa8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd8079f26c70,ffff8000ffff2fa8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd8079f26c70,ffff8000ffff2fa8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd8079f26c70,ffff8000ffff2fa8) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd8079f26c70,ffff8000ffff2fa8) at closef+0x192 sys/kern/kern_descrip.c:1264
fdfree(ffff8000ffff2fa8) at fdfree+0x116 sys/kern/kern_descrip.c:1195
exit1(ffff8000ffff2fa8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffff2fa8,ffff80003c419320,ffff80003c419270) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c419320) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c419320) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7a0ca93b80b0, count: 242
End of stack trace.