panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/pipex.c", line 459
Starting stack trace...
panic(ffffffff833786bc) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff833b2d5e,ffffffff83307e52,1cb,ffffffff8336ab22) at __assert+0x29 sys/kern/subr_prf.c:-1
pipex_unlink_session_locked(ffff80002a820438) at pipex_unlink_session_locked+0x409
pipex_destroy_all_sessions(ffff80000144f800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline]
pipex_destroy_all_sessions(ffff80000144f800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151
pppacclose(637e,41,2000,ffff80002a7bd770) at pppacclose+0x16f sys/net/if_pppx.c:1335
spec_close(ffff80003c959900) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd80624d0548,41,fffffd8007bfd5b0,ffff80002a7bd770) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806ce0b900,ffff80002a7bd770) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806ce0b900,ffff80002a7bd770) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615
fdrop(fffffd806ce0b900,ffff80002a7bd770) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd806ce0b900,ffff80002a7bd770) at closef+0x190 sys/kern/kern_descrip.c:1264
fdfree(ffff80002a7bd770) at fdfree+0x115 sys/kern/kern_descrip.c:1195
exit1(ffff80002a7bd770,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff80002a7bd770,ffff80003c959c60,ffff80003c959bb0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c959c60) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c959c60) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x73e4958d1e70, count: 242
End of stack trace.