panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459
Starting stack trace...
panic(ffffffff833ade17) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff833ef332,ffffffff83403af6,1cb,ffffffff833a1aed) at __assert+0x29 sys/kern/subr_prf.c:-1
pipex_unlink_session_locked(ffff80002a7c5758) at pipex_unlink_session_locked+0x429
pipex_destroy_all_sessions(ffff800010fc3800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline]
pipex_destroy_all_sessions(ffff800010fc3800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151
pppacclose(637e,81,2000,ffff80003bfffa18) at pppacclose+0x16f sys/net/if_pppx.c:1335
spec_close(ffff800036fde390) at spec_close+0x417 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd806a5a3058,81,fffffd80097fd478,ffff80003bfffa18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806c56f890,ffff80003bfffa18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806c56f890,ffff80003bfffa18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806c56f890,ffff80003bfffa18) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd806c56f890,ffff80003bfffa18) at closef+0x192 sys/kern/kern_descrip.c:1264
syscall(ffff800036fde5f0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800036fde5f0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2b926481cd0, count: 245
End of stack trace.