syzkaller login: [ 205.142025][ T2921] netlink: 4 bytes leftover after parsing attributes in process `dhcpcd'. [ 205.189399][ T2921] netlink: 4 bytes leftover after parsing attributes in process `dhcpcd'. [ 205.236199][ T2921] netlink: 4 bytes leftover after parsing attributes in process `dhcpcd'. Warning: Permanently added '[localhost]:65347' (ECDSA) to the list of known hosts. 1970/01/01 00:03:55 fuzzer started 1970/01/01 00:04:02 connecting to host at localhost:35427 1970/01/01 00:04:03 checking machine... 1970/01/01 00:04:03 checking revisions... executing program 1970/01/01 00:04:06 testing simple program... executing program executing program executing program executing program executing program executing program executing program [ 269.049603][ T3097] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000dc0 [ 269.052122][ T3097] Oops [#1] [ 269.052613][ T3097] Modules linked in: [ 269.053800][ T3097] CPU: 0 PID: 3097 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0 [ 269.055833][ T3097] Hardware name: riscv-virtio,qemu (DT) [ 269.056502][ T3097] epc : __kmalloc+0xce/0x388 [ 269.057213][ T3097] ra : __kmalloc+0x6e/0x388 [ 269.057810][ T3097] epc : ffffffff803e3568 ra : ffffffff803e3508 sp : ffffffe008487730 [ 269.058484][ T3097] gp : ffffffff83f967d8 tp : ffffffe00831df00 t0 : 0000000000000000 [ 269.059184][ T3097] t1 : 0000000000000001 t2 : 0000000000000000 s0 : ffffffe0084877d0 [ 269.059841][ T3097] s1 : ffffffe005602000 a0 : 0000000000000000 a1 : ffffffe008487b1c [ 269.060505][ T3097] a2 : 1ffffffff07aa51f a3 : 0000000000000dc0 a4 : 0000000000000000 [ 269.061158][ T3097] a5 : ffffffff82e4b390 a6 : 0000000000f00000 a7 : ffffffff8038ca52 [ 269.061829][ T3097] s2 : ffffffff83f96adc s3 : 0000000000000dc0 s4 : 0000000000000450 [ 269.062488][ T3097] s5 : ffffffff805a6e28 s6 : ffffffff83f9a0d0 s7 : 0000000000000000 [ 269.063627][ T3097] s8 : 0000000000000dc0 s9 : 0000000000000001 s10: 0000000000000000 [ 269.064692][ T3097] s11: 0000000000000000 t3 : 0bae864e963c2100 t4 : ffffffc401090ee5 [ 269.065430][ T3097] t5 : ffffffc401090ee6 t6 : ffffffe008487916 [ 269.066001][ T3097] status: 0000000000000120 badaddr: 0000000000000dc0 cause: 000000000000000d [ 269.066744][ T3097] [] __kmalloc+0xce/0x388 [ 269.067590][ T3097] [] kzalloc.constprop.0+0x24/0x2e [ 269.068281][ T3097] [] __register_sysctl_table+0x9c/0xc52 [ 269.068986][ T3097] [] register_net_sysctl+0x1ca/0x288 [ 269.069731][ T3097] [] __devinet_sysctl_register+0xfa/0x18a [ 269.070480][ T3097] [] devinet_sysctl_register+0x110/0x142 [ 269.071250][ T3097] [] inetdev_init+0x19e/0x398 [ 269.071921][ T3097] [] inetdev_event+0x820/0xe14 [ 269.072599][ T3097] [] notifier_call_chain+0xb8/0x188 [ 269.073648][ T3097] [] raw_notifier_call_chain+0x2a/0x38 [ 269.074712][ T3097] [] call_netdevice_notifiers_info+0x9e/0x10e [ 269.075523][ T3097] [] register_netdevice+0xa5e/0xbe0 [ 269.076234][ T3097] [] register_netdev+0x3a/0x5a [ 269.076927][ T3097] [] sit_init_net+0x27a/0x7d6 [ 269.077603][ T3097] [] ops_init+0x86/0x2d2 [ 269.078272][ T3097] [] setup_net+0x29a/0x5fe [ 269.078961][ T3097] [] copy_net_ns+0x21a/0x4c8 [ 269.079676][ T3097] [] create_new_namespaces+0x262/0x634 [ 269.080378][ T3097] [] unshare_nsproxy_namespaces+0xa2/0x138 [ 269.081111][ T3097] [] ksys_unshare+0x2dc/0x6ae [ 269.081784][ T3097] [] sys_unshare+0x1a/0x24 [ 269.082502][ T3097] [] ret_from_syscall+0x0/0x2 [ 269.084675][ T3097] ---[ end trace bfac5b0860123f30 ]--- [ 269.085538][ T3097] Kernel panic - not syncing: Fatal exception [ 269.086229][ T3097] SMP: stopping secondary CPUs [ 269.088031][ T3097] Rebooting in 86400 seconds.. VM DIAGNOSIS: 13:38:16 Registers: info registers vcpu 0 pc ffffffff800e7086 mhartid 0000000000000000 mstatus 00000000000001a0 mip 00000000000000a0 mie 000000000000022a mideleg 0000000000000222 medeleg 000000000000b109 mtvec 0000000080000540 stvec ffffffff80005004 mepc ffffffff80abdae0 sepc ffffffff803e3568 mcause 8000000000000007 scause 000000000000000d mtval 0000000000000000 stval 0000000000000dc0 x0/zero 0000000000000000 x1/ra ffffffff800e7082 x2/sp ffffffe0084871c0 x3/gp ffffffff83f967d8 x4/tp ffffffe00831df00 x5/t0 ffffffff852b2bc7 x6/t1 ffffffc401090e3e x7/t2 0000000000000000 x8/s0 ffffffe008487270 x9/s1 ffffffff83c49a08 x10/a0 0000000000000000 x11/a1 00000000000f0000 x12/a2 0000000000000002 x13/a3 ffffffff800e7082 x14/a4 ffffffe00831ef00 x15/a5 0000000000000000 x16/a6 0000000000f00000 x17/a7 ffffffe0084871f7 x18/s2 0000000000000050 x19/s3 0000000000000120 x20/s4 ffffffe008487298 x21/s5 ffffffe0084872b0 x22/s6 0000000000000047 x23/s7 ffffffe0084872a8 x24/s8 ffffffff83f9a0d0 x25/s9 ffffffe008487298 x26/s10 ffffffff83f96378 x27/s11 ffffffff83c49a08 x28/t3 000000000000004d x29/t4 ffffffc401090e3e x30/t5 ffffffc401090e3f x31/t6 ffffffe0084872d8 f0/ft0 0000000000000000 f1/ft1 0000000000000000 f2/ft2 0000000000000000 f3/ft3 0000000000000000 f4/ft4 0000000000000000 f5/ft5 0000000000000000 f6/ft6 0000000000000000 f7/ft7 0000000000000000 f8/fs0 0000000000000000 f9/fs1 0000000000000000 f10/fa0 0000000000000000 f11/fa1 0000000000000000 f12/fa2 0000000000000000 f13/fa3 0000000000000000 f14/fa4 0000000000000000 f15/fa5 0000000000000000 f16/fa6 0000000000000000 f17/fa7 0000000000000000 f18/fs2 0000000000000000 f19/fs3 0000000000000000 f20/fs4 0000000000000000 f21/fs5 0000000000000000 f22/fs6 0000000000000000 f23/fs7 0000000000000000 f24/fs8 0000000000000000 f25/fs9 0000000000000000 f26/fs10 0000000000000000 f27/fs11 0000000000000000 f28/ft8 0000000000000000 f29/ft9 0000000000000000 f30/ft10 0000000000000000 f31/ft11 0000000000000000 info registers vcpu 1 pc ffffffff803e8ba6 mhartid 0000000000000001 mstatus 00000000000001a0 mip 00000000000000a0 mie 000000000000020a mideleg 0000000000000222 medeleg 000000000000b109 mtvec 0000000080000540 stvec ffffffff80005004 mepc ffffffff8008769e sepc ffffffff8008769e mcause 8000000000000007 scause 8000000000000005 mtval 0000000000000000 stval 0000000000000000 x0/zero 0000000000000000 x1/ra ffffffff800c66e2 x2/sp ffffffe0057b3250 x3/gp ffffffff83f967d8 x4/tp ffffffe0057f97c0 x5/t0 0000000000046000 x6/t1 0000000000005b59 x7/t2 000000000000152b x8/s0 ffffffe0057b32e0 x9/s1 ffffffe0057f9880 x10/a0 ffffffe0057f9a08 x11/a1 0000000000000007 x12/a2 1ffffffc00aff343 x13/a3 0000000000000001 x14/a4 000000000000010a x15/a5 00000000000003ff x16/a6 0000000000f00000 x17/a7 ffffffff83c0b540 x18/s2 0000000000001e03 x19/s3 ffffffe0057f9a08 x20/s4 0000000000000001 x21/s5 0000000000000001 x22/s6 0000000000000001 x23/s7 0000000000001cf9 x24/s8 0000000000000007 x25/s9 ffffffe0057f9880 x26/s10 0000000000000007 x27/s11 ffffffff8014541c x28/t3 00000000fffff350 x29/t4 ffffffc7f0a5eb0d x30/t5 ffffffc7f0a5eb14 x31/t6 0000000000000004 f0/ft0 0000000000000000 f1/ft1 407e59107a28b555 f2/ft2 41152f0000000000 f3/ft3 40d975b8092de59f f4/ft4 4122792800000000 f5/ft5 40380b5d69bac77f f6/ft6 0000000000000000 f7/ft7 0000000000000000 f8/fs0 0000000000000000 f9/fs1 0000000000000000 f10/fa0 0000000000000000 f11/fa1 0000000000000000 f12/fa2 0000000000000000 f13/fa3 0000000000000000 f14/fa4 0000000000000000 f15/fa5 0000000000000000 f16/fa6 0000000000000000 f17/fa7 0000000000000000 f18/fs2 0000000000000000 f19/fs3 0000000000000000 f20/fs4 0000000000000000 f21/fs5 0000000000000000 f22/fs6 0000000000000000 f23/fs7 0000000000000000 f24/fs8 0000000000000000 f25/fs9 0000000000000000 f26/fs10 0000000000000000 f27/fs11 0000000000000000 f28/ft8 0000000000000000 f29/ft9 0000000000000000 f30/ft10 0000000000000000 f31/ft11 0000000000000000