[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.615625] random: sshd: uninitialized urandom read (32 bytes read) [ 35.972667] kauditd_printk_skb: 9 callbacks suppressed [ 35.972675] audit: type=1400 audit(1563592008.436:35): avc: denied { map } for pid=6862 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 36.018889] random: sshd: uninitialized urandom read (32 bytes read) [ 36.507547] random: sshd: uninitialized urandom read (32 bytes read) [ 36.701583] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. [ 42.238341] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.350156] audit: type=1400 audit(1563592014.806:36): avc: denied { map } for pid=6874 comm="syz-executor444" path="/root/syz-executor444989781" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 42.363931] netlink: 4 bytes leftover after parsing attributes in process `syz-executor444'. [ 42.386053] kasan: CONFIG_KASAN_INLINE enabled [ 42.390813] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.398192] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.404465] Modules linked in: [ 42.407656] CPU: 0 PID: 6874 Comm: syz-executor444 Not tainted 4.14.133 #28 [ 42.414780] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.424125] task: ffff888099bde080 task.stack: ffff888098f30000 [ 42.430265] RIP: 0010:tcf_ife_init+0x1b3/0x1310 [ 42.434928] RSP: 0018:ffff888098f37230 EFLAGS: 00010246 [ 42.440274] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1101337bd1e [ 42.447540] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000282 [ 42.454909] RBP: ffff888098f37378 R08: ffff888099bde080 R09: 0000000000000001 [ 42.462184] R10: 0000000000000000 R11: ffff888099bde080 R12: 000000000000001f [ 42.469445] R13: ffff888215d17680 R14: ffff888098f37350 R15: 0000000000000000 [ 42.476758] FS: 0000000000973880(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 [ 42.484984] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.491024] CR2: 0000000020000180 CR3: 0000000098626000 CR4: 00000000001406f0 [ 42.498292] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.505565] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.513194] Call Trace: [ 42.515775] ? tc_lookup_action_n+0xb2/0xd0 [ 42.520092] ? ife_get_meta_u32+0x150/0x150 [ 42.524408] ? lock_downgrade+0x6e0/0x6e0 [ 42.528541] ? _raw_read_unlock+0x2d/0x50 [ 42.532677] tcf_action_init_1+0x53c/0xaa0 [ 42.536895] ? tcf_action_dump_old+0x80/0x80 [ 42.541282] ? lock_downgrade+0x6e0/0x6e0 [ 42.545444] ? nla_parse+0x186/0x240 [ 42.549161] tcf_action_init+0x2ab/0x480 [ 42.553220] ? tcf_action_init_1+0xaa0/0xaa0 [ 42.557631] ? memset+0x32/0x40 [ 42.561051] ? nla_parse+0x186/0x240 [ 42.564756] tc_ctl_action+0x32f/0x556 [ 42.568745] ? tca_action_gd+0x840/0x840 [ 42.572807] ? tca_action_gd+0x840/0x840 [ 42.576915] rtnetlink_rcv_msg+0x3eb/0xb70 [ 42.581372] ? rtnl_bridge_getlink+0x7a0/0x7a0 [ 42.586041] ? trace_hardirqs_on+0x10/0x10 [ 42.590278] ? save_trace+0x290/0x290 [ 42.594149] netlink_rcv_skb+0x14f/0x3c0 [ 42.598325] ? rtnl_bridge_getlink+0x7a0/0x7a0 [ 42.602920] ? netlink_ack+0x9a0/0x9a0 [ 42.606803] ? lock_downgrade+0x6e0/0x6e0 [ 42.610938] rtnetlink_rcv+0x1d/0x30 [ 42.614941] netlink_unicast+0x45d/0x780 [ 42.619357] ? netlink_attachskb+0x6a0/0x6a0 [ 42.623893] ? security_netlink_send+0x81/0xb0 [ 42.628477] netlink_sendmsg+0x7c4/0xc60 [ 42.632616] ? netlink_unicast+0x780/0x780 [ 42.636927] ? security_socket_sendmsg+0x89/0xb0 [ 42.641672] ? netlink_unicast+0x780/0x780 [ 42.645898] sock_sendmsg+0xce/0x110 [ 42.649593] ___sys_sendmsg+0x70a/0x840 [ 42.653549] ? copy_msghdr_from_user+0x3f0/0x3f0 [ 42.658307] ? _raw_spin_unlock+0x2d/0x50 [ 42.662531] ? do_huge_pmd_anonymous_page+0x2fc/0x1470 [ 42.667802] ? __thp_get_unmapped_area+0x130/0x130 [ 42.672718] ? __handle_mm_fault+0x6a1/0x3470 [ 42.677196] ? save_trace+0x290/0x290 [ 42.680976] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 42.685880] ? __do_page_fault+0x4e9/0xb80 [ 42.690110] ? __fget_light+0x172/0x1f0 [ 42.694181] ? __fdget+0x1b/0x20 [ 42.697550] ? sockfd_lookup_light+0xb4/0x160 [ 42.702146] __sys_sendmsg+0xb9/0x140 [ 42.705933] ? SyS_shutdown+0x170/0x170 [ 42.710034] SyS_sendmsg+0x2d/0x50 [ 42.713565] ? __sys_sendmsg+0x140/0x140 [ 42.717613] do_syscall_64+0x1e8/0x640 [ 42.721641] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.726596] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.731850] RIP: 0033:0x4401d9 [ 42.735033] RSP: 002b:00007ffcced5df88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 42.742720] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 [ 42.750033] RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003 [ 42.757490] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 42.764995] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a60 [ 42.772304] R13: 0000000000401af0 R14: 0000000000000000 R15: 0000000000000000 [ 42.779720] Code: 76 fc 48 c7 c2 bb 01 e6 84 be 01 00 00 00 48 c7 c7 60 f5 78 87 e8 de 00 62 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 [ 42.798922] RIP: tcf_ife_init+0x1b3/0x1310 RSP: ffff888098f37230 [ 42.805903] ---[ end trace c254b31406c8686c ]--- [ 42.810757] Kernel panic - not syncing: Fatal exception [ 42.817889] Kernel Offset: disabled [ 42.821561] Rebooting in 86400 seconds..