[ 16.681082] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.317405] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.608820] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.453296] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) [ 21.638033] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 27.043555] random: sshd: uninitialized urandom read (32 bytes read, 89 bits of entropy available) executing program [ 27.146139] device syz0 entered promiscuous mode [ 27.180984] ------------[ cut here ]------------ [ 27.185779] WARNING: CPU: 0 PID: 3326 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 27.194641] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=28 data_len=0 gso_size=8 gso_type=5 ip_summed=0 [ 27.205310] Kernel panic - not syncing: panic_on_warn set ... [ 27.205310] [ 27.212647] CPU: 0 PID: 3326 Comm: syzkaller442039 Not tainted 4.4.111-g7902639 #25 [ 27.220407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.229730] 0000000000000000 b59823b03a97138c ffff8801d05ef428 ffffffff81d0509d [ 27.237705] ffffffff83842f60 ffff8801d05ef500 ffffffff83ca9d60 0000000000000009 [ 27.245667] 0000000000000991 ffff8801d05ef4f0 ffffffff81419a3a 0000000041b58ab3 [ 27.253633] Call Trace: [ 27.256193] [] dump_stack+0xc1/0x124 [ 27.261528] [] panic+0x1aa/0x388 [ 27.266520] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.273416] [] ? warn_slowpath_common+0x10a/0x140 [ 27.280059] [] warn_slowpath_common+0x125/0x140 [ 27.286357] [] ? skb_warn_bad_offload+0x2af/0x390 [ 27.292826] [] warn_slowpath_fmt+0xc1/0x110 [ 27.298762] [] ? warn_slowpath_common+0x140/0x140 [ 27.305235] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.312131] [] ? ___ratelimit+0x53/0x3e0 [ 27.317808] [] skb_warn_bad_offload+0x2af/0x390 [ 27.324104] [] __skb_gso_segment+0x3b3/0x4a0 [ 27.330131] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 27.337727] [] validate_xmit_skb_list+0xae/0x110 [ 27.344115] [] sch_direct_xmit+0x34f/0x760 [ 27.349969] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 27.357559] [] __dev_queue_xmit+0x1368/0x1a70 [ 27.363677] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 27.369904] [] ? netdev_pick_tx+0x310/0x310 [ 27.375854] [] ? tun_select_queue+0x1c8/0x380 [ 27.381968] [] ? tun_chr_ioctl+0x40/0x40 [ 27.387646] [] ? tun_chr_ioctl+0x40/0x40 [ 27.393326] [] dev_queue_xmit+0x17/0x20 [ 27.398919] [] packet_sendmsg+0x29b2/0x47e0 [ 27.404865] [] ? avc_has_perm_noaudit+0x460/0x460 [ 27.411336] [] ? packet_cached_dev_get+0x200/0x200 [ 27.417893] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.424968] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.431440] [] ? security_socket_sendmsg+0x89/0xb0 [ 27.437997] [] ? packet_cached_dev_get+0x200/0x200 [ 27.444554] [] sock_sendmsg+0xca/0x110 [ 27.450069] [] sock_write_iter+0x226/0x3b0 [ 27.455922] [] ? avc_has_perm_noaudit+0x460/0x460 [ 27.462410] [] ? sock_sendmsg+0x110/0x110 [ 27.468207] [] ? iov_iter_init+0xaf/0x1d0 [ 27.473979] [] __vfs_write+0x33c/0x450 [ 27.479486] [] ? __vfs_read+0x440/0x440 [ 27.485078] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.491191] [] ? selinux_file_permission+0x348/0x460 [ 27.497914] [] ? rw_verify_area+0x100/0x2f0 [ 27.503851] [] vfs_write+0x18a/0x530 [ 27.509181] [] SyS_write+0xd9/0x1b0 [ 27.514433] [] ? SyS_read+0x1b0/0x1b0 [ 27.519850] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.526399] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.533391] Dumping ftrace buffer: [ 27.536936] (ftrace buffer empty) [ 27.540625] Kernel Offset: disabled [ 27.544249] Rebooting in 86400 seconds..