[ 18.867040] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.551763] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 20.853247] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.683792] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 21.849654] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 27.255580] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.126851] kasan: CONFIG_KASAN_INLINE enabled [ 28.131327] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.144398] Dumping ftrace buffer: [ 28.147914] (ftrace buffer empty) [ 28.151598] Modules linked in: [ 28.154909] CPU: 0 PID: 3994 Comm: syzkaller556106 Not tainted 4.4.115-g6b8924e #10 [ 28.162673] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.171999] task: ffff8800b9cd6000 task.stack: ffff8801d7bc8000 [ 28.178033] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.187032] RSP: 0018:ffff8801d7bcfa40 EFLAGS: 00010a07 [ 28.192455] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 28.199697] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.206939] RBP: ffff8801d7bcfa50 R08: 0000000000000000 R09: 0000000000000000 [ 28.214180] R10: 0000000000000000 R11: 1ffff1003af79f26 R12: 0000000000000004 [ 28.221424] R13: 0000000000000020 R14: ffff8800b9d98000 R15: dffffc0000000000 [ 28.228668] FS: 00007f9a5ef77700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.236865] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.242717] CR2: 0000000020dc8000 CR3: 00000001d9066000 CR4: 0000000000160670 [ 28.249961] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.257225] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.264466] Stack: [ 28.266588] ffffffff83775129 ffff8800b9d98158 ffff8801d7bcfab0 ffffffff825b8751 [ 28.274571] ffff8800b9d98170 ffffed00173b302b ffffed00173b302e ffff8800b9d98168 [ 28.282550] dead4ead00000000 ffff8800b9d98140 0000000000000000 0000000000000000 [ 28.290548] Call Trace: [ 28.293113] [] ? retint_kernel+0x2d/0x2d [ 28.298820] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.305304] [] sg_finish_rem_req+0x2b5/0x340 [ 28.311338] [] sg_read+0xa1b/0x1490 [ 28.316598] [] ? __check_object_size+0x154/0x35b [ 28.322982] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.329625] [] ? fsnotify+0xee0/0xee0 [ 28.335054] [] ? avc_policy_seqno+0x9/0x20 [ 28.340916] [] do_loop_readv_writev+0x141/0x1e0 [ 28.347212] [] ? security_file_permission+0x89/0x1e0 [ 28.353941] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.360585] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.367227] [] do_readv_writev+0x5dd/0x6e0 [ 28.373084] [] ? vfs_write+0x530/0x530 [ 28.378598] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.384566] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.391555] [] ? __fget+0x20b/0x3b0 [ 28.396818] [] ? __fget+0x232/0x3b0 [ 28.402071] [] ? __fget+0x47/0x3b0 [ 28.407233] [] vfs_readv+0x78/0xb0 [ 28.412395] [] SyS_readv+0xd9/0x240 [ 28.417646] [] ? rw_copy_check_uvector+0x2b0/0x2b0 executing program [ 28.424198] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.430762] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.437311] Code: c6 9f 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 28.464042] RIP [] __free_pages+0x21/0x90 [ 28.469939] RSP [ 28.478390] ---[ end trace 887481b0b1521da8 ]--- [ 28.483201] Kernel panic - not syncing: Fatal exception [ 28.489057] Dumping ftrace buffer: [ 28.492575] (ftrace buffer empty) [ 28.496255] Kernel Offset: disabled [ 28.499850] Rebooting in 86400 seconds..