[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [[ 17.163283] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) ....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.648203] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.966137] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.856548] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) [ 22.028598] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 27.440539] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.292472] random: nonblocking pool is initialized 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 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 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 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 executing program executing program executing program executing program executing program executing program [ 28.491022] kasan: CONFIG_KASAN_INLINE enabled [ 28.495445] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.508258] Dumping ftrace buffer: [ 28.511765] (ftrace buffer empty) [ 28.515440] Modules linked in: [ 28.518713] CPU: 1 PID: 3321 Comm: syzkaller667933 Not tainted 4.4.110-g618a510 #22 [ 28.526475] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.535805] task: ffff8801d1e497c0 task.stack: ffff8801d3328000 [ 28.541824] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.550049] RSP: 0018:ffff8801d332f9f0 EFLAGS: 00010a07 [ 28.555472] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 28.562705] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.569940] RBP: ffff8801d332fa00 R08: 0000000000000001 R09: 0000000000000001 [ 28.577175] R10: 0000000000000000 R11: 1ffff1003a665f1c R12: 0000000000000004 [ 28.584410] R13: 0000000000000020 R14: ffff8801d01e0000 R15: dffffc0000000000 [ 28.591645] FS: 00000000015c3940(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.599840] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.605691] CR2: 0000000020dc8000 CR3: 00000001d23ae000 CR4: 0000000000160670 [ 28.612934] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.620170] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.627409] Stack: [ 28.629520] ffffffff83776229 ffff8801d01e0158 ffff8801d332fa60 ffffffff825b9c81 [ 28.637462] ffff8801d01e0170 ffffed003a03c02b ffffed003a03c02e ffff8801d01e0168 [ 28.645408] dead4ead00000000 ffff8801d01e0140 0000000000000000 0000000000000000 [ 28.653350] Call Trace: [ 28.655904] [] ? retint_kernel+0x2d/0x2d [ 28.661581] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.668036] [] sg_finish_rem_req+0x2b5/0x340 [ 28.674060] [] sg_new_read.isra.18+0x336/0x3c0 [ 28.680256] [] sg_read+0x8c2/0x1490 [ 28.685497] [] ? __check_object_size+0x154/0x35b [ 28.691884] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.698519] [] ? fsnotify+0xee0/0xee0 [ 28.703949] [] ? avc_policy_seqno+0x9/0x20 [ 28.709803] [] do_loop_readv_writev+0x141/0x1e0 [ 28.716085] [] ? security_file_permission+0x89/0x1e0 [ 28.722803] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.729435] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.736064] [] do_readv_writev+0x5dd/0x6e0 [ 28.741913] [] ? vfs_write+0x530/0x530 [ 28.747414] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.753349] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.760328] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.766442] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.773245] [] ? __fsnotify_parent+0xbc/0x340 [ 28.779356] [] ? avc_policy_seqno+0x9/0x20 [ 28.785203] [] ? fsnotify+0x5ad/0xee0 [ 28.790616] [] vfs_readv+0x78/0xb0 [ 28.795777] [] SyS_readv+0xd9/0x240 [ 28.801025] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.807567] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.814109] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.820663] Code: 96 a4 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 [ 28.846968] RIP [] __free_pages+0x21/0x90 [ 28.852858] RSP [ 28.858510] ---[ end trace 26cb80728d1b111f ]--- [ 28.863267] Kernel panic - not syncing: Fatal exception [ 28.869060] Dumping ftrace buffer: [ 28.872573] (ftrace buffer empty) [ 28.876248] Kernel Offset: disabled [ 28.879840] Rebooting in 86400 seconds..