[ 20.087731] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.704206] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.155983] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.993822] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 26.158449] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 31.560974] random: nonblocking pool is initialized executing program [ 31.655203] kasan: CONFIG_KASAN_INLINE enabled [ 31.659996] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.672823] Dumping ftrace buffer: [ 31.676331] (ftrace buffer empty) [ 31.680011] Modules linked in: [ 31.683290] CPU: 1 PID: 3783 Comm: syzkaller569659 Not tainted 4.4.116-g17c7c49 #17 [ 31.691051] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.700378] task: ffff8801d97fc800 task.stack: ffff8800bb2e0000 [ 31.706402] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 31.714644] RSP: 0018:ffff8800bb2e79f0 EFLAGS: 00010a07 [ 31.720064] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b889b [ 31.727308] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 31.734551] RBP: ffff8800bb2e7a00 R08: 0000000000000000 R09: 0000000000000000 [ 31.741794] R10: 0000000000000000 R11: 1ffff1001765cf1e R12: 0000000000000004 [ 31.749049] R13: 0000000000000020 R14: ffff8800bb1b2100 R15: dffffc0000000000 [ 31.756295] FS: 0000000000b0b880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.764491] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.770347] CR2: 000000000043e5a0 CR3: 00000000af5b4000 CR4: 0000000000160670 [ 31.777594] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.784839] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.792079] Stack: [ 31.794196] 0000000000000000 ffff8800bb1b2258 ffff8800bb2e7a60 ffffffff825b88c1 [ 31.802163] ffff8800bb1b2270 ffffed001763644b ffffed001763644e ffff8800bb1b2268 [ 31.810150] dead4ead00000000 ffff8800bb1b2240 0000000000000000 0000000000000000 [ 31.818126] Call Trace: [ 31.820689] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 31.827152] [] sg_finish_rem_req+0x2b5/0x340 [ 31.833180] [] sg_new_read.isra.18+0x39/0x3c0 [ 31.839295] [] ? sg_get_rq_mark+0x142/0x190 [ 31.845244] [] sg_read+0x8bc/0x1490 [ 31.850495] [] ? __check_object_size+0x154/0x35b [ 31.856881] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 31.863519] [] ? fsnotify+0xee0/0xee0 [ 31.868946] [] ? avc_policy_seqno+0x9/0x20 [ 31.874807] [] do_loop_readv_writev+0x141/0x1e0 [ 31.881098] [] ? security_file_permission+0x89/0x1e0 [ 31.887833] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 31.894469] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 31.901106] [] do_readv_writev+0x5dd/0x6e0 [ 31.906957] [] ? vfs_write+0x530/0x530 [ 31.912470] [] ? sg_ioctl+0x29f0/0x29f0 [ 31.918077] [] ? __vfs_write+0x10b/0x450 [ 31.923760] [] ? __fsnotify_parent+0xbc/0x340 [ 31.929880] [] ? avc_policy_seqno+0x9/0x20 [ 31.935731] [] ? fsnotify+0x5ad/0xee0 [ 31.941150] [] ? fsnotify+0xee0/0xee0 [ 31.946573] [] ? rw_verify_area+0x100/0x2f0 [ 31.952515] [] vfs_readv+0x78/0xb0 [ 31.957673] [] SyS_readv+0xd9/0x240 [ 31.962930] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 31.969478] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.975948] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 31.982495] 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 [ 32.009045] RIP [] __free_pages+0x21/0x90 [ 32.014943] RSP [ 32.019348] ---[ end trace 2b837e26b4839452 ]--- [ 32.024100] Kernel panic - not syncing: Fatal exception [ 32.029906] Dumping ftrace buffer: [ 32.033421] (ftrace buffer empty) [ 32.037102] Kernel Offset: disabled [ 32.040698] Rebooting in 86400 seconds..