[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.518109] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.827153] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.221587] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.071062] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 33.664993] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. [ 39.354565] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) executing program [ 39.463042] kasan: CONFIG_KASAN_INLINE enabled [ 39.467461] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.480711] Dumping ftrace buffer: [ 39.484215] (ftrace buffer empty) [ 39.487891] Modules linked in: [ 39.491160] CPU: 0 PID: 3323 Comm: syzkaller989977 Not tainted 4.4.107-g610c835 #4 [ 39.498829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.508149] task: ffff8801d11e17c0 task.stack: ffff8801d0968000 [ 39.514169] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 39.522400] RSP: 0018:ffff8801d096f970 EFLAGS: 00010a07 [ 39.527810] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 39.535049] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 39.542284] RBP: ffff8801d096f980 R08: 0000000000000001 R09: 0000000000000000 [ 39.549521] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 39.556754] R13: 0000000000000020 R14: ffff8801d2274200 R15: dffffc0000000000 [ 39.563991] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008595840 [ 39.572182] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.578027] CR2: 0000000020ef0fe0 CR3: 00000001d0841000 CR4: 00000000001406f0 [ 39.585266] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.592502] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.599736] Stack: [ 39.601851] 0000000000000000 ffff8801d2274358 ffff8801d096f9e0 ffffffff825b8cf1 [ 39.609807] ffff8801d2274370 ffffed003a44e86b ffffed003a44e86e ffff8801d2274368 [ 39.617754] dead4ead00000000 ffff8801d2274340 0000000000000000 0000000000000000 [ 39.625700] Call Trace: [ 39.628252] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 39.634707] [] sg_finish_rem_req+0x2b5/0x340 [ 39.640730] [] sg_new_read.isra.18+0x39/0x3c0 [ 39.646841] [] ? sg_get_rq_mark+0x142/0x190 [ 39.652776] [] sg_read+0x8c2/0x1490 [ 39.658028] [] ? do_page_fault+0x27/0x30 [ 39.663704] [] ? page_fault+0x28/0x30 [ 39.669124] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.675755] [] ? fsnotify+0xee0/0xee0 [ 39.681172] [] ? avc_policy_seqno+0x9/0x20 [ 39.687023] [] do_loop_readv_writev+0x141/0x1e0 [ 39.693306] [] ? security_file_permission+0x89/0x1e0 [ 39.700023] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.706656] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.713297] [] compat_do_readv_writev+0x5df/0x6e0 [ 39.719763] [] ? vfs_writev+0xb0/0xb0 [ 39.725180] [] ? _raw_spin_unlock+0x2c/0x50 [ 39.731117] [] ? handle_mm_fault+0x3f2/0x3190 [ 39.737227] [] compat_readv+0xd9/0x140 [ 39.742728] [] compat_SyS_readv+0xd8/0x1b0 [ 39.748576] [] ? SyS_pwritev+0x230/0x230 [ 39.754260] [] ? do_fast_syscall_32+0xd7/0x890 [ 39.760464] [] ? SyS_pwritev+0x230/0x230 [ 39.766138] [] do_fast_syscall_32+0x314/0x890 [ 39.772253] [] sysenter_flags_fixed+0xd/0x17 [ 39.778276] Code: 76 ae 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 [ 39.804557] RIP [] __free_pages+0x21/0x90 [ 39.810436] RSP [ 39.817675] ---[ end trace e83ad0c8d80c9425 ]--- [ 39.822843] Kernel panic - not syncing: Fatal exception [ 39.828532] Dumping ftrace buffer: [ 39.832043] (ftrace buffer empty) [ 39.835720] Kernel Offset: disabled [ 39.839311] Rebooting in 86400 seconds..