[ 16.212968] 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: [ 22.094783] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.328761] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.255957] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) [ 35.735624] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. executing program [ 41.212835] kasan: CONFIG_KASAN_INLINE enabled [ 41.217667] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 41.230504] Dumping ftrace buffer: [ 41.234010] (ftrace buffer empty) [ 41.237689] Modules linked in: [ 41.240966] CPU: 0 PID: 3329 Comm: syzkaller594587 Not tainted 4.4.107-g610c835 #4 [ 41.248647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.257967] task: ffff8800b5485f00 task.stack: ffff8800b4f98000 [ 41.263988] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 41.272219] RSP: 0018:ffff8800b4f9fa40 EFLAGS: 00010a07 [ 41.277634] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 41.284870] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 41.292107] RBP: ffff8800b4f9fa50 R08: 0000000000000001 R09: 0000000000000000 [ 41.299352] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 41.306588] R13: 0000000000000020 R14: ffff8800b416a100 R15: dffffc0000000000 [ 41.313825] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009055840 [ 41.322018] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 41.327863] CR2: 0000000020001000 CR3: 00000000b422e000 CR4: 00000000001406f0 [ 41.335108] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.342347] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.349584] Stack: [ 41.351697] 0000000000000000 ffff8800b416a258 ffff8800b4f9fab0 ffffffff825b8cf1 [ 41.359655] ffff8800b416a270 ffffed001682d44b ffffed001682d44e ffff8800b416a268 [ 41.368198] dead4ead00000000 ffff8800b416a240 0000000000000000 0000000000000000 [ 41.376144] Call Trace: [ 41.378706] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 41.385164] [] sg_finish_rem_req+0x2b5/0x340 [ 41.391188] [] sg_new_read.isra.18+0x39/0x3c0 [ 41.397297] [] ? sg_get_rq_mark+0x142/0x190 [ 41.403233] [] sg_read+0x8c2/0x1490 [ 41.408480] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 41.415632] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 41.422266] [] ? __lock_is_held+0xa1/0xf0 [ 41.428031] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 41.434668] [] __vfs_read+0x103/0x440 [ 41.440085] [] ? vfs_iter_write+0x2d0/0x2d0 [ 41.446022] [] ? fsnotify+0x5ad/0xee0 [ 41.451440] [] ? fsnotify+0xee0/0xee0 [ 41.456868] [] ? _raw_spin_unlock+0x2c/0x50 [ 41.462809] [] ? avc_policy_seqno+0x9/0x20 [ 41.468657] [] ? selinux_file_permission+0x348/0x460 [ 41.475373] [] ? security_file_permission+0x89/0x1e0 [ 41.482092] [] ? rw_verify_area+0x100/0x2f0 [ 41.488027] [] vfs_read+0x123/0x3a0 [ 41.493269] [] SyS_read+0xd9/0x1b0 [ 41.498425] [] ? do_sendfile+0xd30/0xd30 [ 41.504107] [] ? do_fast_syscall_32+0xd7/0x890 [ 41.510306] [] ? do_sendfile+0xd30/0xd30 [ 41.515980] [] do_fast_syscall_32+0x314/0x890 [ 41.522089] [] sysenter_flags_fixed+0xd/0x17 [ 41.528110] 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 [ 41.554439] RIP [] __free_pages+0x21/0x90 [ 41.560328] RSP [ 41.564744] ---[ end trace ba2cacb428692b30 ]--- [ 41.570095] Kernel panic - not syncing: Fatal exception [ 41.575768] Dumping ftrace buffer: [ 41.579283] (ftrace buffer empty) [ 41.582963] Kernel Offset: disabled [ 41.586559] Rebooting in 86400 seconds..