[ 21.285016] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.690432] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.175090] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 27.161879] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 27.331271] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 32.729228] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program [ 32.829776] kasan: CONFIG_KASAN_INLINE enabled [ 32.834399] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.847212] Dumping ftrace buffer: [ 32.850718] (ftrace buffer empty) [ 32.854395] Modules linked in: [ 32.857672] CPU: 1 PID: 3778 Comm: syzkaller475458 Not tainted 4.4.118-g239a415 #25 [ 32.865431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.874752] task: ffff8800abbdb000 task.stack: ffff8801d9940000 [ 32.880775] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.889026] RSP: 0018:ffff8801d99479f0 EFLAGS: 00010a07 [ 32.894441] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b855b [ 32.901679] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.908917] RBP: ffff8801d9947a00 R08: 0000000000000001 R09: 0000000000000001 [ 32.916155] R10: 0000000000000000 R11: 1ffff1003b328f1c R12: 0000000000000004 [ 32.923393] R13: 0000000000000020 R14: ffff8801c97b2100 R15: dffffc0000000000 [ 32.930631] FS: 0000000000d38880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.938921] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.944778] CR2: 000000000043e610 CR3: 00000000aed54000 CR4: 0000000000160670 [ 32.952019] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.959256] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.966501] Stack: [ 32.968617] 0000000000000246 ffff8801c97b2258 ffff8801d9947a60 ffffffff825b8581 [ 32.976580] ffff8801c97b2270 ffffed00392f644b ffffed00392f644e ffff8801c97b2268 [ 32.984545] dead4ead00000000 ffff8801c97b2240 0000000000000000 0000000000000000 [ 32.992510] Call Trace: [ 32.995121] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 33.001579] [] sg_finish_rem_req+0x2b5/0x340 [ 33.007603] [] sg_new_read.isra.18+0x336/0x3c0 [ 33.013801] [] sg_read+0x8bc/0x1490 [ 33.019049] [] ? __check_object_size+0x154/0x35b [ 33.025421] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.032056] [] ? fsnotify+0xee0/0xee0 [ 33.037476] [] ? avc_policy_seqno+0x9/0x20 [ 33.043329] [] do_loop_readv_writev+0x141/0x1e0 [ 33.049614] [] ? security_file_permission+0x89/0x1e0 [ 33.056334] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.062967] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.069602] [] do_readv_writev+0x5dd/0x6e0 [ 33.075455] [] ? vfs_write+0x530/0x530 [ 33.080960] [] ? sg_ioctl+0x29f0/0x29f0 [ 33.086553] [] ? __vfs_write+0x10b/0x450 [ 33.092232] [] ? quarantine_put+0xab/0x180 [ 33.098083] [] ? putname+0xee/0x130 [ 33.103327] [] ? rw_verify_area+0x100/0x2f0 [ 33.109265] [] vfs_readv+0x78/0xb0 [ 33.114420] [] SyS_readv+0xd9/0x240 [ 33.119671] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 33.126216] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.132680] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.139223] Code: c6 a0 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 [ 33.166113] RIP [] __free_pages+0x21/0x90 [ 33.172000] RSP [ 33.177150] ---[ end trace 486ebd6c4252bfa1 ]--- [ 33.181899] Kernel panic - not syncing: Fatal exception [ 33.187680] Dumping ftrace buffer: [ 33.191193] (ftrace buffer empty) [ 33.194873] Kernel Offset: disabled [ 33.198466] Rebooting in 86400 seconds..