[ 16.750100] random: sshd: uninitialized urandom read (32 bytes read, 31 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: [ 22.171461] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.477802] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.373310] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 26.608176] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. [ 31.985957] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program [ 32.083812] kasan: CONFIG_KASAN_INLINE enabled [ 32.088256] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.101486] Dumping ftrace buffer: [ 32.105026] (ftrace buffer empty) [ 32.108720] Modules linked in: [ 32.112017] CPU: 1 PID: 3322 Comm: syzkaller798065 Not tainted 4.4.111-g3301b55 #24 [ 32.119780] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.129120] task: ffff8801d1964740 task.stack: ffff8800b4bb0000 [ 32.135148] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.143419] RSP: 0018:ffff8800b4bb79f0 EFLAGS: 00010a07 [ 32.148840] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 32.156082] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.163327] RBP: ffff8800b4bb7a00 R08: 0000000000000001 R09: 0000000000000000 [ 32.170566] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 32.177811] R13: 0000000000000020 R14: ffff8800b4610000 R15: dffffc0000000000 [ 32.185051] FS: 00000000019d8880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.193245] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.199091] CR2: 0000000020ef0fe0 CR3: 00000000b830a000 CR4: 0000000000160670 [ 32.206337] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.213574] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.220815] Stack: [ 32.222930] 0000000000000000 ffff8800b4610158 ffff8800b4bb7a60 ffffffff825b9ee1 [ 32.230876] ffff8800b4610170 ffffed00168c202b ffffed00168c202e ffff8800b4610168 [ 32.238827] dead4ead00000000 ffff8800b4610140 0000000000000000 0000000000000000 [ 32.246788] Call Trace: [ 32.249348] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 32.255809] [] sg_finish_rem_req+0x2b5/0x340 [ 32.261838] [] sg_new_read.isra.18+0x39/0x3c0 [ 32.267947] [] ? sg_get_rq_mark+0x142/0x190 [ 32.273885] [] sg_read+0x8c2/0x1490 [ 32.279133] [] ? __check_object_size+0x154/0x35b [ 32.285508] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.292144] [] ? fsnotify+0xee0/0xee0 [ 32.297565] [] ? avc_policy_seqno+0x9/0x20 [ 32.303423] [] do_loop_readv_writev+0x141/0x1e0 [ 32.309707] [] ? security_file_permission+0x89/0x1e0 [ 32.316437] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.323077] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.329712] [] do_readv_writev+0x5dd/0x6e0 [ 32.335563] [] ? vfs_write+0x530/0x530 [ 32.341674] [] ? handle_mm_fault+0xbf5/0x3190 [ 32.347788] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.353731] [] ? handle_mm_fault+0x3f2/0x3190 [ 32.359848] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.366660] [] ? __fsnotify_parent+0xbc/0x340 [ 32.372779] [] ? avc_policy_seqno+0x9/0x20 [ 32.378631] [] vfs_readv+0x78/0xb0 [ 32.383785] [] SyS_readv+0xd9/0x240 [ 32.389025] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 32.395579] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.402131] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 32.408675] 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 [ 32.434993] RIP [] __free_pages+0x21/0x90 [ 32.440876] RSP [ 32.444594] ---[ end trace a4c90d63a99c4d1d ]--- [ 32.449340] Kernel panic - not syncing: Fatal exception [ 32.455194] Dumping ftrace buffer: [ 32.458705] (ftrace buffer empty) [ 32.462381] Kernel Offset: disabled [ 32.465972] Rebooting in 86400 seconds..