[ 15.373170] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 20.614901] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.884287] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.608905] random: sshd: uninitialized urandom read (32 bytes read, 88 bits of entropy available) [ 62.294072] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 67.692911] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 67.792089] kasan: CONFIG_KASAN_INLINE enabled [ 67.796525] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 67.809371] Dumping ftrace buffer: [ 67.812881] (ftrace buffer empty) [ 67.816564] Modules linked in: [ 67.819839] CPU: 1 PID: 3341 Comm: syzkaller439433 Not tainted 4.4.110-g618a510 #22 [ 67.827600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.836932] task: ffff8800b5252f80 task.stack: ffff8801cce80000 [ 67.842956] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 67.851190] RSP: 0018:ffff8801cce879f0 EFLAGS: 00010a07 [ 67.856608] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 67.863851] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 67.871090] RBP: ffff8801cce87a00 R08: 0000000000000001 R09: 0000000000000000 [ 67.878330] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 67.885571] R13: 0000000000000020 R14: ffff8801d050a100 R15: dffffc0000000000 [ 67.892814] FS: 0000000002185880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 67.901009] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.906874] CR2: 0000000020ef0fe0 CR3: 00000001cfc7c000 CR4: 0000000000160670 [ 67.914131] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 67.921383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 67.928621] Stack: [ 67.930737] 0000000000000000 ffff8801d050a258 ffff8801cce87a60 ffffffff825b9c81 [ 67.938706] ffff8801d050a270 ffffed003a0a144b ffffed003a0a144e ffff8801d050a268 [ 67.946659] dead4ead00000000 ffff8801d050a240 0000000000000000 0000000000000000 [ 67.954626] Call Trace: [ 67.957191] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 67.963654] [] sg_finish_rem_req+0x2b5/0x340 [ 67.969682] [] sg_new_read.isra.18+0x39/0x3c0 [ 67.975796] [] ? sg_get_rq_mark+0x142/0x190 [ 67.981735] [] sg_read+0x8c2/0x1490 [ 67.986986] [] ? __check_object_size+0x154/0x35b [ 67.993360] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 68.000010] [] ? fsnotify+0xee0/0xee0 [ 68.005433] [] ? avc_policy_seqno+0x9/0x20 [ 68.011285] [] do_loop_readv_writev+0x141/0x1e0 [ 68.017572] [] ? security_file_permission+0x89/0x1e0 [ 68.024297] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 68.030932] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 68.037568] [] do_readv_writev+0x5dd/0x6e0 [ 68.043420] [] ? vfs_write+0x530/0x530 [ 68.048927] [] ? handle_mm_fault+0xbf5/0x3190 [ 68.055044] [] ? _raw_spin_unlock+0x2c/0x50 [ 68.060983] [] ? handle_mm_fault+0x3f2/0x3190 [ 68.067111] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 68.073916] [] ? __fsnotify_parent+0xbc/0x340 [ 68.080033] [] ? avc_policy_seqno+0x9/0x20 [ 68.085900] [] vfs_readv+0x78/0xb0 [ 68.091058] [] SyS_readv+0xd9/0x240 [ 68.096302] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 68.102854] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 68.109404] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 68.115952] 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 [ 68.142296] RIP [] __free_pages+0x21/0x90 [ 68.148182] RSP [ 68.152430] ---[ end trace d77fb3182611ddaa ]--- [ 68.157168] Kernel panic - not syncing: Fatal exception [ 68.162907] Dumping ftrace buffer: [ 68.166431] (ftrace buffer empty) [ 68.170113] Kernel Offset: disabled [ 68.173708] Rebooting in 86400 seconds..