[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.153392] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.610602] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 20.928059] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.821985] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) [ 21.998840] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.15.242' (ECDSA) to the list of known hosts. [ 27.397093] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program [ 27.496518] kasan: CONFIG_KASAN_INLINE enabled [ 27.500960] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.514226] Dumping ftrace buffer: [ 27.517731] (ftrace buffer empty) [ 27.521408] Modules linked in: [ 27.524683] CPU: 1 PID: 3324 Comm: syzkaller077694 Not tainted 4.4.111-gf851888 #23 [ 27.532441] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.541764] task: ffff8801d12f8000 task.stack: ffff8800b4e60000 [ 27.547791] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.556023] RSP: 0018:ffff8800b4e679f0 EFLAGS: 00010a07 [ 27.561440] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 27.568678] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.575917] RBP: ffff8800b4e67a00 R08: 0000000000000001 R09: 0000000000000000 [ 27.583164] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.590403] R13: 0000000000000020 R14: ffff8801d18f2100 R15: dffffc0000000000 [ 27.597645] FS: 000000000189b880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.605838] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.611688] CR2: 0000000020ef0fe0 CR3: 00000001cd9f0000 CR4: 0000000000160670 [ 27.618928] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.626167] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.633419] Stack: [ 27.635534] 0000000000000000 ffff8801d18f2258 ffff8800b4e67a60 ffffffff825b9ec1 [ 27.643496] ffff8801d18f2270 ffffed003a31e44b ffffed003a31e44e ffff8801d18f2268 [ 27.651464] dead4ead00000000 ffff8801d18f2240 0000000000000000 0000000000000000 [ 27.659421] Call Trace: [ 27.661987] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.668450] [] sg_finish_rem_req+0x2b5/0x340 [ 27.674476] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.680610] [] ? sg_get_rq_mark+0x142/0x190 [ 27.686560] [] sg_read+0x8c2/0x1490 [ 27.691805] [] ? __check_object_size+0x154/0x35b [ 27.698177] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.704827] [] ? fsnotify+0xee0/0xee0 [ 27.710248] [] ? avc_policy_seqno+0x9/0x20 [ 27.716195] [] do_loop_readv_writev+0x141/0x1e0 [ 27.722490] [] ? security_file_permission+0x89/0x1e0 [ 27.729214] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.735847] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.742479] [] do_readv_writev+0x5dd/0x6e0 [ 27.748331] [] ? vfs_write+0x530/0x530 [ 27.753836] [] ? handle_mm_fault+0xbf5/0x3190 [ 27.759950] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.765896] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.772010] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.778816] [] ? __fsnotify_parent+0xbc/0x340 [ 27.784932] [] ? avc_policy_seqno+0x9/0x20 [ 27.790785] [] vfs_readv+0x78/0xb0 [ 27.795941] [] SyS_readv+0xd9/0x240 [ 27.801184] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.807734] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.814283] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.820825] 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 [ 27.847335] RIP [] __free_pages+0x21/0x90 [ 27.853224] RSP [ 27.860732] ---[ end trace 922165f5ebff8c7b ]--- [ 27.865956] Kernel panic - not syncing: Fatal exception [ 27.871816] Dumping ftrace buffer: [ 27.875330] (ftrace buffer empty) [ 27.879008] Kernel Offset: disabled [ 27.882600] Rebooting in 86400 seconds..