[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.673907] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.356069] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.781744] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.576351] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) [ 32.606317] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) Warning: Permanently added '10.128.15.233' (ECDSA) to the list of known hosts. [ 37.953793] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) executing program [ 38.045149] kasan: CONFIG_KASAN_INLINE enabled [ 38.049586] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.062407] Dumping ftrace buffer: [ 38.065927] (ftrace buffer empty) [ 38.069608] Modules linked in: [ 38.072888] CPU: 1 PID: 3338 Comm: syzkaller358459 Not tainted 4.4.112-g3fc4284 #32 [ 38.080653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.090329] task: ffff8800b48e4740 task.stack: ffff8800b4340000 [ 38.096353] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 38.104585] RSP: 0018:ffff8800b4347ab0 EFLAGS: 00010a07 [ 38.110001] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba47b [ 38.117246] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 38.124484] RBP: ffff8800b4347ac0 R08: 0000000000000001 R09: 0000000000000000 [ 38.131721] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 38.138960] R13: 0000000000000020 R14: ffff8800b4232100 R15: dffffc0000000000 [ 38.146197] FS: 00000000007e5880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 38.154389] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.160237] CR2: 000000000043e530 CR3: 00000000b668e000 CR4: 0000000000160670 [ 38.167482] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.174718] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.181952] Stack: [ 38.184066] 0000000000000000 ffff8800b4232258 ffff8800b4347b20 ffffffff825ba4a1 [ 38.192023] ffff8800b4232270 ffffed001684644b ffffed001684644e ffff8800b4232268 [ 38.199995] dead4ead00000000 ffff8800b4232240 0000000000000000 0000000000000000 [ 38.207953] Call Trace: [ 38.210511] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 38.216967] [] sg_finish_rem_req+0x2b5/0x340 [ 38.222990] [] sg_new_read.isra.18+0x39/0x3c0 [ 38.229101] [] ? sg_get_rq_mark+0x142/0x190 [ 38.235045] [] sg_read+0x8c2/0x1490 [ 38.240292] [] ? save_stack_trace+0x26/0x50 [ 38.246233] [] ? save_stack+0x43/0xd0 [ 38.251650] [] ? kasan_slab_free+0x72/0xc0 [ 38.257500] [] ? kmem_cache_free+0xc7/0x320 [ 38.263437] [] ? do_sys_open+0x23a/0x4b0 [ 38.269116] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.275748] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 38.282555] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 38.289448] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.296078] [] __vfs_read+0x103/0x440 [ 38.301495] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 38.308390] [] ? vfs_iter_write+0x2d0/0x2d0 [ 38.314332] [] ? fsnotify+0x5ad/0xee0 [ 38.319750] [] ? fsnotify+0xee0/0xee0 [ 38.325170] [] ? avc_policy_seqno+0x9/0x20 [ 38.331022] [] ? selinux_file_permission+0x348/0x460 [ 38.337747] [] ? security_file_permission+0x89/0x1e0 [ 38.344471] [] ? rw_verify_area+0x100/0x2f0 [ 38.350412] [] vfs_read+0x123/0x3a0 [ 38.355656] [] SyS_read+0xd9/0x1b0 [ 38.360810] [] ? do_sendfile+0xd30/0xd30 [ 38.366490] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 38.372956] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 38.379498] Code: 26 a6 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 [ 38.405985] RIP [] __free_pages+0x21/0x90 [ 38.411866] RSP [ 38.415584] ---[ end trace 782673591e0db62c ]--- [ 38.420981] Kernel panic - not syncing: Fatal exception [ 38.426748] Dumping ftrace buffer: [ 38.430260] (ftrace buffer empty) [ 38.433939] Kernel Offset: disabled [ 38.437537] Rebooting in 86400 seconds..