[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.295217] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.882307] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.256894] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.150043] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 32.200173] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 37.643915] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program [ 37.736731] kasan: CONFIG_KASAN_INLINE enabled [ 37.740286] kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.740301] Dumping ftrace buffer: [ 37.740304] (ftrace buffer empty) [ 37.740305] Modules linked in: [ 37.740312] CPU: 0 PID: 3795 Comm: syzkaller577707 Not tainted 4.4.120-gd63fdf6 #28 [ 37.740314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.740317] task: ffff8800bb134800 task.stack: ffff8800bba48000 [ 37.740319] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 37.740332] RSP: 0018:ffff8800bba4f9f0 EFLAGS: 00010a07 [ 37.740335] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 37.740337] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 37.740339] RBP: ffff8800bba4fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 37.740342] R10: 0000000000002100 R11: 1ffff10017749f1c R12: 0000000000000004 [ 37.740344] R13: 0000000000000020 R14: ffff8800bb3a0000 R15: dffffc0000000000 [ 37.740347] FS: 00007f4d676e3700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.740350] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.740352] CR2: 000000002085dff0 CR3: 00000000bb846000 CR4: 0000000000160670 [ 37.740356] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.740358] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.740359] Stack: [ 37.740361] 0000000000000246 ffff8800bb3a0158 ffff8800bba4fa60 ffffffff825b8611 [ 37.740366] ffff8800bb3a0170 ffffed001767402b ffffed001767402e ffff8800bb3a0168 [ 37.740370] dead4ead00000000 ffff8800bb3a0140 0000000000000000 0000000000000000 [ 37.740374] Call Trace: [ 37.740385] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 37.740389] [] sg_finish_rem_req+0x2b5/0x340 [ 37.740393] [] sg_new_read.isra.18+0x17d/0x3c0 [ 37.740397] [] sg_read+0x8bc/0x1490 [ 37.740403] [] ? __check_object_size+0x154/0x35b [ 37.740407] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 37.740413] [] ? fsnotify+0xee0/0xee0 [ 37.740420] [] ? avc_policy_seqno+0x9/0x20 [ 37.740425] [] do_loop_readv_writev+0x141/0x1e0 [ 37.740429] [] ? security_file_permission+0x89/0x1e0 [ 37.740433] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 37.740437] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 37.740440] [] do_readv_writev+0x5dd/0x6e0 [ 37.740443] [] ? vfs_write+0x530/0x530 [ 37.740449] [] ? _raw_spin_unlock+0x2c/0x50 [ 37.740455] [] ? __fget+0x213/0x3b0 [ 37.740458] [] ? __fget+0x23a/0x3b0 [ 37.740461] [] ? __fget+0x47/0x3b0 [ 37.740464] [] vfs_readv+0x78/0xb0 [ 37.740467] [] SyS_readv+0xd9/0x240 [ 37.740470] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 37.740475] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 37.740479] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 37.740481] 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 [ 37.740538] RIP [] __free_pages+0x21/0x90 [ 37.740542] RSP [ 37.740547] ---[ end trace 4df5f55d663f9080 ]--- [ 37.740550] Kernel panic - not syncing: Fatal exception [ 37.741515] Dumping ftrace buffer: [ 37.741516] (ftrace buffer empty) [ 37.741518] Kernel Offset: disabled [ 38.099150] Rebooting in 86400 seconds..