[....] Starting file context maintaining daemon:[ 21.316814] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.940262] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.417579] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.392571] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) [ 26.581613] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 30.254154] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program [ 32.111704] sg_write: data in/out 144144/315 bytes for SCSI command 0x6a-- guessing data in; [ 32.111704] program syzkaller545483 not setting count and/or reply_len properly [ 32.116746] sg_write: data in/out 144144/315 bytes for SCSI command 0x6a-- guessing data in; [ 32.116746] program syzkaller545483 not setting count and/or reply_len properly [ 32.118925] kasan: CONFIG_KASAN_INLINE enabled [ 32.118934] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.118938] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.118943] Dumping ftrace buffer: [ 32.118947] (ftrace buffer empty) [ 32.118950] Modules linked in: [ 32.118958] CPU: 1 PID: 3789 Comm: syzkaller545483 Not tainted 4.4.120-gd63fdf6 #28 [ 32.118961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.118965] task: ffff8800ab0e8000 task.stack: ffff8800b22b8000 [ 32.118981] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.118985] RSP: 0018:ffff8800b22bf9f0 EFLAGS: 00010a07 [ 32.118989] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 32.118992] RDX: 1bd5a9d5a0000003 RSI: 0000000000000005 RDI: dead4ead0000001c [ 32.118996] RBP: ffff8800b22bfa00 R08: 0000000048000000 R09: 0000000000001e30 [ 32.118999] R10: 0000000000002100 R11: 1ffff10016457f1c R12: 0000000000000004 [ 32.119002] R13: 0000000000000020 R14: ffff8800ab7b8000 R15: dffffc0000000000 [ 32.119008] FS: 00007f8137bb6700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.119011] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.119015] CR2: 000000002085dff0 CR3: 00000000add2e000 CR4: 0000000000160670 [ 32.119021] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.119025] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.119026] Stack: [ 32.119033] 0000000000000246 ffff8800ab7b8158 ffff8800b22bfa60 ffffffff825b8611 [ 32.119041] ffff8800ab7b8170 ffffed00156f702b ffffed00156f702e ffff8800ab7b8168 [ 32.119048] dead4ead00000000 ffff8800ab7b8140 0000000000000000 0000000000000000 [ 32.119049] Call Trace: [ 32.119062] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 32.119069] [] sg_finish_rem_req+0x2b5/0x340 [ 32.119075] [] sg_new_read.isra.18+0x17d/0x3c0 [ 32.119081] [] sg_read+0x8bc/0x1490 [ 32.119091] [] ? __check_object_size+0x154/0x35b [ 32.119097] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.119104] [] ? fsnotify+0xee0/0xee0 [ 32.119114] [] ? avc_policy_seqno+0x9/0x20 [ 32.119122] [] do_loop_readv_writev+0x141/0x1e0 [ 32.119129] [] ? security_file_permission+0x89/0x1e0 [ 32.119136] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.119142] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.119147] [] do_readv_writev+0x5dd/0x6e0 [ 32.119152] [] ? vfs_write+0x530/0x530 [ 32.119160] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.119167] [] ? __fget+0x213/0x3b0 [ 32.119172] [] ? __fget+0x23a/0x3b0 [ 32.119177] [] ? __fget+0x47/0x3b0 [ 32.119182] [] vfs_readv+0x78/0xb0 [ 32.119188] [] SyS_readv+0xd9/0x240 [ 32.119193] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 32.119201] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.119207] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 32.119292] 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 [ 32.119298] RIP [] __free_pages+0x21/0x90 [ 32.119300] RSP [ 32.119306] ---[ end trace e2c00774a08fe298 ]--- [ 32.119310] Kernel panic - not syncing: Fatal exception [ 32.128394] Dumping ftrace buffer: [ 32.128397] (ftrace buffer empty) [ 32.128400] Kernel Offset: disabled [ 32.496548] Rebooting in 86400 seconds..