[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.597571] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 17.821888] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 18.116613] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.977479] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 19.162655] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 24.543298] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 24.658225] sg_write: data in/out 36090/8 bytes for SCSI command 0x67-- guessing data in; [ 24.658225] program syzkaller676935 not setting count and/or reply_len properly executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 25.507125] random: nonblocking pool is initialized [ 25.512021] kasan: CONFIG_KASAN_INLINE enabled [ 25.512029] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.512034] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.512038] Dumping ftrace buffer: [ 25.512041] (ftrace buffer empty) [ 25.512044] Modules linked in: [ 25.512051] CPU: 1 PID: 3317 Comm: syzkaller676935 Not tainted 4.4.110-gdac1439 #20 [ 25.512054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.512058] task: ffff8800b50c8000 task.stack: ffff8800b6190000 [ 25.512072] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 25.512075] RSP: 0018:ffff8800b61979f0 EFLAGS: 00010a07 [ 25.512079] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 25.512083] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 25.512086] RBP: ffff8800b6197a00 R08: 0000000000000001 R09: 0000000000000000 [ 25.512089] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 25.512093] R13: 0000000000000020 R14: ffff8800b023c200 R15: dffffc0000000000 [ 25.512098] FS: 00000000017fd880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.512101] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.512105] CR2: 00000000205c0000 CR3: 00000001d5130000 CR4: 0000000000160670 [ 25.512111] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.512114] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.512115] Stack: [ 25.512123] 0000000000000000 ffff8800b023c358 ffff8800b6197a60 ffffffff825b9c81 [ 25.512130] ffff8800b023c370 ffffed001604786b ffffed001604786e ffff8800b023c368 [ 25.512136] dead4ead00000000 ffff8800b023c340 0000000000000000 0000000000000000 [ 25.512137] Call Trace: [ 25.512149] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 25.512156] [] sg_finish_rem_req+0x2b5/0x340 [ 25.512162] [] sg_new_read.isra.18+0x39/0x3c0 [ 25.512168] [] ? sg_get_rq_mark+0x142/0x190 [ 25.512175] [] sg_read+0x8c2/0x1490 [ 25.512183] [] ? __check_object_size+0x154/0x35b [ 25.512189] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 25.512195] [] ? fsnotify+0xee0/0xee0 [ 25.512206] [] ? avc_policy_seqno+0x9/0x20 [ 25.512213] [] do_loop_readv_writev+0x141/0x1e0 [ 25.512219] [] ? security_file_permission+0x89/0x1e0 [ 25.512226] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 25.512232] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 25.512239] [] do_readv_writev+0x5dd/0x6e0 [ 25.512245] [] ? vfs_write+0x530/0x530 [ 25.512251] [] ? _raw_spin_unlock+0x2c/0x50 [ 25.512258] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 25.512266] [] ? handle_mm_fault+0x3f2/0x3190 [ 25.512273] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.512278] [] ? __fsnotify_parent+0xbc/0x340 [ 25.512285] [] ? avc_policy_seqno+0x9/0x20 [ 25.512290] [] ? fsnotify+0x5ad/0xee0 [ 25.512297] [] vfs_readv+0x78/0xb0 [ 25.512302] [] SyS_readv+0xd9/0x240 [ 25.512307] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 25.512314] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 25.512320] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 25.512404] 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 [ 25.512410] RIP [] __free_pages+0x21/0x90 [ 25.512412] RSP [ 25.512418] ---[ end trace ccd826a9556b899b ]--- [ 25.512422] Kernel panic - not syncing: Fatal exception [ 25.879875] Dumping ftrace buffer: [ 25.883396] (ftrace buffer empty) [ 25.887070] Kernel Offset: disabled [ 25.890662] Rebooting in 86400 seconds..