[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.185107] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.609832] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.860517] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.640363] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) [ 21.813179] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 27.200661] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.299099] sg_write: data in/out 36090/1 bytes for SCSI command 0x67-- guessing data in; [ 27.299099] program syzkaller159622 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.111575] random: nonblocking pool is initialized [ 30.113501] kasan: CONFIG_KASAN_INLINE enabled [ 30.113509] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.113513] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.113517] Dumping ftrace buffer: [ 30.113520] (ftrace buffer empty) [ 30.113523] Modules linked in: [ 30.113531] CPU: 1 PID: 3900 Comm: syzkaller159622 Not tainted 4.4.110-gdac1439 #20 [ 30.113534] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.113539] task: ffff8801ceabaf80 task.stack: ffff8801cfad8000 [ 30.113554] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 30.113557] RSP: 0018:ffff8801cfadf9f0 EFLAGS: 00010a07 [ 30.113561] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 30.113564] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 30.113568] RBP: ffff8801cfadfa00 R08: 0000000000000001 R09: 0000000000000000 [ 30.113571] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 30.113574] R13: 0000000000000020 R14: ffff8801ceb1a100 R15: dffffc0000000000 [ 30.113580] FS: 0000000000f82880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.113583] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.113587] CR2: 0000000020bb7000 CR3: 00000001cf8b2000 CR4: 0000000000160670 [ 30.113592] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.113596] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.113597] Stack: [ 30.113605] 0000000000000000 ffff8801ceb1a258 ffff8801cfadfa60 ffffffff825b9c81 [ 30.113612] ffff8801ceb1a270 ffffed0039d6344b ffffed0039d6344e ffff8801ceb1a268 [ 30.113619] dead4ead00000000 ffff8801ceb1a240 0000000000000000 0000000000000000 [ 30.113620] Call Trace: [ 30.113631] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 30.113638] [] sg_finish_rem_req+0x2b5/0x340 [ 30.113644] [] sg_new_read.isra.18+0x39/0x3c0 [ 30.113650] [] ? sg_get_rq_mark+0x142/0x190 [ 30.113656] [] sg_read+0x8c2/0x1490 [ 30.113665] [] ? __check_object_size+0x154/0x35b [ 30.113672] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.113678] [] ? fsnotify+0xee0/0xee0 [ 30.113688] [] ? avc_policy_seqno+0x9/0x20 [ 30.113695] [] do_loop_readv_writev+0x141/0x1e0 [ 30.113701] [] ? security_file_permission+0x89/0x1e0 [ 30.113708] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.113714] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 30.113721] [] do_readv_writev+0x5dd/0x6e0 [ 30.113727] [] ? vfs_write+0x530/0x530 [ 30.113734] [] ? _raw_spin_unlock+0x2c/0x50 [ 30.113740] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 30.113748] [] ? handle_mm_fault+0x3f2/0x3190 [ 30.113755] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 30.113760] [] ? __fsnotify_parent+0xbc/0x340 [ 30.113766] [] ? avc_policy_seqno+0x9/0x20 [ 30.113771] [] ? fsnotify+0x5ad/0xee0 [ 30.113778] [] vfs_readv+0x78/0xb0 [ 30.113783] [] SyS_readv+0xd9/0x240 [ 30.113789] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 30.113795] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 30.113801] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 30.113886] 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 [ 30.113892] RIP [] __free_pages+0x21/0x90 [ 30.113894] RSP [ 30.113899] ---[ end trace ea7cb7ab53aed65a ]--- [ 30.113903] Kernel panic - not syncing: Fatal exception [ 30.484415] Dumping ftrace buffer: [ 30.487938] (ftrace buffer empty) [ 30.491614] Kernel Offset: disabled [ 30.495205] Rebooting in 86400 seconds..