[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.894696] 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: [ 21.967896] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.439949] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 23.324701] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 23.511281] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.15.243' (ECDSA) to the list of known hosts. [ 36.788949] random: sshd: uninitialized urandom read (32 bytes read, 125 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 37.158066] random: nonblocking pool is initialized [ 37.161984] kasan: CONFIG_KASAN_INLINE enabled [ 37.161990] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.161992] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.161996] Dumping ftrace buffer: [ 37.161998] (ftrace buffer empty) [ 37.162000] Modules linked in: [ 37.162005] CPU: 1 PID: 3334 Comm: syzkaller173155 Not tainted 4.4.112-g3fc4284 #32 [ 37.162008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.162010] task: ffff8801d1ebdf00 task.stack: ffff8800b4740000 [ 37.162022] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 37.162024] RSP: 0018:ffff8800b47479f0 EFLAGS: 00010a07 [ 37.162026] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba47b [ 37.162029] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 37.162031] RBP: ffff8800b4747a00 R08: 0000000000000001 R09: 0000000000000001 [ 37.162033] R10: 0000000000000000 R11: 1ffff100168e8f1c R12: 0000000000000004 [ 37.162035] R13: 0000000000000020 R14: ffff8800b38b4200 R15: dffffc0000000000 [ 37.162038] FS: 0000000000f32880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.162040] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.162042] CR2: 0000000020adff12 CR3: 00000000b7d42000 CR4: 0000000000160670 [ 37.162047] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.162049] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.162049] Stack: [ 37.162054] ffffffff83776de9 ffff8800b38b4358 ffff8800b4747a60 ffffffff825ba4a1 [ 37.162058] ffff8800b38b4370 ffffed001671686b ffffed001671686e ffff8800b38b4368 [ 37.162062] dead4ead00000000 ffff8800b38b4340 0000000000000000 0000000000000000 [ 37.162063] Call Trace: [ 37.162070] [] ? retint_kernel+0x2d/0x2d [ 37.162077] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 37.162081] [] sg_finish_rem_req+0x2b5/0x340 [ 37.162085] [] sg_new_read.isra.18+0x336/0x3c0 [ 37.162089] [] sg_read+0x8c2/0x1490 [ 37.162095] [] ? __check_object_size+0x154/0x35b [ 37.162099] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.162103] [] ? fsnotify+0xee0/0xee0 [ 37.162109] [] ? avc_policy_seqno+0x9/0x20 [ 37.162114] [] do_loop_readv_writev+0x141/0x1e0 [ 37.162118] [] ? security_file_permission+0x89/0x1e0 [ 37.162122] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.162126] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.162130] [] do_readv_writev+0x5dd/0x6e0 [ 37.162133] [] ? vfs_write+0x530/0x530 [ 37.162137] [] ? _raw_spin_unlock+0x2c/0x50 [ 37.162141] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 37.162148] [] ? handle_mm_fault+0x3f2/0x3190 [ 37.162154] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 37.162157] [] ? __fsnotify_parent+0xbc/0x340 [ 37.162160] [] ? avc_policy_seqno+0x9/0x20 [ 37.162163] [] ? fsnotify+0x5ad/0xee0 [ 37.162167] [] vfs_readv+0x78/0xb0 [ 37.162171] [] SyS_readv+0xd9/0x240 [ 37.162174] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 37.162178] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 37.162182] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 37.162230] 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 [ 37.162234] RIP [] __free_pages+0x21/0x90 [ 37.162235] RSP [ 37.162239] ---[ end trace 5739d92543d94636 ]--- [ 37.162242] Kernel panic - not syncing: Fatal exception [ 37.534148] Dumping ftrace buffer: [ 37.537688] (ftrace buffer empty) [ 37.541378] Kernel Offset: disabled [ 37.544980] Rebooting in 86400 seconds..