[....] Starting file context maintaining daemon: 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: [ 20.880917] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.124145] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.985193] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) [ 22.143929] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 22.263556] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts. [ 27.633985] IPVS: Creating netns size=2552 id=1 [ 27.656208] IPVS: Creating netns size=2552 id=2 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.677844] IPVS: Creating netns size=2552 id=3 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.727914] IPVS: Creating netns size=2552 id=4 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.818592] IPVS: Creating netns size=2552 id=5 [ 27.820038] kasan: CONFIG_KASAN_INLINE enabled [ 27.820045] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.820049] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.820054] Dumping ftrace buffer: [ 27.820059] (ftrace buffer empty) [ 27.820062] Modules linked in: [ 27.820070] CPU: 1 PID: 3681 Comm: syzkaller143567 Not tainted 4.4.115-g0e9bcc1 #11 [ 27.820073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.820077] task: ffff8800b2934800 task.stack: ffff8800ae590000 [ 27.820094] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.820097] RSP: 0018:ffff8800ae5979f0 EFLAGS: 00010a07 [ 27.820101] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 27.820104] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 27.820108] RBP: ffff8800ae597a00 R08: 0000000048000000 R09: 0000000000001e30 [ 27.820111] R10: 0000000000002100 R11: 1ffff10015cb2f1c R12: 0000000000000004 [ 27.820115] R13: 0000000000000020 R14: ffff8801d9124200 R15: dffffc0000000000 [ 27.820120] FS: 00007f7b8d339700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.820124] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.820127] CR2: 0000000020a13000 CR3: 00000001ce822000 CR4: 0000000000160670 [ 27.820134] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.820137] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.820138] Stack: [ 27.820146] 0000000000000246 ffff8801d9124358 ffff8800ae597a60 ffffffff825b8751 [ 27.820153] ffff8801d9124370 ffffed003b22486b ffffed003b22486e ffff8801d9124368 [ 27.820160] dead4ead00000000 ffff8801d9124340 0000000000000000 0000000000000000 [ 27.820161] Call Trace: [ 27.820173] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.820179] [] sg_finish_rem_req+0x2b5/0x340 [ 27.820186] [] sg_new_read.isra.18+0x17d/0x3c0 [ 27.820192] [] sg_read+0x8bc/0x1490 [ 27.820202] [] ? __check_object_size+0x154/0x35b [ 27.820209] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.820216] [] ? fsnotify+0xee0/0xee0 [ 27.820226] [] ? avc_policy_seqno+0x9/0x20 [ 27.820234] [] do_loop_readv_writev+0x141/0x1e0 [ 27.820240] [] ? security_file_permission+0x89/0x1e0 [ 27.820247] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.820253] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.820258] [] do_readv_writev+0x5dd/0x6e0 [ 27.820263] [] ? vfs_write+0x530/0x530 [ 27.820276] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.820282] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.820290] [] ? __fget+0x20b/0x3b0 [ 27.820295] [] ? __fget+0x232/0x3b0 [ 27.820300] [] ? __fget+0x47/0x3b0 [ 27.820305] [] vfs_readv+0x78/0xb0 [ 27.820311] [] SyS_readv+0xd9/0x240 [ 27.820316] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 27.820325] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.820331] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.820421] Code: c6 9f 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 [ 27.820427] RIP [] __free_pages+0x21/0x90 [ 27.820429] RSP [ 27.827736] ---[ end trace 10dcc3d0f0ec225b ]--- [ 27.827741] Kernel panic - not syncing: Fatal exception [ 27.828323] Dumping ftrace buffer: [ 27.828326] (ftrace buffer empty) [ 27.828329] Kernel Offset: disabled [ 28.181650] Rebooting in 86400 seconds..