[....] 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: [ 21.884027] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.227215] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.076943] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) [ 23.232184] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) [ 23.343139] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.219' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.383340] kasan: CONFIG_KASAN_INLINE enabled [ 29.388341] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.401241] Dumping ftrace buffer: [ 29.404749] (ftrace buffer empty) [ 29.408429] Modules linked in: [ 29.411712] CPU: 0 PID: 4005 Comm: syzkaller202250 Not tainted 4.4.115-g78d59f1 #12 [ 29.419473] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.428796] task: ffff8800b9d29800 task.stack: ffff8801d85b0000 [ 29.434821] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.443055] RSP: 0018:ffff8801d85b79f0 EFLAGS: 00010a07 [ 29.448482] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b878b [ 29.455722] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 29.462962] RBP: ffff8801d85b7a00 R08: 0000000000000000 R09: 0000000000000000 [ 29.470207] R10: 0000000000000000 R11: 1ffff1003b0b6f1e R12: 0000000000000004 [ 29.477450] R13: 0000000000000020 R14: ffff8800b9e20000 R15: dffffc0000000000 [ 29.484702] FS: 00007fa43b888700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.492897] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.498748] CR2: 00000000208c0000 CR3: 00000001c4e54000 CR4: 0000000000160670 [ 29.505990] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.513233] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.520473] Stack: [ 29.522594] 0000000000000000 ffff8800b9e20158 ffff8801d85b7a60 ffffffff825b87b1 [ 29.530566] ffff8800b9e20170 ffffed00173c402b ffffed00173c402e ffff8800b9e20168 [ 29.538547] dead4ead00000000 ffff8800b9e20140 0000000000000000 0000000000000000 [ 29.546525] Call Trace: [ 29.549086] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.555545] [] sg_finish_rem_req+0x2b5/0x340 [ 29.561580] [] sg_new_read.isra.18+0x39/0x3c0 [ 29.567696] [] ? sg_get_rq_mark+0x142/0x190 [ 29.573645] [] sg_read+0x8bc/0x1490 [ 29.578894] [] ? __check_object_size+0x154/0x35b [ 29.585269] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 29.591905] [] ? fsnotify+0xee0/0xee0 [ 29.597327] [] ? avc_policy_seqno+0x9/0x20 [ 29.603192] [] do_loop_readv_writev+0x141/0x1e0 [ 29.609484] [] ? security_file_permission+0x89/0x1e0 [ 29.616217] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 29.622853] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 29.629489] [] do_readv_writev+0x5dd/0x6e0 [ 29.635343] [] ? vfs_write+0x530/0x530 [ 29.640849] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.646791] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 29.653781] [] ? __fget+0x20b/0x3b0 [ 29.659027] [] ? __fget+0x232/0x3b0 [ 29.664281] [] ? __fget+0x47/0x3b0 [ 29.669446] [] vfs_readv+0x78/0xb0 [ 29.674603] [] SyS_readv+0xd9/0x240 [ 29.679848] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 29.686395] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 29.692944] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 29.699490] 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 [ 29.726042] RIP [] __free_pages+0x21/0x90 executing program [ 29.731928] RSP [ 29.740989] ---[ end trace ddaecf0c55277a63 ]--- [ 29.745738] Kernel panic - not syncing: Fatal exception [ 29.751464] Dumping ftrace buffer: [ 29.754977] (ftrace buffer empty) [ 29.758657] Kernel Offset: disabled [ 29.762251] Rebooting in 86400 seconds..