[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.529130] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.000994] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.187302] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.997914] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 21.153774] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 26.531009] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 26.621393] IPVS: Creating netns size=2552 id=1 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 26.688716] ip (3810) used greatest stack depth: 25112 bytes left 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" [ 26.742993] ip (3827) used greatest stack depth: 24872 bytes left 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.266520] random: nonblocking pool is initialized executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.641494] kasan: CONFIG_KASAN_INLINE enabled [ 28.645919] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.658770] Dumping ftrace buffer: [ 28.662279] (ftrace buffer empty) [ 28.665957] Modules linked in: [ 28.669234] CPU: 1 PID: 4492 Comm: syzkaller418757 Not tainted 4.4.115-g55a366596 #14 [ 28.677168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.686492] task: ffff8800ba3ae000 task.stack: ffff8800b9898000 [ 28.692514] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.700744] RSP: 0018:ffff8800b989fa40 EFLAGS: 00010a07 [ 28.706168] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b870b [ 28.713406] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 28.720644] RBP: ffff8800b989fa50 R08: 0000000000000000 R09: 0000000000000000 [ 28.727882] R10: 0000000000000000 R11: 1ffff10017313f26 R12: 0000000000000004 [ 28.735119] R13: 0000000000000020 R14: ffff8801d7eb2100 R15: dffffc0000000000 [ 28.742362] FS: 00007f94133c7700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.750556] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.756404] CR2: 0000000020adff12 CR3: 00000000b0dc4000 CR4: 0000000000160670 [ 28.763646] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.770886] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.778122] Stack: [ 28.780237] ffffffff837750e9 ffff8801d7eb2258 ffff8800b989fab0 ffffffff825b8731 [ 28.788202] ffff8801d7eb2270 ffffed003afd644b ffffed003afd644e ffff8801d7eb2268 [ 28.796166] dead4ead00000000 ffff8801d7eb2240 0000000000000000 0000000000000000 [ 28.804125] Call Trace: [ 28.806682] [] ? retint_kernel+0x2d/0x2d [ 28.812372] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.818833] [] sg_finish_rem_req+0x2b5/0x340 [ 28.824860] [] sg_read+0xa1b/0x1490 [ 28.830105] [] ? __check_object_size+0x154/0x35b [ 28.836491] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.843124] [] ? fsnotify+0xee0/0xee0 [ 28.848547] [] ? avc_policy_seqno+0x9/0x20 [ 28.854402] [] do_loop_readv_writev+0x141/0x1e0 [ 28.860688] [] ? security_file_permission+0x89/0x1e0 [ 28.867408] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.874042] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.880673] [] do_readv_writev+0x5dd/0x6e0 [ 28.886523] [] ? vfs_write+0x530/0x530 [ 28.892026] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.897964] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.904944] [] ? __fget+0x20b/0x3b0 [ 28.910186] [] ? __fget+0x232/0x3b0 [ 28.915429] [] ? __fget+0x47/0x3b0 [ 28.920587] [] vfs_readv+0x78/0xb0 [ 28.925742] [] SyS_readv+0xd9/0x240 [ 28.930986] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 28.937534] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.944081] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.950624] 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 [ 28.977116] RIP [] __free_pages+0x21/0x90 [ 28.983004] RSP [ 28.987320] ---[ end trace 23cf8d38d310ca63 ]--- [ 28.992083] Kernel panic - not syncing: Fatal exception [ 28.997895] Dumping ftrace buffer: [ 29.001401] (ftrace buffer empty) [ 29.005077] Kernel Offset: disabled [ 29.008668] Rebooting in 86400 seconds..