[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.583890] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.235633] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.486972] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.440011] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 31.673791] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 37.071552] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) executing program [ 37.164049] kasan: CONFIG_KASAN_INLINE enabled [ 37.168510] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.181351] Dumping ftrace buffer: [ 37.184861] (ftrace buffer empty) [ 37.188544] Modules linked in: [ 37.191827] CPU: 1 PID: 3754 Comm: syzkaller622204 Not tainted 4.4.120-gd63fdf6 #28 [ 37.199592] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.208944] task: ffff8801c9ef1800 task.stack: ffff8801cac08000 [ 37.214986] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 37.223233] RSP: 0018:ffff8801cac0fab0 EFLAGS: 00010a07 [ 37.228652] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 37.235892] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 37.243132] RBP: ffff8801cac0fac0 R08: 0000000000000001 R09: 0000000000000001 [ 37.250372] R10: 0000000000000000 R11: 1ffff10039581f34 R12: 0000000000000004 [ 37.257615] R13: 0000000000000020 R14: ffff8800bb902100 R15: dffffc0000000000 [ 37.264859] FS: 0000000000901880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.273056] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.278907] CR2: 0000000020000340 CR3: 00000000ace8e000 CR4: 0000000000160670 [ 37.286150] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.293391] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.300632] Stack: [ 37.302749] 0000000000000246 ffff8800bb902258 ffff8801cac0fb20 ffffffff825b8611 [ 37.310713] ffff8800bb902270 ffffed001772044b ffffed001772044e ffff8800bb902268 [ 37.318680] dead4ead00000000 ffff8800bb902240 0000000000000000 0000000000000000 [ 37.326646] Call Trace: [ 37.329325] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 37.335792] [] sg_finish_rem_req+0x2b5/0x340 [ 37.341820] [] sg_new_read.isra.18+0x336/0x3c0 [ 37.348020] [] sg_read+0x8bc/0x1490 [ 37.353268] [] ? __lock_is_held+0xa1/0xf0 [ 37.359037] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 37.365689] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 37.372674] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 37.379314] [] __vfs_read+0x103/0x440 [ 37.384736] [] ? vfs_iter_write+0x2d0/0x2d0 [ 37.390677] [] ? fsnotify+0x5ad/0xee0 [ 37.396096] [] ? fsnotify+0xee0/0xee0 [ 37.401516] [] ? avc_policy_seqno+0x9/0x20 [ 37.407373] [] ? selinux_file_permission+0x348/0x460 [ 37.414097] [] ? security_file_permission+0x89/0x1e0 [ 37.420818] [] ? rw_verify_area+0x100/0x2f0 [ 37.426757] [] vfs_read+0x123/0x3a0 [ 37.432001] [] SyS_read+0xd9/0x1b0 [ 37.437172] [] ? do_sendfile+0xd30/0xd30 [ 37.442854] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 37.449320] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 37.455880] Code: c6 a0 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 [ 37.482409] RIP [] __free_pages+0x21/0x90 [ 37.488307] RSP [ 37.492124] ---[ end trace 7ebe6a857165e2e7 ]--- [ 37.497750] Kernel panic - not syncing: Fatal exception [ 37.503506] Dumping ftrace buffer: [ 37.507023] (ftrace buffer empty) [ 37.510704] Kernel Offset: disabled [ 37.514301] Rebooting in 86400 seconds..