[ 18.503462] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] 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: [ 20.380498] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.576280] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.326756] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 21.488931] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 26.869333] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 26.951636] kasan: CONFIG_KASAN_INLINE enabled [ 26.956055] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.969247] Dumping ftrace buffer: [ 26.972758] (ftrace buffer empty) [ 26.976435] Modules linked in: [ 26.979712] CPU: 1 PID: 3777 Comm: syzkaller195010 Not tainted 4.4.115-g78d59f1 #12 [ 26.987470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.996791] task: ffff8800aa554800 task.stack: ffff8801d8c78000 [ 27.002815] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.011044] RSP: 0018:ffff8801d8c7fab0 EFLAGS: 00010a07 [ 27.016459] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b878b [ 27.023695] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.030932] RBP: ffff8801d8c7fac0 R08: 0000000000000000 R09: 0000000000000000 [ 27.038170] R10: 0000000000000000 R11: 1ffff1003b18ff34 R12: 0000000000000004 [ 27.045411] R13: 0000000000000020 R14: ffff8801d8ce0000 R15: dffffc0000000000 [ 27.052650] FS: 0000000002377880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.060841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.066691] CR2: 0000000020e7d000 CR3: 00000001d8c46000 CR4: 0000000000160670 [ 27.073931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.081169] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.088425] Stack: [ 27.090547] ffffffff83775169 ffff8801d8ce0158 ffff8801d8c7fb20 ffffffff825b87b1 [ 27.098521] ffff8801d8ce0170 ffffed003b19c02b ffffed003b19c02e ffff8801d8ce0168 [ 27.106481] dead4ead00000000 ffff8801d8ce0140 0000000000000000 0000000000000000 [ 27.114438] Call Trace: [ 27.116995] [] ? retint_kernel+0x2d/0x2d [ 27.122676] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.129134] [] sg_finish_rem_req+0x2b5/0x340 [ 27.135162] [] sg_new_read.isra.18+0x336/0x3c0 [ 27.141362] [] sg_read+0x8bc/0x1490 [ 27.146607] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.153242] [] ? debug_check_no_obj_freed+0x2d2/0x9b0 [ 27.160049] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.166945] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.173586] [] __vfs_read+0x103/0x440 [ 27.179006] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.184944] [] ? fsnotify+0x5ad/0xee0 [ 27.190359] [] ? fsnotify+0xee0/0xee0 [ 27.195789] [] ? avc_policy_seqno+0x9/0x20 [ 27.201643] [] ? selinux_file_permission+0x348/0x460 [ 27.208368] [] ? security_file_permission+0x89/0x1e0 [ 27.215090] [] ? rw_verify_area+0x100/0x2f0 [ 27.221030] [] vfs_read+0x123/0x3a0 [ 27.226272] [] SyS_read+0xd9/0x1b0 [ 27.231427] [] ? do_sendfile+0xd30/0xd30 [ 27.237107] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.243567] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.250109] 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 [ 27.276658] RIP [] __free_pages+0x21/0x90 [ 27.282549] RSP [ 27.286486] ---[ end trace 7a27c5ec0f2c01d7 ]--- [ 27.291251] Kernel panic - not syncing: Fatal exception [ 27.297050] Dumping ftrace buffer: [ 27.300562] (ftrace buffer empty) [ 27.304239] Kernel Offset: disabled [ 27.307833] Rebooting in 86400 seconds..