[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.340579] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.043676] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.423321] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.215873] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) [ 22.381983] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) Warning: Permanently added '10.128.15.202' (ECDSA) to the list of known hosts. [ 27.754562] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.047421] kasan: CONFIG_KASAN_INLINE enabled [ 29.051882] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.064677] Dumping ftrace buffer: [ 29.068182] (ftrace buffer empty) [ 29.071876] Modules linked in: [ 29.075149] CPU: 1 PID: 3327 Comm: syzkaller959233 Not tainted 4.4.110-g618a510 #15 [ 29.082904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.092232] task: ffff8800b5b0af80 task.stack: ffff8800b3e50000 [ 29.098253] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.106481] RSP: 0018:ffff8800b3e57970 EFLAGS: 00010a07 [ 29.111892] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 29.119128] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.126363] RBP: ffff8800b3e57980 R08: 0000000000000001 R09: 0000000000000001 [ 29.133597] R10: 0000000000000000 R11: 1ffff100167caf0c R12: 0000000000000004 [ 29.140833] R13: 0000000000000020 R14: ffff8800b05f8000 R15: dffffc0000000000 [ 29.148071] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008210840 [ 29.156267] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.162120] CR2: 0000000020dc8000 CR3: 00000000b6aec000 CR4: 0000000000160670 [ 29.169358] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.176599] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.183836] Stack: [ 29.185951] ffffffff83776229 ffff8800b05f8158 ffff8800b3e579e0 ffffffff825b9c81 [ 29.193895] ffff8800b05f8170 ffffed00160bf02b ffffed00160bf02e ffff8800b05f8168 [ 29.201843] dead4ead00000000 ffff8800b05f8140 0000000000000000 0000000000000000 [ 29.209791] Call Trace: [ 29.212346] [] ? retint_kernel+0x2d/0x2d [ 29.218022] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.224479] [] sg_finish_rem_req+0x2b5/0x340 [ 29.230503] [] sg_new_read.isra.18+0x336/0x3c0 [ 29.236706] [] sg_read+0x8c2/0x1490 [ 29.241956] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.248585] [] ? fsnotify+0xee0/0xee0 [ 29.254012] [] ? avc_policy_seqno+0x9/0x20 [ 29.259880] [] do_loop_readv_writev+0x141/0x1e0 [ 29.266188] [] ? security_file_permission+0x89/0x1e0 [ 29.273010] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.279643] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.286276] [] compat_do_readv_writev+0x5df/0x6e0 [ 29.292741] [] ? vfs_writev+0xb0/0xb0 [ 29.298159] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.304099] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.310215] [] ? rw_verify_area+0x100/0x2f0 [ 29.316156] [] compat_readv+0xd9/0x140 [ 29.321668] [] compat_SyS_readv+0xd8/0x1b0 [ 29.327529] [] ? SyS_pwritev+0x230/0x230 [ 29.333209] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.339404] [] ? SyS_pwritev+0x230/0x230 [ 29.345087] [] do_fast_syscall_32+0x314/0x890 [ 29.351197] [] sysenter_flags_fixed+0xd/0x17 [ 29.357222] Code: 96 a4 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 [ 29.383569] RIP [] __free_pages+0x21/0x90 [ 29.389458] RSP [ 29.393189] ---[ end trace d20b2285aef45942 ]--- [ 29.397950] Kernel panic - not syncing: Fatal exception [ 29.403751] Dumping ftrace buffer: [ 29.407268] (ftrace buffer empty) [ 29.410945] Kernel Offset: disabled [ 29.414544] Rebooting in 86400 seconds..