[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.379269] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.832426] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.142085] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.065553] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) [ 37.504237] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 42.947185] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.149869] 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 [ 43.188829] kasan: CONFIG_KASAN_INLINE enabled [ 43.194735] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 43.208585] Dumping ftrace buffer: [ 43.212096] (ftrace buffer empty) [ 43.215895] Modules linked in: [ 43.219178] CPU: 0 PID: 3738 Comm: syzkaller799567 Not tainted 4.4.124-g851fb4d #60 [ 43.226947] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.236280] task: ffff8800b7586000 task.stack: ffff8801d9020000 [ 43.242306] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 43.250539] RSP: 0018:ffff8801d9027b00 EFLAGS: 00010a07 [ 43.255955] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb03b [ 43.263195] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 43.270822] RBP: ffff8801d9027b10 R08: 0000000000000000 R09: 0000000000000001 [ 43.278068] R10: 0000000000000000 R11: 1ffff1003b204f3e R12: 0000000000000004 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.285311] R13: 0000000000000020 R14: ffff8800b719c200 R15: dffffc0000000000 [ 43.292557] FS: 00007f71e8197700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 43.300843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.306695] CR2: 00007f71e8175e78 CR3: 00000000ae8a4000 CR4: 0000000000160670 [ 43.313956] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.321207] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.328449] Stack: [ 43.330566] 0000000000000246 ffff8800b719c358 ffff8801d9027b70 ffffffff825bb061 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.338539] ffff8800b719c370 ffffed0016e3386b ffffed0016e3386e ffff8800b719c368 [ 43.346519] dead4ead00000000 ffff8800b719c340 0000000000000000 0000000000000000 [ 43.354489] Call Trace: [ 43.357048] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 43.363514] [] sg_finish_rem_req+0x2a6/0x320 [ 43.369553] [] sg_read+0xa32/0x14d0 [ 43.374816] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 43.381813] [] ? sg_proc_seq_show_debug+0xda0/0xda0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.388471] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 43.395468] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 43.402282] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 43.408918] [] __vfs_read+0x103/0x440 [ 43.414342] [] ? vfs_iter_write+0x2d0/0x2d0 [ 43.420289] [] ? fsnotify+0x5ad/0xee0 [ 43.425714] [] ? fsnotify+0xee0/0xee0 [ 43.431138] [] ? avc_policy_seqno+0x9/0x20 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.437002] [] ? selinux_file_permission+0x348/0x460 [ 43.443727] [] ? security_file_permission+0x89/0x1e0 [ 43.450449] [] ? rw_verify_area+0x100/0x2f0 [ 43.456390] [] vfs_read+0x123/0x3a0 [ 43.461636] [] SyS_read+0xd9/0x1b0 [ 43.466797] [] ? do_sendfile+0xd30/0xd30 [ 43.472625] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 43.479094] [] entry_SYSCALL_64_fastpath+0x22/0x9e executing program executing program executing program executing program executing program executing program executing program executing program [ 43.485644] 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 [ 43.512669] RIP [] __free_pages+0x21/0x90 [ 43.519792] RSP [ 43.523898] ---[ end trace 36c759e879e0262d ]--- [ 43.529578] Kernel panic - not syncing: Fatal exception [ 43.535525] Dumping ftrace buffer: [ 43.539053] (ftrace buffer empty) [ 43.542752] Kernel Offset: disabled [ 43.546363] Rebooting in 86400 seconds..