[ 16.058400] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.153358] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.515731] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 23.336918] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 38.779555] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 44.153601] random: sshd: uninitialized urandom read (32 bytes read, 119 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 [ 44.503583] random: nonblocking pool is initialized [ 44.505950] kasan: CONFIG_KASAN_INLINE enabled [ 44.505957] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 44.505960] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 44.505963] Dumping ftrace buffer: [ 44.505965] (ftrace buffer empty) [ 44.505968] Modules linked in: [ 44.505973] CPU: 1 PID: 3331 Comm: syzkaller356860 Not tainted 4.4.107-g610c835 #12 [ 44.505975] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.505977] task: ffff8801d12297c0 task.stack: ffff8800b4fa0000 [ 44.505988] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 44.505990] RSP: 0018:ffff8800b4fa79f0 EFLAGS: 00010a07 [ 44.505992] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 44.505994] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 44.505997] RBP: ffff8800b4fa7a00 R08: 0000000000000001 R09: 0000000000000000 [ 44.505999] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 44.506001] R13: 0000000000000020 R14: ffff8801d5178000 R15: dffffc0000000000 [ 44.506004] FS: 0000000000920880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 44.506006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.506008] CR2: 0000000020a77fc0 CR3: 00000000b60ed000 CR4: 00000000001406e0 [ 44.506013] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.506015] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.506016] Stack: [ 44.506021] 0000000000000000 ffff8801d5178158 ffff8800b4fa7a60 ffffffff825b8cf1 [ 44.506025] ffff8801d5178170 ffffed003aa2f02b ffffed003aa2f02e ffff8801d5178168 [ 44.506029] dead4ead00000000 ffff8801d5178140 0000000000000000 0000000000000000 [ 44.506030] Call Trace: [ 44.506038] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 44.506042] [] sg_finish_rem_req+0x2b5/0x340 [ 44.506046] [] sg_new_read.isra.18+0x39/0x3c0 [ 44.506049] [] ? sg_get_rq_mark+0x142/0x190 [ 44.506053] [] sg_read+0x8c2/0x1490 [ 44.506060] [] ? __check_object_size+0x154/0x35b [ 44.506064] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 44.506068] [] ? fsnotify+0xee0/0xee0 [ 44.506075] [] ? avc_policy_seqno+0x9/0x20 [ 44.506079] [] do_loop_readv_writev+0x141/0x1e0 [ 44.506083] [] ? security_file_permission+0x89/0x1e0 [ 44.506087] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 44.506091] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 44.506094] [] do_readv_writev+0x5dd/0x6e0 [ 44.506098] [] ? vfs_write+0x530/0x530 [ 44.506103] [] ? _raw_spin_unlock+0x2c/0x50 [ 44.506107] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 44.506112] [] ? handle_mm_fault+0x3f2/0x3190 [ 44.506118] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 44.506122] [] vfs_readv+0x78/0xb0 [ 44.506125] [] SyS_readv+0xd9/0x240 [ 44.506128] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 44.506132] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 44.506136] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 44.506187] Code: 76 ae 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 [ 44.506191] RIP [] __free_pages+0x21/0x90 [ 44.506192] RSP [ 44.506196] ---[ end trace 8ba7b56ecc6cc21c ]--- [ 44.506199] Kernel panic - not syncing: Fatal exception [ 44.859041] Dumping ftrace buffer: [ 44.862576] (ftrace buffer empty) [ 44.866265] Kernel Offset: disabled [ 44.869863] Rebooting in 86400 seconds..