[ 15.047433] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.576004] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 21.844822] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 22.617677] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) [ 35.891827] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 41.262531] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) executing program [ 41.357907] kasan: CONFIG_KASAN_INLINE enabled [ 41.362689] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 41.375495] Dumping ftrace buffer: [ 41.379003] (ftrace buffer empty) [ 41.382684] Modules linked in: [ 41.385962] CPU: 1 PID: 3318 Comm: syzkaller559806 Not tainted 4.4.112-g5f6325b #28 [ 41.393727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.403053] task: ffff8801d0d117c0 task.stack: ffff8801d09f0000 [ 41.409076] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 41.417308] RSP: 0018:ffff8801d09f79f0 EFLAGS: 00010a07 [ 41.422723] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba72b [ 41.429969] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 41.437209] RBP: ffff8801d09f7a00 R08: 0000000000000001 R09: 0000000000000000 [ 41.444452] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 41.451692] R13: 0000000000000020 R14: ffff8800b4cc2100 R15: dffffc0000000000 [ 41.458933] FS: 0000000001c50880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 41.467139] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.472989] CR2: 0000000020ef0fe0 CR3: 00000000b484c000 CR4: 0000000000160670 [ 41.480232] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.487472] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.494716] Stack: [ 41.496834] 0000000000000000 ffff8800b4cc2258 ffff8801d09f7a60 ffffffff825ba751 [ 41.504815] ffff8800b4cc2270 ffffed001699844b ffffed001699844e ffff8800b4cc2268 [ 41.512796] dead4ead00000000 ffff8800b4cc2240 0000000000000000 0000000000000000 [ 41.520757] Call Trace: [ 41.523317] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 41.529780] [] sg_finish_rem_req+0x2b5/0x340 [ 41.535807] [] sg_new_read.isra.18+0x39/0x3c0 [ 41.541929] [] ? sg_get_rq_mark+0x142/0x190 [ 41.547870] [] sg_read+0x8c2/0x1490 [ 41.553115] [] ? __check_object_size+0x154/0x35b [ 41.559489] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 41.566123] [] ? fsnotify+0xee0/0xee0 [ 41.571550] [] ? avc_policy_seqno+0x9/0x20 [ 41.577419] [] do_loop_readv_writev+0x141/0x1e0 [ 41.583706] [] ? security_file_permission+0x89/0x1e0 [ 41.590427] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 41.597060] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 41.603694] [] do_readv_writev+0x5dd/0x6e0 [ 41.609545] [] ? vfs_write+0x530/0x530 [ 41.615050] [] ? handle_mm_fault+0xbf5/0x3190 [ 41.621166] [] ? _raw_spin_unlock+0x2c/0x50 [ 41.627107] [] ? handle_mm_fault+0x3f2/0x3190 [ 41.633230] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 41.640039] [] ? __fsnotify_parent+0xbc/0x340 [ 41.646154] [] ? avc_policy_seqno+0x9/0x20 [ 41.652008] [] vfs_readv+0x78/0xb0 [ 41.657166] [] SyS_readv+0xd9/0x240 [ 41.662423] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 41.668974] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 41.675527] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 41.682073] Code: 26 a6 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 [ 41.708666] RIP [] __free_pages+0x21/0x90 [ 41.714553] RSP [ 41.718349] ---[ end trace 043b9c5d51065e34 ]--- [ 41.723782] Kernel panic - not syncing: Fatal exception [ 41.729504] Dumping ftrace buffer: [ 41.733019] (ftrace buffer empty) [ 41.736698] Kernel Offset: disabled [ 41.740292] Rebooting in 86400 seconds..