[ 16.659214] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 19.400716] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 19.613455] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 20.405937] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 20.584343] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 25.962456] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) executing program [ 26.055931] kasan: CONFIG_KASAN_INLINE enabled [ 26.060568] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.073368] Dumping ftrace buffer: [ 26.076871] (ftrace buffer empty) [ 26.080547] Modules linked in: [ 26.083816] CPU: 0 PID: 3309 Comm: syzkaller894650 Not tainted 4.4.107-g610c835 #12 [ 26.091572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.100893] task: ffff8800b50517c0 task.stack: ffff8800b1b18000 [ 26.106915] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.115147] RSP: 0018:ffff8800b1b1f9f0 EFLAGS: 00010a07 [ 26.120560] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 26.127798] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 26.135042] RBP: ffff8800b1b1fa00 R08: 0000000000000001 R09: 0000000000000000 [ 26.142283] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.149519] R13: 0000000000000020 R14: ffff8800b045c200 R15: dffffc0000000000 [ 26.156755] FS: 00000000017cf880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.164954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.170805] CR2: 0000000020f46000 CR3: 00000000b5359000 CR4: 00000000001406f0 [ 26.178042] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.185284] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.192521] Stack: [ 26.194633] 0000000000000000 ffff8800b045c358 ffff8800b1b1fa60 ffffffff825b8cf1 [ 26.202579] ffff8800b045c370 ffffed001608b86b ffffed001608b86e ffff8800b045c368 [ 26.210520] dead4ead00000000 ffff8800b045c340 0000000000000000 0000000000000000 [ 26.218485] Call Trace: [ 26.221044] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.227501] [] sg_finish_rem_req+0x2b5/0x340 [ 26.233524] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.239643] [] ? sg_get_rq_mark+0x142/0x190 [ 26.245588] [] sg_read+0x8c2/0x1490 [ 26.250830] [] ? __check_object_size+0x154/0x35b [ 26.257201] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.263829] [] ? fsnotify+0xee0/0xee0 [ 26.269245] [] ? avc_policy_seqno+0x9/0x20 [ 26.275095] [] do_loop_readv_writev+0x141/0x1e0 [ 26.281377] [] ? security_file_permission+0x89/0x1e0 [ 26.288110] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.294739] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.301379] [] do_readv_writev+0x5dd/0x6e0 [ 26.307228] [] ? vfs_write+0x530/0x530 [ 26.312733] [] ? handle_mm_fault+0xbf5/0x3190 [ 26.318856] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.324792] [] ? handle_mm_fault+0x3f2/0x3190 [ 26.330903] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.337711] [] vfs_readv+0x78/0xb0 [ 26.342873] [] SyS_readv+0xd9/0x240 [ 26.348115] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 26.354656] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 26.361201] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 26.367743] 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 [ 26.394041] RIP [] __free_pages+0x21/0x90 [ 26.399918] RSP [ 26.409706] ---[ end trace a433102cd30d7b2a ]--- [ 26.414475] Kernel panic - not syncing: Fatal exception [ 26.420273] Dumping ftrace buffer: [ 26.423784] (ftrace buffer empty) [ 26.427458] Kernel Offset: disabled [ 26.431048] Rebooting in 86400 seconds..