[ 18.609391] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.517401] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.889992] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.687042] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 35.247599] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.15.194' (ECDSA) to the list of known hosts. [ 40.782583] random: sshd: uninitialized urandom read (32 bytes read, 121 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 [ 41.104116] random: nonblocking pool is initialized [ 41.106273] kasan: CONFIG_KASAN_INLINE enabled [ 41.106280] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 41.106283] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 41.106287] Dumping ftrace buffer: [ 41.106290] (ftrace buffer empty) [ 41.106292] Modules linked in: [ 41.106298] CPU: 0 PID: 3799 Comm: syzkaller386399 Not tainted 4.4.115-g938ae27 #7 [ 41.106301] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.106304] task: ffff8801c5e1c800 task.stack: ffff8801c9888000 [ 41.106318] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 41.106320] RSP: 0018:ffff8801c988f9f0 EFLAGS: 00010a07 [ 41.106323] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 41.106326] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 41.106328] RBP: ffff8801c988fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 41.106330] R10: 0000000000002100 R11: 1ffff10039311f1c R12: 0000000000000004 [ 41.106332] R13: 0000000000000020 R14: ffff8801d20ec200 R15: dffffc0000000000 [ 41.106336] FS: 0000000000f3c940(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.106338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.106340] CR2: 000000002037e000 CR3: 00000001cb084000 CR4: 0000000000160670 [ 41.106345] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.106347] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.106348] Stack: [ 41.106353] 0000000000000246 ffff8801d20ec358 ffff8801c988fa60 ffffffff825b8751 [ 41.106357] ffff8801d20ec370 ffffed003a41d86b ffffed003a41d86e ffff8801d20ec368 [ 41.106361] dead4ead00000000 ffff8801d20ec340 0000000000000000 0000000000000000 [ 41.106362] Call Trace: [ 41.106372] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 41.106376] [] sg_finish_rem_req+0x2b5/0x340 [ 41.106380] [] sg_new_read.isra.18+0x17d/0x3c0 [ 41.106383] [] sg_read+0x8bc/0x1490 [ 41.106392] [] ? __check_object_size+0x154/0x35b [ 41.106396] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 41.106401] [] ? fsnotify+0xee0/0xee0 [ 41.106410] [] ? avc_policy_seqno+0x9/0x20 [ 41.106415] [] do_loop_readv_writev+0x141/0x1e0 [ 41.106419] [] ? security_file_permission+0x89/0x1e0 [ 41.106422] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 41.106426] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 41.106429] [] do_readv_writev+0x5dd/0x6e0 [ 41.106432] [] ? vfs_write+0x530/0x530 [ 41.106439] [] ? _raw_spin_unlock+0x2c/0x50 [ 41.106442] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 41.106449] [] ? handle_mm_fault+0x3f2/0x3190 [ 41.106452] [] ? __fsnotify_parent+0xbc/0x340 [ 41.106456] [] ? avc_policy_seqno+0x9/0x20 [ 41.106459] [] ? fsnotify+0x5ad/0xee0 [ 41.106467] [] ? __do_page_fault+0x290/0xa00 [ 41.106470] [] vfs_readv+0x78/0xb0 [ 41.106473] [] SyS_readv+0xd9/0x240 [ 41.106476] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 41.106482] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 41.106486] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 41.106536] Code: c6 9f 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 [ 41.106540] RIP [] __free_pages+0x21/0x90 [ 41.106541] RSP [ 41.106547] ---[ end trace ffa4fd62b94d95d5 ]--- [ 41.106550] Kernel panic - not syncing: Fatal exception [ 41.471563] Dumping ftrace buffer: [ 41.475120] (ftrace buffer empty) [ 41.478806] Kernel Offset: disabled [ 41.482412] Rebooting in 86400 seconds..