[ 19.707598] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 21.282991] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.585943] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.476372] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 35.393400] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.893829] kasan: CONFIG_KASAN_INLINE enabled [ 49.899800] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.924533] Dumping ftrace buffer: [ 49.928041] (ftrace buffer empty) [ 49.931725] Modules linked in: [ 49.935003] CPU: 1 PID: 4153 Comm: syzkaller811712 Not tainted 4.4.115-g55a366596 #14 [ 49.942937] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.952267] task: ffff8800aa3b3000 task.stack: ffff8801c40d0000 [ 49.958292] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 49.966613] RSP: 0018:ffff8801c40d7a40 EFLAGS: 00010a07 [ 49.972033] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b870b [ 49.979280] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 49.986521] RBP: ffff8801c40d7a50 R08: 0000000000000000 R09: 0000000000000000 [ 49.993762] R10: 0000000000000000 R11: 1ffff1003881af26 R12: 0000000000000004 [ 50.001002] R13: 0000000000000020 R14: ffff8801d8b18000 R15: dffffc0000000000 [ 50.008253] FS: 000000000230b880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 50.016449] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.022298] CR2: 00007f083667e000 CR3: 00000001cc62e000 CR4: 0000000000160670 [ 50.029549] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.036788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.044027] Stack: [ 50.046143] ffffffff837750e9 ffff8801d8b18158 ffff8801c40d7ab0 ffffffff825b8731 [ 50.054114] ffff8801d8b18170 ffffed003b16302b ffffed003b16302e ffff8801d8b18168 [ 50.062090] dead4ead00000000 ffff8801d8b18140 0000000000000000 0000000000000000 [ 50.070056] Call Trace: [ 50.072613] [] ? retint_kernel+0x2d/0x2d [ 50.078296] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 50.084762] [] sg_finish_rem_req+0x2b5/0x340 [ 50.090790] [] sg_read+0xa1b/0x1490 [ 50.096039] [] ? __check_object_size+0x154/0x35b [ 50.102413] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 50.109048] [] ? fsnotify+0xee0/0xee0 [ 50.114472] [] ? avc_policy_seqno+0x9/0x20 [ 50.120329] [] do_loop_readv_writev+0x141/0x1e0 [ 50.126616] [] ? security_file_permission+0x89/0x1e0 [ 50.133337] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 50.139970] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 50.146698] [] do_readv_writev+0x5dd/0x6e0 [ 50.152558] [] ? vfs_write+0x530/0x530 [ 50.158065] [] ? _raw_spin_unlock+0x2c/0x50 [ 50.164010] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 50.170997] [] ? handle_mm_fault+0x3f2/0x3190 [ 50.177112] [] ? __fsnotify_parent+0xbc/0x340 [ 50.183227] [] ? avc_policy_seqno+0x9/0x20 [ 50.189079] [] ? fsnotify+0x5ad/0xee0 [ 50.194513] [] ? __do_page_fault+0x290/0xa00 [ 50.200549] [] vfs_readv+0x78/0xb0 [ 50.205707] [] SyS_readv+0xd9/0x240 [ 50.210954] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 50.217505] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 50.224054] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 50.230600] 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 [ 50.257186] RIP [] __free_pages+0x21/0x90 [ 50.263077] RSP [ 50.266965] ---[ end trace 0b615c824de8bce8 ]--- [ 50.272937] Kernel panic - not syncing: Fatal exception [ 50.278656] Dumping ftrace buffer: [ 50.282173] (ftrace buffer empty) [ 50.285854] Kernel Offset: disabled [ 50.289449] Rebooting in 86400 seconds..