[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.363842] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.006829] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.178321] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.288719] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 21.438264] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 26.927373] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program executing program executing program [ 27.015046] kasan: CONFIG_KASAN_INLINE enabled [ 27.019471] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.032517] Dumping ftrace buffer: [ 27.036030] (ftrace buffer empty) [ 27.039711] Modules linked in: [ 27.042990] CPU: 1 PID: 3698 Comm: syzkaller418695 Not tainted 4.4.125-g38f41ec #63 [ 27.046044] kasan: CONFIG_KASAN_INLINE enabled [ 27.055300] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.055301] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.071947] task: ffff8801cbb5c800 task.stack: ffff8801d4dc8000 [ 27.077973] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.086211] RSP: 0018:ffff8801d4dcf9e8 EFLAGS: 00010a07 [ 27.091626] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb1fb [ 27.098865] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 27.106106] RBP: ffff8801d4dcf9f8 R08: 0000000048000000 R09: 0000000000001e30 [ 27.113345] R10: 0000000000002100 R11: 1ffff1003a9b9f1a R12: 0000000000000004 [ 27.120585] R13: 0000000000000020 R14: ffff8801ca484200 R15: dffffc0000000000 [ 27.127825] FS: 00007f894431d700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.136018] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.141868] CR2: 0000000020e94000 CR3: 00000001cd9b2000 CR4: 0000000000160670 [ 27.149109] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.156347] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.163585] Stack: [ 27.165703] 0000000000000246 ffff8801ca484358 ffff8801d4dcfa58 ffffffff825bb221 [ 27.173673] ffff8801ca484370 ffffed003949086b ffffed003949086e ffff8801ca484368 [ 27.181646] dead4ead00000000 ffff8801ca484340 0000000000000000 0000000000000000 [ 27.189615] Call Trace: [ 27.192182] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.198645] [] sg_finish_rem_req+0x2a6/0x320 [ 27.204672] [] sg_new_read+0x18b/0x420 [ 27.210180] [] sg_read+0x8cf/0x14d0 [ 27.215426] [] ? __check_object_size+0x154/0x35b [ 27.221798] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.228434] [] ? fsnotify+0xee0/0xee0 [ 27.233852] [] ? avc_policy_seqno+0x9/0x20 [ 27.239705] [] do_loop_readv_writev+0x141/0x1e0 [ 27.246005] [] ? security_file_permission+0x89/0x1e0 [ 27.252729] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.259364] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.265996] [] do_readv_writev+0x5dd/0x6e0 [ 27.271848] [] ? vfs_write+0x530/0x530 [ 27.277356] [] ? sg_ioctl+0x2a00/0x2a00 [ 27.282949] [] ? __vfs_write+0x10b/0x450 [ 27.288626] [] ? quarantine_put+0xab/0x180 [ 27.294478] [] ? __fget+0x213/0x3b0 [ 27.299725] [] ? __fget+0x23a/0x3b0 [ 27.304968] [] ? __fget+0x47/0x3b0 [ 27.310126] [] vfs_readv+0x78/0xb0 [ 27.315284] [] SyS_readv+0xd9/0x240 [ 27.320528] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 27.327079] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.333542] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 27.340096] Code: c6 a0 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 [ 27.366732] RIP [] __free_pages+0x21/0x90 [ 27.372618] RSP [ 27.376221] general protection fault: 0000 [#2] [ 27.376550] ---[ end trace a4e74a4924bf2818 ]--- [ 27.376554] Kernel panic - not syncing: Fatal exception [ 27.390849] PREEMPT SMP KASAN [ 27.394580] Dumping ftrace buffer: [ 27.398093] (ftrace buffer empty) [ 27.401777] Modules linked in: [ 27.405066] CPU: 0 PID: 3699 Comm: syzkaller418695 Tainted: G D 4.4.125-g38f41ec #63 [ 27.414043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.423372] task: ffff8800afcc4800 task.stack: ffff8800af268000 [ 27.429578] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.437823] RSP: 0018:ffff8800af26f9e8 EFLAGS: 00010a07 [ 27.443241] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb1fb [ 27.450744] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 27.457990] RBP: ffff8800af26f9f8 R08: 0000000048000000 R09: 0000000000001e30 [ 27.465231] R10: 0000000000002100 R11: 1ffff10015e4df1a R12: 0000000000000004 [ 27.472477] R13: 0000000000000020 R14: ffff8801ca874200 R15: dffffc0000000000 [ 27.479722] FS: 00007f89442fc700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.487921] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.493777] CR2: 00007f89442fbe78 CR3: 00000001cd9b2000 CR4: 0000000000160670 [ 27.501020] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.508263] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.515507] Stack: [ 27.517646] 0000000000000246 ffff8801ca874358 ffff8800af26fa58 ffffffff825bb221 [ 27.525640] ffff8801ca874370 ffffed003950e86b ffffed003950e86e ffff8801ca874368 [ 27.533630] dead4ead00000000 ffff8801ca874340 0000000000000000 0000000000000000 [ 27.541617] Call Trace: [ 27.544185] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.550655] [] sg_finish_rem_req+0x2a6/0x320 [ 27.556688] [] sg_new_read+0x18b/0x420 [ 27.562205] [] sg_read+0x8cf/0x14d0 [ 27.567457] [] ? __check_object_size+0x154/0x35b [ 27.573834] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.580475] [] ? fsnotify+0xee0/0xee0 [ 27.585898] [] ? avc_policy_seqno+0x9/0x20 [ 27.591755] [] do_loop_readv_writev+0x141/0x1e0 [ 27.598135] [] ? security_file_permission+0x89/0x1e0 [ 27.604864] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.611500] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.618136] [] do_readv_writev+0x5dd/0x6e0 [ 27.623993] [] ? vfs_write+0x530/0x530 [ 27.629504] [] ? sg_ioctl+0x2a00/0x2a00 [ 27.635098] [] ? __vfs_write+0x10b/0x450 [ 27.640780] [] ? __fget+0x47/0x3b0 [ 27.645942] [] ? avc_policy_seqno+0x9/0x20 [ 27.651799] [] ? __fget+0x213/0x3b0 [ 27.657046] [] ? __fget+0x23a/0x3b0 [ 27.662310] [] ? __fget+0x47/0x3b0 [ 27.667472] [] vfs_readv+0x78/0xb0 [ 27.672639] [] SyS_readv+0xd9/0x240 [ 27.677888] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 27.684440] [] ? finish_task_switch+0x1e7/0x660 [ 27.690816] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.697281] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 27.703827] Code: c6 a0 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 [ 27.730680] RIP [] __free_pages+0x21/0x90 [ 27.736570] RSP [ 27.740630] Dumping ftrace buffer: [ 27.744159] (ftrace buffer empty) [ 27.747847] Kernel Offset: disabled [ 27.751448] Rebooting in 86400 seconds..