[....] Starting OpenBSD Secure Shell server: sshd[ 22.180689] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.622610] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.173929] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.207826] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) [ 27.386778] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 27.492658] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. executing program executing program [ 32.934334] IPVS: Creating netns size=2552 id=1 [ 32.955938] kasan: CONFIG_KASAN_INLINE enabled [ 32.960362] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.973244] Dumping ftrace buffer: [ 32.976753] (ftrace buffer empty) [ 32.980447] Modules linked in:[ 32.981288] IPVS: Creating netns size=2552 id=2 [ 32.988095] [ 32.990006] CPU: 0 PID: 3805 Comm: syzkaller798141 Not tainted 4.4.120-gd63fdf6 #28 [ 32.997779] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.004512] kasan: CONFIG_KASAN_INLINE enabled [ 33.011660] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.011660] task: ffff8801c58ab000 task.stack: ffff8801d9188000 [ 33.025006] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 33.033238] RSP: 0018:ffff8801d918f9f0 EFLAGS: 00010a07 [ 33.038657] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 33.045898] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 33.053138] RBP: ffff8801d918fa00 R08: 0000000000000001 R09: 0000000000000000 [ 33.060380] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 33.067619] R13: 0000000000000020 R14: ffff8801d9928000 R15: dffffc0000000000 [ 33.074860] FS: 00007f1bb2c29700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.083058] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.088910] CR2: 000000002085dff0 CR3: 00000001d96cc000 CR4: 0000000000160670 [ 33.096238] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.103482] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.110720] Stack: [ 33.112839] 0000000000000000 ffff8801d9928158 ffff8801d918fa60 ffffffff825b8611 [ 33.120811] ffff8801d9928170 ffffed003b32502b ffffed003b32502e ffff8801d9928168 [ 33.128778] dead4ead00000000 ffff8801d9928140 0000000000000000 0000000000000000 [ 33.136754] Call Trace: [ 33.139315] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 33.145779] [] sg_finish_rem_req+0x2b5/0x340 [ 33.151808] [] sg_new_read.isra.18+0x39/0x3c0 [ 33.157922] [] ? sg_get_rq_mark+0x142/0x190 [ 33.163863] [] sg_read+0x8bc/0x1490 [ 33.169122] [] ? __check_object_size+0x154/0x35b [ 33.175497] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.182134] [] ? fsnotify+0xee0/0xee0 [ 33.187558] [] ? avc_policy_seqno+0x9/0x20 [ 33.193416] [] do_loop_readv_writev+0x141/0x1e0 [ 33.199705] [] ? security_file_permission+0x89/0x1e0 [ 33.206432] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.213074] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.219709] [] do_readv_writev+0x5dd/0x6e0 [ 33.225561] [] ? vfs_write+0x530/0x530 [ 33.231069] [] ? sg_ioctl+0x29f0/0x29f0 [ 33.236673] [] ? __vfs_write+0x10b/0x450 [ 33.242874] [] ? quarantine_put+0xab/0x180 [ 33.248730] [] ? __fget+0x213/0x3b0 [ 33.253975] [] ? __fget+0x23a/0x3b0 [ 33.259220] [] ? __fget+0x47/0x3b0 [ 33.264384] [] vfs_readv+0x78/0xb0 [ 33.269549] [] SyS_readv+0xd9/0x240 [ 33.274797] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 33.281343] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.287804] [] entry_SYSCALL_64_fastpath+0x1c/0x98 executing program [ 33.294347] 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 [ 33.321011] RIP [] __free_pages+0x21/0x90 [ 33.326900] RSP [ 33.330504] general protection fault: 0000 [#2] [ 33.331425] ---[ end trace 64f7af10e6e4c25f ]--- [ 33.331429] Kernel panic - not syncing: Fatal exception [ 33.345127] PREEMPT SMP KASAN [ 33.348864] Dumping ftrace buffer: [ 33.352375] (ftrace buffer empty) [ 33.356151] Modules linked in: [ 33.359449] CPU: 1 PID: 3809 Comm: syzkaller798141 Tainted: G D 4.4.120-gd63fdf6 #28 [ 33.368517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.377844] task: ffff8800bb921800 task.stack: ffff8800bad00000 [ 33.383871] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 33.392113] RSP: 0018:ffff8800bad079f0 EFLAGS: 00010a07 [ 33.397535] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 33.404778] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 33.412023] RBP: ffff8800bad07a00 R08: 0000000000000000 R09: 0000000000000000 [ 33.419266] R10: 0000000000000000 R11: 1ffff100175a0f1e R12: 0000000000000004 [ 33.426513] R13: 0000000000000020 R14: ffff8800ab7c8000 R15: dffffc0000000000 [ 33.433762] FS: 00007f1bb2c29700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.441959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.447817] CR2: 000000002085dff0 CR3: 00000001c798c000 CR4: 0000000000160670 [ 33.455063] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.462307] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.469551] Stack: [ 33.471673] 0000000000000000 ffff8800ab7c8158 ffff8800bad07a60 ffffffff825b8611 [ 33.479700] ffff8800ab7c8170 ffffed00156f902b ffffed00156f902e ffff8800ab7c8168 [ 33.487721] dead4ead00000000 ffff8800ab7c8140 0000000000000000 0000000000000000 [ 33.495707] Call Trace: [ 33.498316] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 33.504780] [] sg_finish_rem_req+0x2b5/0x340 [ 33.510812] [] sg_new_read.isra.18+0x39/0x3c0 [ 33.516931] [] ? sg_get_rq_mark+0x142/0x190 [ 33.522873] [] sg_read+0x8bc/0x1490 [ 33.528138] [] ? __check_object_size+0x154/0x35b [ 33.534516] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.541156] [] ? fsnotify+0xee0/0xee0 [ 33.546582] [] ? avc_policy_seqno+0x9/0x20 [ 33.552447] [] do_loop_readv_writev+0x141/0x1e0 [ 33.558738] [] ? security_file_permission+0x89/0x1e0 [ 33.565474] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.572114] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.578758] [] do_readv_writev+0x5dd/0x6e0 [ 33.584625] [] ? vfs_write+0x530/0x530 [ 33.590137] [] ? _raw_spin_unlock+0x2c/0x50 [ 33.596082] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 33.603072] [] ? __fget+0x47/0x3b0 [ 33.608241] [] ? avc_policy_seqno+0x9/0x20 [ 33.615050] [] ? __fget+0x213/0x3b0 [ 33.620299] [] ? __fget+0x23a/0x3b0 [ 33.625635] [] ? __fget+0x47/0x3b0 [ 33.630798] [] vfs_readv+0x78/0xb0 [ 33.635962] [] SyS_readv+0xd9/0x240 [ 33.641217] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 33.647768] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 33.654323] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.660871] 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 [ 33.687814] RIP [] __free_pages+0x21/0x90 [ 33.693705] RSP [ 33.697848] Dumping ftrace buffer: [ 33.701380] (ftrace buffer empty) [ 33.705059] Kernel Offset: disabled [ 33.708653] Rebooting in 86400 seconds..