[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.002208] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.466967] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.735832] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.724077] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 21.900097] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 24.194876] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. executing program [ 27.417699] IPVS: Creating netns size=2552 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.442231] IPVS: Creating netns size=2552 id=2 [ 27.444095] sg_write: data in/out 134348763/216 bytes for SCSI command 0x9f-- guessing data in; [ 27.444095] program syzkaller258683 not setting count and/or reply_len properly executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.511343] kasan: CONFIG_KASAN_INLINE enabled [ 27.521240] IPVS: Creating netns size=2552 id=3 [ 27.526235] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.536930] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.543955] Dumping ftrace buffer: [ 27.547475] (ftrace buffer empty) [ 27.551173] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.554994] CPU: 0 PID: 3738 Comm: syzkaller258683 Not tainted 4.4.120-gd63fdf6 #28 [ 27.562767] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.572105] task: ffff8800adff4800 task.stack: ffff8801d9228000 [ 27.573788] kasan: CONFIG_KASAN_INLINE enabled [ 27.582683] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.590014] RIP: 0010:[] [] sg_read+0xd17/0x1490 [ 27.597948] RSP: 0018:ffff8801d922fbc0 EFLAGS: 00010246 [ 27.603370] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bab1e [ 27.610611] RDX: 0000000000000000 RSI: 0000000020000024 RDI: ffff8800ad5ba270 [ 27.617849] RBP: ffff8801d922fcd0 R08: 0000000000000000 R09: 0000000000000001 [ 27.625086] R10: 0000000000000000 R11: 1ffff1003b245f3e R12: 0000000000000076 [ 27.632324] R13: 0000000000000000 R14: ffff8801d0164060 R15: ffff8800ad5ba240 [ 27.639565] FS: 00007f82ddc77700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.647760] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.653608] CR2: 00000000025525c0 CR3: 00000000b1f8a000 CR4: 0000000000160670 [ 27.660848] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.668089] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.675327] Stack: [ 27.677445] 0000000000000000 0000000000000000 0000000000000000 ffff8800ad5ba258 [ 27.685417] 0000000000000000 ffff8800ad5ba268 000000000000009a 0000000000000000 [ 27.693386] ffff8801d4b12500 0000000000001000 1ffff1003b245f84 0000000020000024 [ 27.701356] Call Trace: [ 27.703913] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.710551] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.717532] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.724168] [] __vfs_read+0x103/0x440 [ 27.729589] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.735529] [] ? fsnotify+0x5ad/0xee0 [ 27.740944] [] ? fsnotify+0xee0/0xee0 [ 27.746373] [] ? avc_policy_seqno+0x9/0x20 [ 27.752227] [] ? selinux_file_permission+0x348/0x460 [ 27.758949] [] ? security_file_permission+0x89/0x1e0 [ 27.765668] [] ? rw_verify_area+0x100/0x2f0 [ 27.771607] [] vfs_read+0x123/0x3a0 [ 27.776851] [] SyS_read+0xd9/0x1b0 [ 27.782007] [] ? do_sendfile+0xd30/0xd30 [ 27.787687] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.794148] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.800690] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 97 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 6b 06 00 00 48 8b 1b 48 85 db 0f 84 3b 03 00 [ 27.827223] RIP [] sg_read+0xd17/0x1490 [ 27.832934] RSP [ 27.836533] general protection fault: 0000 [#2] [ 27.836986] ---[ end trace 1695d5206311e472 ]--- [ 27.836990] Kernel panic - not syncing: Fatal exception [ 27.851142] PREEMPT SMP KASAN [ 27.854870] Dumping ftrace buffer: [ 27.858377] (ftrace buffer empty) [ 27.862062] Modules linked in: [ 27.865344] CPU: 1 PID: 3740 Comm: syzkaller258683 Tainted: G D 4.4.120-gd63fdf6 #28 [ 27.874321] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.883646] task: ffff8801d925b000 task.stack: ffff8801d97e0000 [ 27.889675] RIP: 0010:[] [] sg_read+0xd17/0x1490 [ 27.897734] RSP: 0018:ffff8801d97e7bc0 EFLAGS: 00010246 [ 27.903151] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bab1e [ 27.910393] RDX: 0000000000000000 RSI: 0000000020000024 RDI: ffff8801d9754370 [ 27.917633] RBP: ffff8801d97e7cd0 R08: 0000000000000000 R09: 0000000000000000 [ 27.924875] R10: 0000000000000000 R11: 1ffff1003b2fcf3e R12: 0000000000000076 [ 27.932119] R13: 0000000000000000 R14: ffff8801d0ce2a80 R15: ffff8801d9754340 [ 27.939360] FS: 00007f82ddc56700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.947555] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.953409] CR2: 00007f82ddc55e78 CR3: 00000000b1f8a000 CR4: 0000000000160670 [ 27.960652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.967893] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.975135] Stack: [ 27.977256] 0000000000000000 0000000000000000 0000000000000000 ffff8801d9754358 [ 27.985235] 0000000000000000 ffff8801d9754368 000000000000009a 0000000000000000 [ 27.993216] ffff8801d4b12500 0000000000001000 1ffff1003b2fcf84 0000000020000024 [ 28.001190] Call Trace: [ 28.003748] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.010387] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.017373] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.024013] [] __vfs_read+0x103/0x440 [ 28.029435] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.035378] [] ? fsnotify+0x5ad/0xee0 [ 28.040797] [] ? fsnotify+0xee0/0xee0 [ 28.046218] [] ? avc_policy_seqno+0x9/0x20 [ 28.052074] [] ? selinux_file_permission+0x348/0x460 [ 28.058797] [] ? security_file_permission+0x89/0x1e0 [ 28.065522] [] ? rw_verify_area+0x100/0x2f0 [ 28.071464] [] vfs_read+0x123/0x3a0 [ 28.076713] [] SyS_read+0xd9/0x1b0 [ 28.081874] [] ? do_sendfile+0xd30/0xd30 [ 28.087556] [] ? finish_task_switch+0x1e7/0x4e0 [ 28.093846] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.100312] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.106866] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 97 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 6b 06 00 00 48 8b 1b 48 85 db 0f 84 3b 03 00 [ 28.133694] RIP [] sg_read+0xd17/0x1490 [ 28.139413] RSP [ 28.143469] Dumping ftrace buffer: [ 28.146989] (ftrace buffer empty) [ 28.150669] Kernel Offset: disabled [ 28.154260] Rebooting in 86400 seconds..