[ 15.961833] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 20.176940] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.523950] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.372312] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 21.540843] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 26.920818] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program executing program executing program executing program executing program [ 27.028953] sg_write: data in/out 36090/48 bytes for SCSI command 0xe2-- guessing data in; [ 27.028953] program syzkaller780492 not setting count and/or reply_len properly [ 27.035412] sg_write: data in/out 36090/48 bytes for SCSI command 0xe2-- guessing data in; [ 27.035412] program syzkaller780492 not setting count and/or reply_len properly [ 27.036580] sg_write: data in/out 36090/48 bytes for SCSI command 0xe2-- guessing data in; [ 27.036580] program syzkaller780492 not setting count and/or reply_len properly [ 27.040629] kasan: CONFIG_KASAN_INLINE enabled [ 27.040637] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.040642] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.040646] Dumping ftrace buffer: [ 27.040649] (ftrace buffer empty) [ 27.040653] Modules linked in: [ 27.040660] CPU: 0 PID: 3328 Comm: syzkaller780492 Not tainted 4.4.110-gdac1439 #13 [ 27.040663] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.040667] task: ffff8801d1430000 task.stack: ffff8800b4760000 [ 27.040682] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.040685] RSP: 0018:ffff8800b4767970 EFLAGS: 00010a07 [ 27.040689] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 27.040692] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 27.040696] RBP: ffff8800b4767980 R08: 0000000048000000 R09: 0000000000001e30 [ 27.040699] R10: 0000000000002100 R11: 1ffff100168ecf0c R12: 0000000000000004 [ 27.040703] R13: 0000000000000020 R14: ffff8801ccc2c200 R15: dffffc0000000000 [ 27.040708] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7794b40 [ 27.040712] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.040715] CR2: 00000000204d7fa0 CR3: 00000000b57a8000 CR4: 0000000000160670 [ 27.040721] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.040724] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.040726] Stack: [ 27.040733] 0000000000000246 ffff8801ccc2c358 ffff8800b47679e0 ffffffff825b9c81 [ 27.040740] ffff8801ccc2c370 ffffed003998586b ffffed003998586e ffff8801ccc2c368 [ 27.040747] dead4ead00000000 ffff8801ccc2c340 0000000000000000 0000000000000000 [ 27.040748] Call Trace: [ 27.040759] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.040765] [] sg_finish_rem_req+0x2b5/0x340 [ 27.040772] [] sg_new_read.isra.18+0x17d/0x3c0 [ 27.040778] [] sg_read+0x8c2/0x1490 [ 27.040785] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.040792] [] ? fsnotify+0xee0/0xee0 [ 27.040801] [] ? avc_policy_seqno+0x9/0x20 [ 27.040810] [] do_loop_readv_writev+0x141/0x1e0 [ 27.040816] [] ? security_file_permission+0x89/0x1e0 [ 27.040823] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.040830] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.040836] [] compat_do_readv_writev+0x5df/0x6e0 [ 27.040843] [] ? vfs_writev+0xb0/0xb0 [ 27.040850] [] ? __fget+0x20b/0x3b0 [ 27.040855] [] ? __fget+0x232/0x3b0 [ 27.040860] [] ? __fget+0x47/0x3b0 [ 27.040867] [] compat_readv+0xd9/0x140 [ 27.040872] [] compat_SyS_readv+0xd8/0x1b0 [ 27.040878] [] ? SyS_pwritev+0x230/0x230 [ 27.040884] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.040889] [] ? SyS_pwritev+0x230/0x230 [ 27.040895] [] do_fast_syscall_32+0x314/0x890 [ 27.040903] [] sysenter_flags_fixed+0xd/0x17 [ 27.040987] Code: 96 a4 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 [ 27.040993] RIP [] __free_pages+0x21/0x90 [ 27.040995] RSP [ 27.041001] ---[ end trace 81468e4d2605b531 ]--- [ 27.041005] Kernel panic - not syncing: Fatal exception [ 27.045338] Dumping ftrace buffer: [ 27.045340] (ftrace buffer empty) [ 27.045343] Kernel Offset: disabled [ 27.426820] Rebooting in 86400 seconds..