[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.233152] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.103330] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.436588] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.147849] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) [ 22.321531] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) Warning: Permanently added '10.128.15.235' (ECDSA) to the list of known hosts. [ 27.729047] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) executing program executing program [ 27.829586] sg_write: data in/out 36090/8 bytes for SCSI command 0x67-- guessing data in; [ 27.829586] program syzkaller136940 not setting count and/or reply_len properly [ 27.832021] sg_write: data in/out 36090/8 bytes for SCSI command 0x67-- guessing data in; [ 27.832021] program syzkaller136940 not setting count and/or reply_len properly [ 27.833308] kasan: CONFIG_KASAN_INLINE enabled [ 27.833315] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.833320] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.833324] Dumping ftrace buffer: [ 27.833327] (ftrace buffer empty) [ 27.833330] Modules linked in: [ 27.833337] CPU: 1 PID: 3314 Comm: syzkaller136940 Not tainted 4.4.110-gdac1439 #20 [ 27.833340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.833344] task: ffff8800b51b5f00 task.stack: ffff8800b47e8000 [ 27.833358] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.833362] RSP: 0018:ffff8800b47ef9f0 EFLAGS: 00010a07 [ 27.833366] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 27.833369] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 27.833372] RBP: ffff8800b47efa00 R08: 0000000000000001 R09: 0000000000000000 [ 27.833375] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.833379] R13: 0000000000000020 R14: ffff8800b4750000 R15: dffffc0000000000 [ 27.833384] FS: 0000000001ce1880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.833387] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.833391] CR2: 0000000020bb7000 CR3: 00000000b5096000 CR4: 0000000000160670 [ 27.833397] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.833400] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.833401] Stack: [ 27.833409] 0000000000000000 ffff8800b4750158 ffff8800b47efa60 ffffffff825b9c81 [ 27.833416] ffff8800b4750170 ffffed00168ea02b ffffed00168ea02e ffff8800b4750168 [ 27.833423] dead4ead00000000 ffff8800b4750140 0000000000000000 0000000000000000 [ 27.833424] Call Trace: [ 27.833434] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.833441] [] sg_finish_rem_req+0x2b5/0x340 [ 27.833448] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.833454] [] ? sg_get_rq_mark+0x142/0x190 [ 27.833460] [] sg_read+0x8c2/0x1490 [ 27.833469] [] ? __check_object_size+0x154/0x35b [ 27.833475] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.833481] [] ? fsnotify+0xee0/0xee0 [ 27.833490] [] ? avc_policy_seqno+0x9/0x20 [ 27.833497] [] do_loop_readv_writev+0x141/0x1e0 [ 27.833503] [] ? security_file_permission+0x89/0x1e0 [ 27.833509] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.833516] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.833522] [] do_readv_writev+0x5dd/0x6e0 [ 27.833528] [] ? vfs_write+0x530/0x530 [ 27.833534] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.833540] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.833548] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.833555] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.833560] [] ? __fsnotify_parent+0xbc/0x340 [ 27.833567] [] ? avc_policy_seqno+0x9/0x20 [ 27.833572] [] ? fsnotify+0x5ad/0xee0 [ 27.833578] [] vfs_readv+0x78/0xb0 [ 27.833584] [] SyS_readv+0xd9/0x240 [ 27.833589] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.833596] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.833602] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.833686] 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 [ 27.833692] RIP [] __free_pages+0x21/0x90 [ 27.833694] RSP [ 27.833700] ---[ end trace 6b2e99bbe8aad08d ]--- [ 27.833704] Kernel panic - not syncing: Fatal exception [ 27.845952] Dumping ftrace buffer: [ 27.845954] (ftrace buffer empty) [ 27.845956] Kernel Offset: disabled [ 28.248399] Rebooting in 86400 seconds..