[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.218817] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.552962] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.974475] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.779089] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 29.058865] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.15.236' (ECDSA) to the list of known hosts. [ 34.450991] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 34.549873] kasan: CONFIG_KASAN_INLINE enabled [ 34.554805] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.567623] Dumping ftrace buffer: [ 34.571139] (ftrace buffer empty) [ 34.574815] Modules linked in: [ 34.578087] CPU: 1 PID: 3330 Comm: syzkaller243232 Not tainted 4.4.107-g610c835 #12 [ 34.585844] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.595167] task: ffff8800b4b297c0 task.stack: ffff8800b4b08000 [ 34.601187] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 34.609417] RSP: 0018:ffff8800b4b0f9f0 EFLAGS: 00010a07 [ 34.614843] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 34.622087] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 34.629328] RBP: ffff8800b4b0fa00 R08: 0000000000000001 R09: 0000000000000000 [ 34.636565] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 34.643813] R13: 0000000000000020 R14: ffff8800b423c200 R15: dffffc0000000000 [ 34.651051] FS: 0000000000fb1880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.659245] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.665105] CR2: 0000000020d84f40 CR3: 00000000b4ba6000 CR4: 00000000001406e0 [ 34.672347] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.679596] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.686834] Stack: [ 34.688948] 0000000000000000 ffff8800b423c358 ffff8800b4b0fa60 ffffffff825b8cf1 [ 34.696912] ffff8800b423c370 ffffed001684786b ffffed001684786e ffff8800b423c368 [ 34.704863] dead4ead00000000 ffff8800b423c340 0000000000000000 0000000000000000 [ 34.712818] Call Trace: [ 34.715380] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 34.721849] [] sg_finish_rem_req+0x2b5/0x340 [ 34.727876] [] sg_new_read.isra.18+0x39/0x3c0 [ 34.733987] [] ? sg_get_rq_mark+0x142/0x190 [ 34.739925] [] sg_read+0x8c2/0x1490 [ 34.745170] [] ? __check_object_size+0x154/0x35b [ 34.751541] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.758175] [] ? fsnotify+0xee0/0xee0 [ 34.763592] [] ? avc_policy_seqno+0x9/0x20 [ 34.769445] [] do_loop_readv_writev+0x141/0x1e0 [ 34.775731] [] ? security_file_permission+0x89/0x1e0 [ 34.782452] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.789084] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.795727] [] do_readv_writev+0x5dd/0x6e0 [ 34.801580] [] ? vfs_write+0x530/0x530 [ 34.807091] [] ? sg_ioctl+0x2c20/0x2c20 [ 34.812690] [] ? __vfs_write+0x10b/0x450 [ 34.818368] [] ? handle_mm_fault+0x3f2/0x3190 [ 34.824481] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.831287] [] ? fsnotify+0xee0/0xee0 [ 34.836705] [] ? rw_verify_area+0x100/0x2f0 [ 34.842644] [] vfs_readv+0x78/0xb0 [ 34.847800] [] SyS_readv+0xd9/0x240 [ 34.853042] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 34.859598] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.866056] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 34.872602] Code: 76 ae 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 [ 34.898992] RIP [] __free_pages+0x21/0x90 [ 34.904873] RSP [ 34.908671] ---[ end trace c82347faf23a5d3c ]--- [ 34.914062] Kernel panic - not syncing: Fatal exception [ 34.919808] Dumping ftrace buffer: [ 34.923326] (ftrace buffer empty) [ 34.927010] Kernel Offset: disabled [ 34.930615] Rebooting in 86400 seconds..