[ 17.602549] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.186952] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.470292] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.272189] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 22.418373] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 27.813303] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.914650] 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 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 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 [ 28.280419] random: nonblocking pool is initialized [ 28.282589] kasan: CONFIG_KASAN_INLINE enabled [ 28.282597] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.282601] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.282605] Dumping ftrace buffer: [ 28.282608] (ftrace buffer empty) [ 28.282611] Modules linked in: [ 28.282618] CPU: 0 PID: 3672 Comm: syzkaller369025 Not tainted 4.4.115-g0e9bcc1 #11 [ 28.282621] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.282625] task: ffff8800b08a6000 task.stack: ffff8801ca6c8000 [ 28.282640] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.282644] RSP: 0018:ffff8801ca6cfa40 EFLAGS: 00010a07 [ 28.282647] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 28.282651] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 28.282654] RBP: ffff8801ca6cfa50 R08: 0000000000000000 R09: 0000000000000000 [ 28.282658] R10: 0000000000000000 R11: 1ffff100394d9f26 R12: 0000000000000004 [ 28.282661] R13: 0000000000000020 R14: ffff8800afa14200 R15: dffffc0000000000 [ 28.282666] FS: 00000000017a2880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.282670] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.282673] CR2: 0000000020adff12 CR3: 00000001d4892000 CR4: 0000000000160670 [ 28.282679] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.282682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.282684] Stack: [ 28.282691] ffffffff83775129 ffff8800afa14358 ffff8801ca6cfab0 ffffffff825b8751 [ 28.282698] ffff8800afa14370 ffffed0015f4286b ffffed0015f4286e ffff8800afa14368 [ 28.282705] dead4ead00000000 ffff8800afa14340 0000000000000000 0000000000000000 [ 28.282706] Call Trace: [ 28.282715] [] ? retint_kernel+0x2d/0x2d [ 28.282725] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.282731] [] sg_finish_rem_req+0x2b5/0x340 [ 28.282738] [] sg_read+0xa1b/0x1490 [ 28.282747] [] ? __check_object_size+0x154/0x35b [ 28.282753] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.282760] [] ? fsnotify+0xee0/0xee0 [ 28.282770] [] ? avc_policy_seqno+0x9/0x20 [ 28.282777] [] do_loop_readv_writev+0x141/0x1e0 [ 28.282784] [] ? security_file_permission+0x89/0x1e0 [ 28.282790] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.282797] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 28.282802] [] do_readv_writev+0x5dd/0x6e0 [ 28.282807] [] ? vfs_write+0x530/0x530 [ 28.282812] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.282819] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.282826] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.282832] [] ? __fsnotify_parent+0xbc/0x340 [ 28.282838] [] ? avc_policy_seqno+0x9/0x20 [ 28.282843] [] ? fsnotify+0x5ad/0xee0 [ 28.282851] [] ? __do_page_fault+0x290/0xa00 [ 28.282856] [] vfs_readv+0x78/0xb0 [ 28.282861] [] SyS_readv+0xd9/0x240 [ 28.282866] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 28.282873] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.282879] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.282970] Code: c6 9f 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 [ 28.282976] RIP [] __free_pages+0x21/0x90 [ 28.282978] RSP [ 28.282984] ---[ end trace 4650785bbb312979 ]--- [ 28.282988] Kernel panic - not syncing: Fatal exception [ 28.646667] Dumping ftrace buffer: [ 28.650186] (ftrace buffer empty) [ 28.653865] Kernel Offset: disabled [ 28.657461] Rebooting in 86400 seconds..