[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.178163] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.062538] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.434507] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.122596] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 22.299529] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.15.216' (ECDSA) to the list of known hosts. [ 27.670117] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) [ 27.792676] IPVS: Creating netns size=2552 id=1 executing program executing program executing program executing program executing program executing program executing program executing program [ 27.829862] IPVS: Creating netns size=2552 id=2 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.877572] IPVS: Creating netns size=2552 id=3 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.946129] IPVS: Creating netns size=2552 id=4 [ 27.949094] kasan: CONFIG_KASAN_INLINE enabled [ 27.949103] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.949107] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.949113] Dumping ftrace buffer: [ 27.949116] (ftrace buffer empty) [ 27.949119] Modules linked in: [ 27.949127] CPU: 0 PID: 3321 Comm: syzkaller881919 Not tainted 4.4.112-g3fc4284 #32 [ 27.949130] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.949134] task: ffff8801d1965f00 task.stack: ffff8800b4648000 [ 27.949151] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.949155] RSP: 0018:ffff8800b464f9f0 EFLAGS: 00010a07 [ 27.949159] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba47b [ 27.949162] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 27.949166] RBP: ffff8800b464fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 27.949169] R10: 0000000000002100 R11: 1ffff100168c9f1c R12: 0000000000000004 [ 27.949172] R13: 0000000000000020 R14: ffff8800b40d8000 R15: dffffc0000000000 [ 27.949178] FS: 0000000002229880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.949181] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.949185] CR2: 0000000020a13000 CR3: 00000000b5e3c000 CR4: 0000000000160670 [ 27.949191] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.949194] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.949195] Stack: [ 27.949203] 0000000000000246 ffff8800b40d8158 ffff8800b464fa60 ffffffff825ba4a1 [ 27.949210] ffff8800b40d8170 ffffed001681b02b ffffed001681b02e ffff8800b40d8168 [ 27.949217] dead4ead00000000 ffff8800b40d8140 0000000000000000 0000000000000000 [ 27.949219] Call Trace: [ 27.949232] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.949239] [] sg_finish_rem_req+0x2b5/0x340 [ 27.949245] [] sg_new_read.isra.18+0x17d/0x3c0 [ 27.949251] [] sg_read+0x8c2/0x1490 [ 27.949261] [] ? __check_object_size+0x154/0x35b [ 27.949265] [] ? 0xffffffff810002b8 [ 27.949272] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.949279] [] ? fsnotify+0xee0/0xee0 [ 27.949289] [] ? avc_policy_seqno+0x9/0x20 [ 27.949297] [] do_loop_readv_writev+0x141/0x1e0 [ 27.949304] [] ? security_file_permission+0x89/0x1e0 [ 27.949310] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.949316] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.949323] [] do_readv_writev+0x5dd/0x6e0 [ 27.949329] [] ? vfs_write+0x530/0x530 [ 27.949336] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.949342] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.949350] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.949358] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.949363] [] ? __fsnotify_parent+0xbc/0x340 [ 27.949369] [] ? avc_policy_seqno+0x9/0x20 [ 27.949374] [] ? fsnotify+0x5ad/0xee0 [ 27.949381] [] vfs_readv+0x78/0xb0 [ 27.949386] [] SyS_readv+0xd9/0x240 [ 27.949392] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.949399] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.949406] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.949491] Code: 26 a6 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 [ 27.949497] RIP [] __free_pages+0x21/0x90 [ 27.949499] RSP [ 27.949505] ---[ end trace b35e7e86730f008c ]--- [ 27.949509] Kernel panic - not syncing: Fatal exception [ 27.951261] Dumping ftrace buffer: [ 27.951263] (ftrace buffer empty) [ 27.951266] Kernel Offset: disabled [ 28.328774] Rebooting in 86400 seconds..