[ 16.254422] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 20.471337] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.004689] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.858449] random: sshd: uninitialized urandom read (32 bytes read, 88 bits of entropy available) [ 22.032119] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 27.430481] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 27.548679] IPVS: Creating netns size=2552 id=1 [ 27.574326] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.598710] 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 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 [ 27.676440] IPVS: Creating netns size=2552 id=4 [ 27.676988] kasan: CONFIG_KASAN_INLINE enabled [ 27.676997] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.677000] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.677003] Dumping ftrace buffer: [ 27.677005] (ftrace buffer empty) [ 27.677008] Modules linked in: [ 27.677013] CPU: 0 PID: 3324 Comm: syzkaller876749 Not tainted 4.4.113-gef588ef #33 [ 27.677015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.677018] task: ffff8801d1965f00 task.stack: ffff8800b6ad0000 [ 27.677028] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.677030] RSP: 0018:ffff8800b6ad79f0 EFLAGS: 00010a07 [ 27.677032] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b6f2b [ 27.677035] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.677037] RBP: ffff8800b6ad7a00 R08: 0000000000000001 R09: 0000000000000001 [ 27.677039] R10: 0000000000000000 R11: 1ffff10016d5af1c R12: 0000000000000004 [ 27.677041] R13: 0000000000000020 R14: ffff8801ccaa8000 R15: dffffc0000000000 [ 27.677044] FS: 0000000001d10880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.677046] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.677048] CR2: 000000002026b000 CR3: 00000000b6ad8000 CR4: 0000000000160670 [ 27.677053] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.677055] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.677056] Stack: [ 27.677061] 0000000000000246 ffff8801ccaa8158 ffff8800b6ad7a60 ffffffff825b6f51 [ 27.677065] ffff8801ccaa8170 ffffed003995502b ffffed003995502e ffff8801ccaa8168 [ 27.677069] dead4ead00000000 ffff8801ccaa8140 0000000000000000 0000000000000000 [ 27.677069] Call Trace: [ 27.677078] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.677082] [] sg_finish_rem_req+0x2b5/0x340 [ 27.677086] [] sg_new_read.isra.18+0x336/0x3c0 [ 27.677090] [] sg_read+0x8bc/0x1490 [ 27.677096] [] ? __check_object_size+0x154/0x35b [ 27.677100] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.677105] [] ? fsnotify+0xee0/0xee0 [ 27.677111] [] ? avc_policy_seqno+0x9/0x20 [ 27.677116] [] do_loop_readv_writev+0x141/0x1e0 [ 27.677120] [] ? security_file_permission+0x89/0x1e0 [ 27.677124] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.677128] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.677131] [] do_readv_writev+0x5dd/0x6e0 [ 27.677135] [] ? vfs_write+0x530/0x530 [ 27.677140] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.677144] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 27.677150] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.677153] [] ? __fsnotify_parent+0xbc/0x340 [ 27.677157] [] ? avc_policy_seqno+0x9/0x20 [ 27.677160] [] ? fsnotify+0x5ad/0xee0 [ 27.677163] [] vfs_readv+0x78/0xb0 [ 27.677166] [] SyS_readv+0xd9/0x240 [ 27.677169] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 27.677175] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.677179] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.677227] Code: b6 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 [ 27.677231] RIP [] __free_pages+0x21/0x90 [ 27.677232] RSP [ 27.677237] ---[ end trace f20465ba017b0d74 ]--- [ 27.677240] Kernel panic - not syncing: Fatal exception [ 27.681536] Dumping ftrace buffer: [ 27.681538] (ftrace buffer empty) [ 27.681539] Kernel Offset: disabled [ 28.046979] Rebooting in 86400 seconds..