[ 15.505365] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.016213] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.208736] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.045024] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 32.818095] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.15.209' (ECDSA) to the list of known hosts. [ 38.205547] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program [ 38.299958] kasan: CONFIG_KASAN_INLINE enabled [ 38.304935] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.317774] Dumping ftrace buffer: [ 38.321282] (ftrace buffer empty) [ 38.324959] Modules linked in: [ 38.328230] CPU: 1 PID: 3322 Comm: syzkaller188691 Not tainted 4.4.110-gdac1439 #13 [ 38.335990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.345321] task: ffff8801d11c0000 task.stack: ffff8801d0060000 [ 38.351343] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 38.359573] RSP: 0018:ffff8801d0067970 EFLAGS: 00010a07 [ 38.364988] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 38.372227] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 38.379465] RBP: ffff8801d0067980 R08: 0000000000000001 R09: 0000000000000001 [ 38.386702] R10: 0000000000000000 R11: 1ffff1003a00cf0c R12: 0000000000000004 [ 38.393950] R13: 0000000000000020 R14: ffff8801d0f82100 R15: dffffc0000000000 [ 38.401189] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008285840 [ 38.409390] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 38.415245] CR2: 000000002000f000 CR3: 00000001d4346000 CR4: 0000000000160670 [ 38.422485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.429724] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.436962] Stack: [ 38.439080] 0000000000000246 ffff8801d0f82258 ffff8801d00679e0 ffffffff825b9c81 [ 38.447036] ffff8801d0f82270 ffffed003a1f044b ffffed003a1f044e ffff8801d0f82268 [ 38.454996] dead4ead00000000 ffff8801d0f82240 0000000000000000 0000000000000000 [ 38.462946] Call Trace: [ 38.465505] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 38.471965] [] sg_finish_rem_req+0x2b5/0x340 [ 38.477990] [] sg_new_read.isra.18+0x336/0x3c0 [ 38.484189] [] sg_read+0x8c2/0x1490 [ 38.489432] [] ? sg_ioctl+0x2c20/0x2c20 [ 38.495031] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.501663] [] ? fsnotify+0xee0/0xee0 [ 38.507083] [] ? avc_policy_seqno+0x9/0x20 [ 38.512937] [] do_loop_readv_writev+0x141/0x1e0 [ 38.519225] [] ? security_file_permission+0x89/0x1e0 [ 38.525955] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.532587] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 38.539218] [] compat_do_readv_writev+0x5df/0x6e0 [ 38.545679] [] ? vfs_writev+0xb0/0xb0 [ 38.551102] [] ? __vfs_write+0x10b/0x450 [ 38.556787] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 38.563681] [] ? quarantine_put+0xab/0x180 [ 38.569535] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 38.576339] [] ? __fsnotify_parent+0xbc/0x340 [ 38.582451] [] ? avc_policy_seqno+0x9/0x20 [ 38.588299] [] ? fsnotify+0x5ad/0xee0 [ 38.593716] [] ? fsnotify+0xee0/0xee0 [ 38.599142] [] ? rw_verify_area+0x100/0x2f0 [ 38.605080] [] compat_readv+0xd9/0x140 [ 38.610592] [] compat_SyS_readv+0xd8/0x1b0 [ 38.616443] [] ? SyS_pwritev+0x230/0x230 [ 38.622119] [] ? vmacache_update+0xfe/0x130 [ 38.628065] [] ? do_fast_syscall_32+0xd7/0x890 [ 38.634263] [] ? SyS_pwritev+0x230/0x230 [ 38.639938] [] do_fast_syscall_32+0x314/0x890 [ 38.646057] [] sysenter_flags_fixed+0xd/0x17 [ 38.652082] 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 [ 38.678384] RIP [] __free_pages+0x21/0x90 [ 38.684264] RSP [ 38.688185] ---[ end trace aabc4c97af5b5221 ]--- [ 38.693636] Kernel panic - not syncing: Fatal exception [ 38.699016] Dumping ftrace buffer: [ 38.702525] (ftrace buffer empty) [ 38.706201] Kernel Offset: disabled [ 38.709791] Rebooting in 86400 seconds..