[ 15.846406] 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: [ 21.021956] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.388581] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.242111] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 22.400054] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 27.773473] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) executing program [ 27.866559] kasan: CONFIG_KASAN_INLINE enabled [ 27.871391] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.884262] Dumping ftrace buffer: [ 27.887769] (ftrace buffer empty) [ 27.891446] Modules linked in: [ 27.894721] CPU: 1 PID: 3312 Comm: syzkaller078413 Not tainted 4.4.111-g3301b55 #17 [ 27.902478] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.911800] task: ffff8800b63c8000 task.stack: ffff8800b13d8000 [ 27.917822] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.926054] RSP: 0018:ffff8800b13df970 EFLAGS: 00010a07 [ 27.931467] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 27.938711] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.945947] RBP: ffff8800b13df980 R08: 0000000000000001 R09: 0000000000000000 [ 27.953182] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.960421] R13: 0000000000000020 R14: ffff8800b537a100 R15: dffffc0000000000 [ 27.967657] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000085d2840 [ 27.975850] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.981698] CR2: 0000000020ef0fe0 CR3: 00000000b524c000 CR4: 0000000000160670 [ 27.988937] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.996181] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.003430] Stack: [ 28.005544] 0000000000000000 ffff8800b537a258 ffff8800b13df9e0 ffffffff825b9ee1 [ 28.013499] ffff8800b537a270 ffffed0016a6f44b ffffed0016a6f44e ffff8800b537a268 [ 28.021444] dead4ead00000000 ffff8800b537a240 0000000000000000 0000000000000000 [ 28.029396] Call Trace: [ 28.031961] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.038419] [] sg_finish_rem_req+0x2b5/0x340 [ 28.044442] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.050552] [] ? sg_get_rq_mark+0x142/0x190 [ 28.056489] [] sg_read+0x8c2/0x1490 [ 28.061742] [] ? do_page_fault+0x27/0x30 [ 28.067421] [] ? page_fault+0x28/0x30 [ 28.072855] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.079487] [] ? fsnotify+0xee0/0xee0 [ 28.084904] [] ? avc_policy_seqno+0x9/0x20 [ 28.090754] [] do_loop_readv_writev+0x141/0x1e0 [ 28.097043] [] ? security_file_permission+0x89/0x1e0 [ 28.103764] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.110403] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.117041] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.123499] [] ? vfs_writev+0xb0/0xb0 [ 28.128917] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.134854] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.140966] [] compat_readv+0xd9/0x140 [ 28.146466] [] compat_SyS_readv+0xd8/0x1b0 [ 28.152329] [] ? SyS_pwritev+0x230/0x230 [ 28.158006] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.164200] [] ? SyS_pwritev+0x230/0x230 [ 28.169877] [] do_fast_syscall_32+0x314/0x890 [ 28.175990] [] sysenter_flags_fixed+0xd/0x17 [ 28.182012] 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 [ 28.208388] RIP [] __free_pages+0x21/0x90 [ 28.214263] RSP [ 28.218840] ---[ end trace 6c4c2120085a87b5 ]--- [ 28.223587] Kernel panic - not syncing: Fatal exception [ 28.229364] Dumping ftrace buffer: [ 28.232884] (ftrace buffer empty) [ 28.236559] Kernel Offset: disabled [ 28.240153] Rebooting in 86400 seconds..