[....] Starting file context mai[ 16.801512] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) ntaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.831476] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 22.300048] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 23.168035] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 23.349837] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 28.750961] random: sshd: uninitialized urandom read (32 bytes read, 116 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 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 [ 29.267972] kasan: CONFIG_KASAN_INLINE enabled [ 29.272404] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.285719] Dumping ftrace buffer: [ 29.289254] (ftrace buffer empty) [ 29.292930] Modules linked in: [ 29.296201] CPU: 1 PID: 3420 Comm: syzkaller982637 Not tainted 4.4.111-gf851888 #16 [ 29.303975] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.313300] task: ffff8800b3e02f80 task.stack: ffff8800b4b30000 [ 29.319326] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.327552] RSP: 0018:ffff8800b4b37970 EFLAGS: 00010a07 [ 29.332964] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 29.340200] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.347436] RBP: ffff8800b4b37980 R08: 0000000000000001 R09: 0000000000000001 [ 29.354677] R10: 0000000000000000 R11: 1ffff10016966f0c R12: 0000000000000004 [ 29.361915] R13: 0000000000000020 R14: ffff8801d064a100 R15: dffffc0000000000 [ 29.369152] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008f9a900 [ 29.377350] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.383202] CR2: 00007f3dd2341000 CR3: 00000000b443c000 CR4: 0000000000160670 [ 29.390439] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.397675] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.404909] Stack: [ 29.407024] ffffffff83776469 ffff8801d064a258 ffff8800b4b379e0 ffffffff825b9ec1 [ 29.414979] ffff8801d064a270 ffffed003a0c944b ffffed003a0c944e ffff8801d064a268 [ 29.422925] dead4ead00000000 ffff8801d064a240 0000000000000000 0000000000000000 [ 29.430886] Call Trace: [ 29.433442] [] ? retint_kernel+0x2d/0x2d [ 29.439121] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.445577] [] sg_finish_rem_req+0x2b5/0x340 [ 29.451608] [] sg_new_read.isra.18+0x336/0x3c0 [ 29.457806] [] sg_read+0x8c2/0x1490 [ 29.463052] [] ? mark_held_locks+0xaf/0x100 [ 29.468992] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.475623] [] ? fsnotify+0xee0/0xee0 [ 29.481041] [] ? avc_policy_seqno+0x9/0x20 [ 29.486892] [] do_loop_readv_writev+0x141/0x1e0 [ 29.493182] [] ? security_file_permission+0x89/0x1e0 [ 29.499900] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.506535] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.513166] [] compat_do_readv_writev+0x5df/0x6e0 [ 29.519623] [] ? vfs_writev+0xb0/0xb0 [ 29.525040] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.530987] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.537103] [] ? rw_verify_area+0x100/0x2f0 [ 29.543056] [] compat_readv+0xd9/0x140 [ 29.548563] [] compat_SyS_readv+0xd8/0x1b0 [ 29.554412] [] ? SyS_pwritev+0x230/0x230 [ 29.560089] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.566284] [] ? SyS_pwritev+0x230/0x230 [ 29.571961] [] do_fast_syscall_32+0x314/0x890 [ 29.578077] [] sysenter_flags_fixed+0xd/0x17 [ 29.584096] 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 [ 29.610384] RIP [] __free_pages+0x21/0x90 [ 29.616262] RSP [ 29.620739] ---[ end trace 8b91d812b59e0582 ]--- [ 29.625485] Kernel panic - not syncing: Fatal exception [ 29.631296] Dumping ftrace buffer: [ 29.634800] (ftrace buffer empty) [ 29.638481] Kernel Offset: disabled [ 29.642071] Rebooting in 86400 seconds..