[....] Starting [ 16.203806] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) file context maintaining 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: [ 21.672856] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.906717] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.688725] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) [ 44.001585] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 49.603935] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) [ 49.711198] IPVS: Creating netns size=2552 id=1 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 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 [ 50.493304] kasan: CONFIG_KASAN_INLINE enabled [ 50.497755] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.511511] Dumping ftrace buffer: [ 50.515019] (ftrace buffer empty) [ 50.518696] Modules linked in: [ 50.521974] CPU: 0 PID: 3486 Comm: syzkaller107313 Not tainted 4.4.110-g618a510 #15 [ 50.529738] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.539069] task: ffff8800b4382f80 task.stack: ffff8801cf440000 [ 50.545092] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 50.553329] RSP: 0018:ffff8801cf447970 EFLAGS: 00010a07 [ 50.558757] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 50.565996] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 50.573233] RBP: ffff8801cf447980 R08: 0000000000000001 R09: 0000000000000001 [ 50.580474] R10: 0000000000000000 R11: 1ffff10039e88f0c R12: 0000000000000004 [ 50.587712] R13: 0000000000000020 R14: ffff8800b434c200 R15: dffffc0000000000 [ 50.594951] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008309840 [ 50.603152] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 50.609013] CR2: 0000000020dc8000 CR3: 00000001cff16000 CR4: 0000000000160670 [ 50.616251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.623492] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.630745] Stack: [ 50.632863] ffffffff83776229 ffff8800b434c358 ffff8801cf4479e0 ffffffff825b9c81 [ 50.640820] ffff8800b434c370 ffffed001686986b ffffed001686986e ffff8800b434c368 [ 50.648802] dead4ead00000000 ffff8800b434c340 0000000000000000 0000000000000000 [ 50.656772] Call Trace: [ 50.659333] [] ? retint_kernel+0x2d/0x2d [ 50.665015] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 50.671472] [] sg_finish_rem_req+0x2b5/0x340 [ 50.677505] [] sg_new_read.isra.18+0x336/0x3c0 [ 50.683701] [] sg_read+0x8c2/0x1490 [ 50.688944] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 50.695586] [] ? fsnotify+0xee0/0xee0 [ 50.701015] [] ? avc_policy_seqno+0x9/0x20 [ 50.706871] [] do_loop_readv_writev+0x141/0x1e0 [ 50.713154] [] ? security_file_permission+0x89/0x1e0 [ 50.719872] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 50.726518] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 50.733151] [] compat_do_readv_writev+0x5df/0x6e0 [ 50.739626] [] ? vfs_writev+0xb0/0xb0 [ 50.745043] [] ? _raw_spin_unlock+0x2c/0x50 [ 50.750988] [] ? handle_mm_fault+0x3f2/0x3190 [ 50.757109] [] ? rw_verify_area+0x100/0x2f0 [ 50.763042] [] compat_readv+0xd9/0x140 [ 50.768543] [] compat_SyS_readv+0xd8/0x1b0 [ 50.774398] [] ? SyS_pwritev+0x230/0x230 [ 50.780076] [] ? do_fast_syscall_32+0xd7/0x890 [ 50.786287] [] ? SyS_pwritev+0x230/0x230 [ 50.791976] [] do_fast_syscall_32+0x314/0x890 [ 50.798090] [] sysenter_flags_fixed+0xd/0x17 [ 50.804121] 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 [ 50.830515] RIP [] __free_pages+0x21/0x90 [ 50.836393] RSP [ 50.840713] ---[ end trace 9ef48a0fb3df1fd4 ]--- [ 50.845470] Kernel panic - not syncing: Fatal exception [ 50.851136] Dumping ftrace buffer: [ 50.854644] (ftrace buffer empty) [ 50.858323] Kernel Offset: disabled [ 50.861917] Rebooting in 86400 seconds..