[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting O[ 16.131662] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) penBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.079641] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.420989] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.352841] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) [ 22.516809] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) Warning: Permanently added '10.128.15.221' (ECDSA) to the list of known hosts. [ 27.899378] random: sshd: uninitialized urandom read (32 bytes read, 128 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 [ 28.011112] 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 [ 28.059199] IPVS: Creating netns size=2552 id=2 executing program executing program executing program executing program [ 28.106752] random: nonblocking pool is initialized [ 28.108628] kasan: CONFIG_KASAN_INLINE enabled [ 28.108636] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.108640] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.108644] Dumping ftrace buffer: [ 28.108648] (ftrace buffer empty) [ 28.108651] Modules linked in: [ 28.108658] CPU: 1 PID: 3329 Comm: syzkaller047051 Not tainted 4.4.107-g610c835 #4 [ 28.108661] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.108665] task: ffff8800b40517c0 task.stack: ffff8800b7cf8000 [ 28.108681] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.108685] RSP: 0018:ffff8800b7cff970 EFLAGS: 00010a07 [ 28.108688] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.108692] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.108695] RBP: ffff8800b7cff980 R08: 0000000000000001 R09: 0000000000000000 [ 28.108698] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.108702] R13: 0000000000000020 R14: ffff8801d00d2100 R15: dffffc0000000000 [ 28.108707] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008aaa840 [ 28.108711] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.108714] CR2: 0000000020a77fc0 CR3: 00000000b41f0000 CR4: 00000000001406e0 [ 28.108720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.108723] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.108724] Stack: [ 28.108732] 0000000000000000 ffff8801d00d2258 ffff8800b7cff9e0 ffffffff825b8cf1 [ 28.108739] ffff8801d00d2270 ffffed003a01a44b ffffed003a01a44e ffff8801d00d2268 [ 28.108746] dead4ead00000000 ffff8801d00d2240 0000000000000000 0000000000000000 [ 28.108747] Call Trace: [ 28.108757] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.108764] [] sg_finish_rem_req+0x2b5/0x340 [ 28.108771] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.108777] [] ? sg_get_rq_mark+0x142/0x190 [ 28.108783] [] sg_read+0x8c2/0x1490 [ 28.108790] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.108796] [] ? fsnotify+0xee0/0xee0 [ 28.108804] [] ? avc_policy_seqno+0x9/0x20 [ 28.108813] [] do_loop_readv_writev+0x141/0x1e0 [ 28.108819] [] ? security_file_permission+0x89/0x1e0 [ 28.108826] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.108832] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.108839] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.108845] [] ? vfs_writev+0xb0/0xb0 [ 28.108852] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.108860] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.108866] [] ? rw_verify_area+0x100/0x2f0 [ 28.108872] [] compat_readv+0xd9/0x140 [ 28.108878] [] compat_SyS_readv+0xd8/0x1b0 [ 28.108883] [] ? SyS_pwritev+0x230/0x230 [ 28.108890] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.108895] [] ? SyS_pwritev+0x230/0x230 [ 28.108901] [] do_fast_syscall_32+0x314/0x890 [ 28.108907] [] sysenter_flags_fixed+0xd/0x17 [ 28.108998] Code: 76 ae 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 [ 28.109004] RIP [] __free_pages+0x21/0x90 [ 28.109006] RSP [ 28.109012] ---[ end trace 67b477d066b7974f ]--- [ 28.109015] Kernel panic - not syncing: Fatal exception [ 28.459420] Dumping ftrace buffer: [ 28.462934] (ftrace buffer empty) [ 28.466609] Kernel Offset: disabled [ 28.470201] Rebooting in 86400 seconds..