[ 15.394896] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting 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: [ 20.722527] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.050536] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.940593] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 37.774395] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 43.123929] random: nonblocking pool is initialized executing program [ 43.225069] kasan: CONFIG_KASAN_INLINE enabled [ 43.229985] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 43.242789] Dumping ftrace buffer: [ 43.246295] (ftrace buffer empty) [ 43.249974] Modules linked in: [ 43.253248] CPU: 0 PID: 3318 Comm: syzkaller915337 Not tainted 4.4.113-g202e079 #1 [ 43.260935] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.270259] task: ffff8801d1564740 task.stack: ffff8801d0948000 [ 43.276284] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 43.284514] RSP: 0018:ffff8801d094fab0 EFLAGS: 00010a07 [ 43.289938] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b6f2b [ 43.297176] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 43.304417] RBP: ffff8801d094fac0 R08: 0000000000000001 R09: 0000000000000001 [ 43.311658] R10: 0000000000000000 R11: 1ffff1003a129f34 R12: 0000000000000004 [ 43.318896] R13: 0000000000000020 R14: ffff8800b46cc200 R15: dffffc0000000000 [ 43.326135] FS: 0000000000e17880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 43.334329] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.340177] CR2: 0000000020a2f000 CR3: 00000001d08e6000 CR4: 0000000000160670 [ 43.347416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.354655] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.361892] Stack: [ 43.364009] 0000000000000246 ffff8800b46cc358 ffff8801d094fb20 ffffffff825b6f51 [ 43.371987] ffff8800b46cc370 ffffed00168d986b ffffed00168d986e ffff8800b46cc368 [ 43.379950] dead4ead00000000 ffff8800b46cc340 0000000000000000 0000000000000000 [ 43.387913] Call Trace: [ 43.390482] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 43.396944] [] sg_finish_rem_req+0x2b5/0x340 [ 43.402968] [] sg_new_read.isra.18+0x336/0x3c0 [ 43.409166] [] sg_read+0x8bc/0x1490 [ 43.414409] [] ? __lock_is_held+0xa1/0xf0 [ 43.420173] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 43.426808] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 43.433789] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 43.440425] [] __vfs_read+0x103/0x440 [ 43.445845] [] ? vfs_iter_write+0x2d0/0x2d0 [ 43.451782] [] ? fsnotify+0x5ad/0xee0 [ 43.457196] [] ? fsnotify+0xee0/0xee0 [ 43.462615] [] ? avc_policy_seqno+0x9/0x20 [ 43.468467] [] ? selinux_file_permission+0x348/0x460 [ 43.475185] [] ? security_file_permission+0x89/0x1e0 [ 43.481904] [] ? rw_verify_area+0x100/0x2f0 [ 43.487840] [] vfs_read+0x123/0x3a0 [ 43.493082] [] SyS_read+0xd9/0x1b0 [ 43.498236] [] ? do_sendfile+0xd30/0xd30 [ 43.503922] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 43.510389] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 43.516943] Code: b6 9f 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 [ 43.543423] RIP [] __free_pages+0x21/0x90 [ 43.549304] RSP [ 43.553095] ---[ end trace 0f470cabf8f6c476 ]--- [ 43.557829] Kernel panic - not syncing: Fatal exception [ 43.563577] Dumping ftrace buffer: [ 43.567097] (ftrace buffer empty) [ 43.570777] Kernel Offset: disabled [ 43.574372] Rebooting in 86400 seconds..