[ 15.733824] 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: [ 20.768163] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.023580] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.859106] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 36.919391] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. [ 42.308050] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program [ 42.407987] kasan: CONFIG_KASAN_INLINE enabled [ 42.412412] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.425260] Dumping ftrace buffer: [ 42.428765] (ftrace buffer empty) [ 42.432450] Modules linked in: [ 42.435727] CPU: 1 PID: 3319 Comm: syzkaller478196 Not tainted 4.4.107-g610c835 #12 [ 42.443484] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.452814] task: ffff8800b4892f80 task.stack: ffff8801d0588000 [ 42.458836] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 42.467070] RSP: 0018:ffff8801d058fab0 EFLAGS: 00010a07 [ 42.472484] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 42.479722] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 42.486958] RBP: ffff8801d058fac0 R08: 0000000000000001 R09: 0000000000000000 [ 42.494204] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 42.501440] R13: 0000000000000020 R14: ffff8800b4042100 R15: dffffc0000000000 [ 42.508677] FS: 0000000001481880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 42.516875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.522729] CR2: 0000000020001000 CR3: 00000001d141a000 CR4: 00000000001406e0 [ 42.529968] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.537205] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.544447] Stack: [ 42.546561] 0000000000000000 ffff8800b4042258 ffff8801d058fb20 ffffffff825b8cf1 [ 42.554506] ffff8800b4042270 ffffed001680844b ffffed001680844e ffff8800b4042268 [ 42.562461] dead4ead00000000 ffff8800b4042240 0000000000000000 0000000000000000 [ 42.570403] Call Trace: [ 42.572957] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 42.579414] [] sg_finish_rem_req+0x2b5/0x340 [ 42.585439] [] sg_new_read.isra.18+0x39/0x3c0 [ 42.591550] [] ? sg_get_rq_mark+0x142/0x190 [ 42.597496] [] sg_read+0x8c2/0x1490 [ 42.602737] [] ? __lock_is_held+0xa1/0xf0 [ 42.608509] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.615141] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 42.622119] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.628759] [] __vfs_read+0x103/0x440 [ 42.634175] [] ? vfs_iter_write+0x2d0/0x2d0 [ 42.640110] [] ? fsnotify+0x5ad/0xee0 [ 42.645525] [] ? fsnotify+0xee0/0xee0 [ 42.650942] [] ? avc_policy_seqno+0x9/0x20 [ 42.656794] [] ? selinux_file_permission+0x348/0x460 [ 42.663510] [] ? security_file_permission+0x89/0x1e0 [ 42.670238] [] ? rw_verify_area+0x100/0x2f0 [ 42.676173] [] vfs_read+0x123/0x3a0 [ 42.681414] [] SyS_read+0xd9/0x1b0 [ 42.686576] [] ? do_sendfile+0xd30/0xd30 [ 42.692259] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 42.698718] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 42.705260] 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 [ 42.731524] RIP [] __free_pages+0x21/0x90 [ 42.737412] RSP [ 42.741228] ---[ end trace f3e458ed35be8e96 ]--- [ 42.746666] Kernel panic - not syncing: Fatal exception [ 42.752391] Dumping ftrace buffer: [ 42.755897] (ftrace buffer empty) [ 42.759573] Kernel Offset: disabled [ 42.763164] Rebooting in 86400 seconds..