[ 16.092005] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.864538] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.125483] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.928782] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 21.095605] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 26.469273] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 26.566641] kasan: CONFIG_KASAN_INLINE enabled [ 26.571583] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.584375] Dumping ftrace buffer: [ 26.587879] (ftrace buffer empty) [ 26.591555] Modules linked in: [ 26.594865] CPU: 0 PID: 3316 Comm: syzkaller185145 Not tainted 4.4.107-g610c835 #4 [ 26.602535] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.611942] task: ffff8801d2b197c0 task.stack: ffff8800b3408000 [ 26.617974] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.626206] RSP: 0018:ffff8800b340fa40 EFLAGS: 00010a07 [ 26.631626] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 26.638862] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.646096] RBP: ffff8800b340fa50 R08: 0000000000000001 R09: 0000000000000000 [ 26.653338] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.660581] R13: 0000000000000020 R14: ffff8800b3518000 R15: dffffc0000000000 [ 26.667818] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009172840 [ 26.676008] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.681861] CR2: 0000000020001000 CR3: 00000000b44dd000 CR4: 00000000001406f0 [ 26.689098] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.696334] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.703570] Stack: [ 26.705683] 0000000000000000 ffff8800b3518158 ffff8800b340fab0 ffffffff825b8cf1 [ 26.713627] ffff8800b3518170 ffffed00166a302b ffffed00166a302e ffff8800b3518168 [ 26.721576] dead4ead00000000 ffff8800b3518140 0000000000000000 0000000000000000 [ 26.729515] Call Trace: [ 26.732070] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.738525] [] sg_finish_rem_req+0x2b5/0x340 [ 26.744567] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.750676] [] ? sg_get_rq_mark+0x142/0x190 [ 26.756610] [] sg_read+0x8c2/0x1490 [ 26.761852] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 26.769001] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.775650] [] ? __lock_is_held+0xa1/0xf0 [ 26.781412] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.788043] [] __vfs_read+0x103/0x440 [ 26.793457] [] ? vfs_iter_write+0x2d0/0x2d0 [ 26.799394] [] ? fsnotify+0x5ad/0xee0 [ 26.804807] [] ? fsnotify+0xee0/0xee0 [ 26.810222] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.816160] [] ? avc_policy_seqno+0x9/0x20 [ 26.822007] [] ? selinux_file_permission+0x348/0x460 [ 26.828723] [] ? security_file_permission+0x89/0x1e0 [ 26.835440] [] ? rw_verify_area+0x100/0x2f0 [ 26.841383] [] vfs_read+0x123/0x3a0 [ 26.846630] [] SyS_read+0xd9/0x1b0 [ 26.851786] [] ? do_sendfile+0xd30/0xd30 [ 26.857462] [] ? do_fast_syscall_32+0xd7/0x890 [ 26.863659] [] ? do_sendfile+0xd30/0xd30 [ 26.869333] [] do_fast_syscall_32+0x314/0x890 [ 26.875443] [] sysenter_flags_fixed+0xd/0x17 [ 26.881462] 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 [ 26.907700] RIP [] __free_pages+0x21/0x90 [ 26.913577] RSP [ 26.917454] ---[ end trace b7d9853a30221c48 ]--- [ 26.923274] Kernel panic - not syncing: Fatal exception [ 26.929021] Dumping ftrace buffer: [ 26.932529] (ftrace buffer empty) [ 26.936207] Kernel Offset: disabled [ 26.939798] Rebooting in 86400 seconds..