[ 16.194049] 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: [ 21.734364] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.190890] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.098652] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 23.269518] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 28.641554] random: nonblocking pool is initialized executing program [ 28.751025] kasan: CONFIG_KASAN_INLINE enabled [ 28.755455] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.768266] Dumping ftrace buffer: [ 28.771772] (ftrace buffer empty) [ 28.775448] Modules linked in: [ 28.778719] CPU: 0 PID: 3313 Comm: syzkaller689624 Not tainted 4.4.107-g610c835 #4 [ 28.786388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.795709] task: ffff8801d0c18000 task.stack: ffff8800b42a0000 [ 28.801730] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.809959] RSP: 0018:ffff8800b42a7a40 EFLAGS: 00010a07 [ 28.815371] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.822609] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.829844] RBP: ffff8800b42a7a50 R08: 0000000000000001 R09: 0000000000000000 [ 28.837083] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.844321] R13: 0000000000000020 R14: ffff8800b42a8000 R15: dffffc0000000000 [ 28.851558] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009627840 [ 28.859751] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.865596] CR2: 0000000020001000 CR3: 00000000b4cb8000 CR4: 00000000001406f0 [ 28.872834] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.880068] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.887302] Stack: [ 28.889416] 0000000000000000 ffff8800b42a8158 ffff8800b42a7ab0 ffffffff825b8cf1 [ 28.897361] ffff8800b42a8170 ffffed001685502b ffffed001685502e ffff8800b42a8168 [ 28.905319] dead4ead00000000 ffff8800b42a8140 0000000000000000 0000000000000000 [ 28.913273] Call Trace: [ 28.915834] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.922291] [] sg_finish_rem_req+0x2b5/0x340 [ 28.928313] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.934424] [] ? sg_get_rq_mark+0x142/0x190 [ 28.940361] [] sg_read+0x8c2/0x1490 [ 28.945604] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 28.952760] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.959393] [] ? __lock_is_held+0xa1/0xf0 [ 28.965158] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.971791] [] __vfs_read+0x103/0x440 [ 28.977206] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.983151] [] ? fsnotify+0x5ad/0xee0 [ 28.988567] [] ? fsnotify+0xee0/0xee0 [ 28.993989] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.999929] [] ? avc_policy_seqno+0x9/0x20 [ 29.005780] [] ? selinux_file_permission+0x348/0x460 [ 29.012500] [] ? security_file_permission+0x89/0x1e0 [ 29.019219] [] ? rw_verify_area+0x100/0x2f0 [ 29.025157] [] vfs_read+0x123/0x3a0 [ 29.030401] [] SyS_read+0xd9/0x1b0 [ 29.035572] [] ? do_sendfile+0xd30/0xd30 [ 29.041259] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.047459] [] ? do_sendfile+0xd30/0xd30 [ 29.053134] [] do_fast_syscall_32+0x314/0x890 [ 29.059245] [] sysenter_flags_fixed+0xd/0x17 [ 29.065263] 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 [ 29.091588] RIP [] __free_pages+0x21/0x90 [ 29.097467] RSP [ 29.101493] ---[ end trace d92ab8745f25be69 ]--- [ 29.106240] Kernel panic - not syncing: Fatal exception [ 29.111618] Dumping ftrace buffer: [ 29.115145] (ftrace buffer empty) [ 29.118822] Kernel Offset: disabled [ 29.122415] Rebooting in 86400 seconds..