[ 16.400786] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 21.223907] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.578357] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.381999] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) [ 22.556757] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) Warning: Permanently added '10.128.15.228' (ECDSA) to the list of known hosts. [ 27.956589] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) executing program [ 28.055766] kasan: CONFIG_KASAN_INLINE enabled [ 28.060508] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.073310] Dumping ftrace buffer: [ 28.076815] (ftrace buffer empty) [ 28.080493] Modules linked in: [ 28.083765] CPU: 0 PID: 3327 Comm: syzkaller208591 Not tainted 4.4.107-g610c835 #4 [ 28.091435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.100755] task: ffff8801d20cdf00 task.stack: ffff8800b0ac8000 [ 28.106777] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.115004] RSP: 0018:ffff8800b0acfa40 EFLAGS: 00010a07 [ 28.120415] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.127650] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.134887] RBP: ffff8800b0acfa50 R08: 0000000000000001 R09: 0000000000000000 [ 28.142122] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.149358] R13: 0000000000000020 R14: ffff8800b4742100 R15: dffffc0000000000 [ 28.156597] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000989c840 [ 28.164787] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.170633] CR2: 0000000020001000 CR3: 00000000b53fd000 CR4: 00000000001406f0 [ 28.177871] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.185125] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.192358] Stack: [ 28.194470] 0000000000000000 ffff8800b4742258 ffff8800b0acfab0 ffffffff825b8cf1 [ 28.202417] ffff8800b4742270 ffffed00168e844b ffffed00168e844e ffff8800b4742268 [ 28.210363] dead4ead00000000 ffff8800b4742240 0000000000000000 0000000000000000 [ 28.218323] Call Trace: [ 28.220881] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.227347] [] sg_finish_rem_req+0x2b5/0x340 [ 28.233371] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.239482] [] ? sg_get_rq_mark+0x142/0x190 [ 28.245416] [] sg_read+0x8c2/0x1490 [ 28.250658] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 28.257810] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.264441] [] ? __lock_is_held+0xa1/0xf0 [ 28.270207] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.276837] [] __vfs_read+0x103/0x440 [ 28.282257] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.288195] [] ? fsnotify+0x5ad/0xee0 [ 28.293609] [] ? fsnotify+0xee0/0xee0 [ 28.299025] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.304962] [] ? avc_policy_seqno+0x9/0x20 [ 28.310812] [] ? selinux_file_permission+0x348/0x460 [ 28.317529] [] ? security_file_permission+0x89/0x1e0 [ 28.324246] [] ? rw_verify_area+0x100/0x2f0 [ 28.330192] [] vfs_read+0x123/0x3a0 [ 28.335433] [] SyS_read+0xd9/0x1b0 [ 28.340588] [] ? do_sendfile+0xd30/0xd30 [ 28.346272] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.352475] [] ? do_sendfile+0xd30/0xd30 [ 28.358149] [] do_fast_syscall_32+0x314/0x890 [ 28.364258] [] sysenter_flags_fixed+0xd/0x17 [ 28.370278] 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 [ 28.396633] RIP [] __free_pages+0x21/0x90 [ 28.402509] RSP [ 28.406419] ---[ end trace 33a37812d5ae269b ]--- [ 28.411164] Kernel panic - not syncing: Fatal exception [ 28.416944] Dumping ftrace buffer: [ 28.420458] (ftrace buffer empty) [ 28.424135] Kernel Offset: disabled [ 28.427725] Rebooting in 86400 seconds..