[ 16.002611] 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: [ 21.518244] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.786825] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.569065] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) [ 29.182288] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. [ 34.546847] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) executing program [ 34.638208] kasan: CONFIG_KASAN_INLINE enabled [ 34.643003] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.655795] Dumping ftrace buffer: [ 34.659301] (ftrace buffer empty) [ 34.662979] Modules linked in: [ 34.666250] CPU: 0 PID: 3329 Comm: syzkaller768391 Not tainted 4.4.107-g610c835 #4 [ 34.673921] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.683242] task: ffff8801d23dc740 task.stack: ffff8800b4278000 [ 34.689261] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 34.697487] RSP: 0018:ffff8800b427fa40 EFLAGS: 00010a07 [ 34.702899] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 34.710134] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 34.717373] RBP: ffff8800b427fa50 R08: 0000000000000001 R09: 0000000000000000 [ 34.724607] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 34.731846] R13: 0000000000000020 R14: ffff8800b42b0000 R15: dffffc0000000000 [ 34.739084] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008488840 [ 34.747290] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.753138] CR2: 0000000020001000 CR3: 00000000b1fef000 CR4: 00000000001406f0 [ 34.760376] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.767611] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.774846] Stack: [ 34.776960] 0000000000000000 ffff8800b42b0158 ffff8800b427fab0 ffffffff825b8cf1 [ 34.784901] ffff8800b42b0170 ffffed001685602b ffffed001685602e ffff8800b42b0168 [ 34.792845] dead4ead00000000 ffff8800b42b0140 0000000000000000 0000000000000000 [ 34.800801] Call Trace: [ 34.803357] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 34.809824] [] sg_finish_rem_req+0x2b5/0x340 [ 34.815848] [] sg_new_read.isra.18+0x39/0x3c0 [ 34.821956] [] ? sg_get_rq_mark+0x142/0x190 [ 34.827890] [] sg_read+0x8c2/0x1490 [ 34.833130] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 34.840282] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.846917] [] ? __lock_is_held+0xa1/0xf0 [ 34.852679] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.859319] [] __vfs_read+0x103/0x440 [ 34.864742] [] ? vfs_iter_write+0x2d0/0x2d0 [ 34.870682] [] ? fsnotify+0x5ad/0xee0 [ 34.876094] [] ? fsnotify+0xee0/0xee0 [ 34.881509] [] ? _raw_spin_unlock+0x2c/0x50 [ 34.887455] [] ? avc_policy_seqno+0x9/0x20 [ 34.893303] [] ? selinux_file_permission+0x348/0x460 [ 34.900021] [] ? security_file_permission+0x89/0x1e0 [ 34.906741] [] ? rw_verify_area+0x100/0x2f0 [ 34.912680] [] vfs_read+0x123/0x3a0 [ 34.917921] [] SyS_read+0xd9/0x1b0 [ 34.923082] [] ? do_sendfile+0xd30/0xd30 [ 34.928763] [] ? do_fast_syscall_32+0xd7/0x890 [ 34.934960] [] ? do_sendfile+0xd30/0xd30 [ 34.940635] [] do_fast_syscall_32+0x314/0x890 [ 34.946749] [] sysenter_flags_fixed+0xd/0x17 [ 34.952767] 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 [ 34.979043] RIP [] __free_pages+0x21/0x90 [ 34.984924] RSP [ 34.989237] ---[ end trace d235aefc88711ad0 ]--- [ 34.994297] Kernel panic - not syncing: Fatal exception [ 35.000073] Dumping ftrace buffer: [ 35.003824] (ftrace buffer empty) [ 35.007506] Kernel Offset: disabled [ 35.011101] Rebooting in 86400 seconds..