[ 16.202402] 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: [ 20.268612] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.556379] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.448491] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 23.902877] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.15.216' (ECDSA) to the list of known hosts. [ 29.283562] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program [ 29.379967] kasan: CONFIG_KASAN_INLINE enabled [ 29.384887] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.397687] Dumping ftrace buffer: [ 29.401193] (ftrace buffer empty) [ 29.404878] Modules linked in: [ 29.408154] CPU: 0 PID: 3320 Comm: syzkaller039359 Not tainted 4.4.107-g610c835 #4 [ 29.415826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.425145] task: ffff8801d2080000 task.stack: ffff8801d0718000 [ 29.431253] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.439477] RSP: 0018:ffff8801d071fa40 EFLAGS: 00010a07 [ 29.444897] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 29.452137] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.459372] RBP: ffff8801d071fa50 R08: 0000000000000001 R09: 0000000000000000 [ 29.466605] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.473840] R13: 0000000000000020 R14: ffff8801d0750000 R15: dffffc0000000000 [ 29.481078] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008ea1840 [ 29.489269] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.495114] CR2: 0000000020001000 CR3: 00000001d1a2f000 CR4: 00000000001406f0 [ 29.502367] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.509607] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.516843] Stack: [ 29.518966] 0000000000000000 ffff8801d0750158 ffff8801d071fab0 ffffffff825b8cf1 [ 29.526906] ffff8801d0750170 ffffed003a0ea02b ffffed003a0ea02e ffff8801d0750168 [ 29.534849] dead4ead00000000 ffff8801d0750140 0000000000000000 0000000000000000 [ 29.542789] Call Trace: [ 29.545342] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.551798] [] sg_finish_rem_req+0x2b5/0x340 [ 29.557822] [] sg_new_read.isra.18+0x39/0x3c0 [ 29.564386] [] ? sg_get_rq_mark+0x142/0x190 [ 29.570337] [] sg_read+0x8c2/0x1490 [ 29.575585] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 29.582736] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.589366] [] ? __lock_is_held+0xa1/0xf0 [ 29.595131] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.601764] [] __vfs_read+0x103/0x440 [ 29.607178] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.613112] [] ? fsnotify+0x5ad/0xee0 [ 29.618526] [] ? fsnotify+0xee0/0xee0 [ 29.623943] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.629882] [] ? avc_policy_seqno+0x9/0x20 [ 29.635818] [] ? selinux_file_permission+0x348/0x460 [ 29.642542] [] ? security_file_permission+0x89/0x1e0 [ 29.649262] [] ? rw_verify_area+0x100/0x2f0 [ 29.655196] [] vfs_read+0x123/0x3a0 [ 29.660440] [] SyS_read+0xd9/0x1b0 [ 29.665594] [] ? do_sendfile+0xd30/0xd30 [ 29.671271] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.677468] [] ? do_sendfile+0xd30/0xd30 [ 29.683141] [] do_fast_syscall_32+0x314/0x890 [ 29.689259] [] sysenter_flags_fixed+0xd/0x17 [ 29.695291] 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 [ 29.721520] RIP [] __free_pages+0x21/0x90 [ 29.727395] RSP [ 29.734483] ---[ end trace 8b9e5484e5715679 ]--- [ 29.739227] Kernel panic - not syncing: Fatal exception [ 29.744909] Dumping ftrace buffer: [ 29.748420] (ftrace buffer empty) [ 29.752106] Kernel Offset: disabled [ 29.755700] Rebooting in 86400 seconds..