[ 16.454412] 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: [ 21.440749] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.729549] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.541355] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 22.713011] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 28.105922] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program [ 28.198197] kasan: CONFIG_KASAN_INLINE enabled [ 28.203134] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.215959] Dumping ftrace buffer: [ 28.219472] (ftrace buffer empty) [ 28.223155] Modules linked in: [ 28.226427] CPU: 0 PID: 3325 Comm: syzkaller233353 Not tainted 4.4.107-g610c835 #4 [ 28.234269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.243597] task: ffff8800b51cdf00 task.stack: ffff8801d0a20000 [ 28.249615] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.258213] RSP: 0018:ffff8801d0a27a40 EFLAGS: 00010a07 [ 28.263625] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.270859] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.278105] RBP: ffff8801d0a27a50 R08: 0000000000000001 R09: 0000000000000000 [ 28.285341] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.292575] R13: 0000000000000020 R14: ffff8800b473c200 R15: dffffc0000000000 [ 28.299813] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008610840 [ 28.308010] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.313856] CR2: 0000000020001000 CR3: 00000001d0ca5000 CR4: 00000000001406f0 [ 28.321094] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.328327] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.335560] Stack: [ 28.337675] 0000000000000000 ffff8800b473c358 ffff8801d0a27ab0 ffffffff825b8cf1 [ 28.345627] ffff8800b473c370 ffffed00168e786b ffffed00168e786e ffff8800b473c368 [ 28.353566] dead4ead00000000 ffff8800b473c340 0000000000000000 0000000000000000 [ 28.361529] Call Trace: [ 28.364085] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.370540] [] sg_finish_rem_req+0x2b5/0x340 [ 28.376560] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.382684] [] ? sg_get_rq_mark+0x142/0x190 [ 28.388619] [] sg_read+0x8c2/0x1490 [ 28.393864] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 28.401015] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.407646] [] ? __lock_is_held+0xa1/0xf0 [ 28.413407] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.420044] [] __vfs_read+0x103/0x440 [ 28.425457] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.431401] [] ? fsnotify+0x5ad/0xee0 [ 28.436813] [] ? fsnotify+0xee0/0xee0 [ 28.442229] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.448164] [] ? avc_policy_seqno+0x9/0x20 [ 28.454014] [] ? selinux_file_permission+0x348/0x460 [ 28.460731] [] ? security_file_permission+0x89/0x1e0 [ 28.467447] [] ? rw_verify_area+0x100/0x2f0 [ 28.473381] [] vfs_read+0x123/0x3a0 [ 28.478620] [] SyS_read+0xd9/0x1b0 [ 28.483775] [] ? do_sendfile+0xd30/0xd30 [ 28.489452] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.495644] [] ? do_sendfile+0xd30/0xd30 [ 28.501317] [] do_fast_syscall_32+0x314/0x890 [ 28.507425] [] sysenter_flags_fixed+0xd/0x17 [ 28.513443] 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 [ 28.539724] RIP [] __free_pages+0x21/0x90 [ 28.545602] RSP [ 28.549493] ---[ end trace b2908c3e2e83bf52 ]--- [ 28.554230] Kernel panic - not syncing: Fatal exception [ 28.559986] Dumping ftrace buffer: [ 28.563500] (ftrace buffer empty) [ 28.567183] Kernel Offset: disabled [ 28.570779] Rebooting in 86400 seconds..