[ 17.039036] 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: [ 19.759583] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 20.103310] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 21.024963] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) [ 23.181144] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 28.568433] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) executing program [ 28.660360] kasan: CONFIG_KASAN_INLINE enabled [ 28.665773] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.679507] Dumping ftrace buffer: [ 28.683010] (ftrace buffer empty) [ 28.686691] Modules linked in: [ 28.689964] CPU: 0 PID: 3329 Comm: syzkaller545763 Not tainted 4.4.107-g610c835 #12 [ 28.697721] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.707039] task: ffff8801d23717c0 task.stack: ffff8800b4a60000 [ 28.713057] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.721282] RSP: 0018:ffff8800b4a679f0 EFLAGS: 00010a07 [ 28.726702] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 28.733939] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.741180] RBP: ffff8800b4a67a00 R08: 0000000000000001 R09: 0000000000000000 [ 28.749028] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.756264] R13: 0000000000000020 R14: ffff8801d23c0000 R15: dffffc0000000000 [ 28.763499] FS: 0000000001609880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.771702] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.778770] CR2: 0000000020ef0fe0 CR3: 00000001d2150000 CR4: 00000000001406f0 [ 28.786012] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.793248] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.800488] Stack: [ 28.802601] 0000000000000000 ffff8801d23c0158 ffff8800b4a67a60 ffffffff825b8cf1 [ 28.810547] ffff8801d23c0170 ffffed003a47802b ffffed003a47802e ffff8801d23c0168 [ 28.818496] dead4ead00000000 ffff8801d23c0140 0000000000000000 0000000000000000 [ 28.826442] Call Trace: [ 28.828998] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.835458] [] sg_finish_rem_req+0x2b5/0x340 [ 28.841495] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.847610] [] ? sg_get_rq_mark+0x142/0x190 [ 28.853549] [] sg_read+0x8c2/0x1490 [ 28.859491] [] ? __check_object_size+0x154/0x35b [ 28.865860] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.872498] [] ? fsnotify+0xee0/0xee0 [ 28.877916] [] ? avc_policy_seqno+0x9/0x20 [ 28.883767] [] do_loop_readv_writev+0x141/0x1e0 [ 28.890054] [] ? security_file_permission+0x89/0x1e0 [ 28.896772] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.903401] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.910032] [] do_readv_writev+0x5dd/0x6e0 [ 28.915900] [] ? vfs_write+0x530/0x530 [ 28.921408] [] ? handle_mm_fault+0xbf5/0x3190 [ 28.927517] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.933453] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.939570] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.946394] [] ? __fsnotify_parent+0xbc/0x340 [ 28.952881] [] ? avc_policy_seqno+0x9/0x20 [ 28.958734] [] vfs_readv+0x78/0xb0 [ 28.963891] [] SyS_readv+0xd9/0x240 [ 28.969146] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.975696] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.982248] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 28.988793] 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 [ 29.015113] RIP [] __free_pages+0x21/0x90 [ 29.020992] RSP [ 29.025137] ---[ end trace 32380050ac0387e1 ]--- [ 29.029882] Kernel panic - not syncing: Fatal exception [ 29.035847] Dumping ftrace buffer: [ 29.039355] (ftrace buffer empty) [ 29.043043] Kernel Offset: disabled [ 29.046641] Rebooting in 86400 seconds..