[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.525846] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.518707] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.889872] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.739920] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 38.771652] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.15.226' (ECDSA) to the list of known hosts. [ 44.164551] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) executing program [ 44.255259] kasan: CONFIG_KASAN_INLINE enabled [ 44.260159] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 44.272981] Dumping ftrace buffer: [ 44.276500] (ftrace buffer empty) [ 44.280179] Modules linked in: [ 44.283451] CPU: 0 PID: 3317 Comm: syzkaller715884 Not tainted 4.4.107-g610c835 #4 [ 44.291123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.300445] task: ffff8801d15a97c0 task.stack: ffff8800b42b8000 [ 44.306467] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 44.314697] RSP: 0018:ffff8800b42bfa40 EFLAGS: 00010a07 [ 44.320122] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 44.327360] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 44.334605] RBP: ffff8800b42bfa50 R08: 0000000000000001 R09: 0000000000000000 [ 44.342191] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 44.349427] R13: 0000000000000020 R14: ffff8800b38b0000 R15: dffffc0000000000 [ 44.356667] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000943c840 [ 44.364861] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 44.370716] CR2: 0000000020001000 CR3: 00000000b431b000 CR4: 00000000001406f0 [ 44.377954] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.385190] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.392428] Stack: [ 44.394549] 0000000000000000 ffff8800b38b0158 ffff8800b42bfab0 ffffffff825b8cf1 [ 44.403279] ffff8800b38b0170 ffffed001671602b ffffed001671602e ffff8800b38b0168 [ 44.411246] dead4ead00000000 ffff8800b38b0140 0000000000000000 0000000000000000 [ 44.419197] Call Trace: [ 44.421753] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 44.428229] [] sg_finish_rem_req+0x2b5/0x340 [ 44.434255] [] sg_new_read.isra.18+0x39/0x3c0 [ 44.440367] [] ? sg_get_rq_mark+0x142/0x190 [ 44.446303] [] sg_read+0x8c2/0x1490 [ 44.451552] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 44.458709] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 44.465355] [] ? __lock_is_held+0xa1/0xf0 [ 44.471121] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 44.477754] [] __vfs_read+0x103/0x440 [ 44.483173] [] ? vfs_iter_write+0x2d0/0x2d0 [ 44.489111] [] ? fsnotify+0x5ad/0xee0 [ 44.494526] [] ? fsnotify+0xee0/0xee0 [ 44.499953] [] ? _raw_spin_unlock+0x2c/0x50 [ 44.505893] [] ? avc_policy_seqno+0x9/0x20 [ 44.511755] [] ? selinux_file_permission+0x348/0x460 [ 44.518474] [] ? security_file_permission+0x89/0x1e0 [ 44.525236] [] ? rw_verify_area+0x100/0x2f0 [ 44.531188] [] vfs_read+0x123/0x3a0 [ 44.536446] [] SyS_read+0xd9/0x1b0 [ 44.541606] [] ? do_sendfile+0xd30/0xd30 [ 44.547295] [] ? do_fast_syscall_32+0xd7/0x890 [ 44.553504] [] ? do_sendfile+0xd30/0xd30 [ 44.559192] [] do_fast_syscall_32+0x314/0x890 [ 44.565317] [] sysenter_flags_fixed+0xd/0x17 [ 44.571347] 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 [ 44.598010] RIP [] __free_pages+0x21/0x90 [ 44.603895] RSP [ 44.607889] ---[ end trace f86ef7f831baf5c7 ]--- [ 44.612624] Kernel panic - not syncing: Fatal exception [ 44.618349] Dumping ftrace buffer: [ 44.621864] (ftrace buffer empty) [ 44.625551] Kernel Offset: disabled [ 44.629160] Rebooting in 86400 seconds..