[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.148773] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.567353] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.898493] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.631182] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) [ 33.474717] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 38.848275] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) executing program [ 38.944764] kasan: CONFIG_KASAN_INLINE enabled [ 38.949190] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.962006] Dumping ftrace buffer: [ 38.965513] (ftrace buffer empty) [ 38.969189] Modules linked in: [ 38.972460] CPU: 1 PID: 3326 Comm: syzkaller977906 Not tainted 4.4.107-g610c835 #4 [ 38.980129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.989458] task: ffff8801d1bfc740 task.stack: ffff8800b4140000 [ 38.995480] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 39.003706] RSP: 0018:ffff8800b4147a40 EFLAGS: 00010a07 [ 39.009117] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 39.016353] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 39.023701] RBP: ffff8800b4147a50 R08: 0000000000000001 R09: 0000000000000000 [ 39.030936] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 39.038173] R13: 0000000000000020 R14: ffff8801d174a100 R15: dffffc0000000000 [ 39.045419] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009b92840 [ 39.053614] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.059463] CR2: 0000000020001000 CR3: 00000000b7e0f000 CR4: 00000000001406e0 [ 39.066700] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.073939] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.081174] Stack: [ 39.083292] 0000000000000000 ffff8801d174a258 ffff8800b4147ab0 ffffffff825b8cf1 [ 39.091260] ffff8801d174a270 ffffed003a2e944b ffffed003a2e944e ffff8801d174a268 [ 39.099217] dead4ead00000000 ffff8801d174a240 0000000000000000 0000000000000000 [ 39.107170] Call Trace: [ 39.109729] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 39.116195] [] sg_finish_rem_req+0x2b5/0x340 [ 39.122226] [] sg_new_read.isra.18+0x39/0x3c0 [ 39.128345] [] ? sg_get_rq_mark+0x142/0x190 [ 39.134284] [] sg_read+0x8c2/0x1490 [ 39.139529] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 39.146690] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.153322] [] ? __lock_is_held+0xa1/0xf0 [ 39.159087] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 39.165721] [] __vfs_read+0x103/0x440 [ 39.171147] [] ? vfs_iter_write+0x2d0/0x2d0 [ 39.177086] [] ? fsnotify+0x5ad/0xee0 [ 39.182500] [] ? fsnotify+0xee0/0xee0 [ 39.187915] [] ? _raw_spin_unlock+0x2c/0x50 [ 39.193853] [] ? avc_policy_seqno+0x9/0x20 [ 39.199703] [] ? selinux_file_permission+0x348/0x460 [ 39.206431] [] ? security_file_permission+0x89/0x1e0 [ 39.213159] [] ? rw_verify_area+0x100/0x2f0 [ 39.219095] [] vfs_read+0x123/0x3a0 [ 39.224339] [] SyS_read+0xd9/0x1b0 [ 39.229496] [] ? do_sendfile+0xd30/0xd30 [ 39.235185] [] ? do_fast_syscall_32+0xd7/0x890 [ 39.241391] [] ? do_sendfile+0xd30/0xd30 [ 39.247068] [] do_fast_syscall_32+0x314/0x890 [ 39.253187] [] sysenter_flags_fixed+0xd/0x17 [ 39.259211] 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 [ 39.285612] RIP [] __free_pages+0x21/0x90 [ 39.291501] RSP [ 39.295298] ---[ end trace 62dfc6270cf3d404 ]--- [ 39.300035] Kernel panic - not syncing: Fatal exception [ 39.305733] Dumping ftrace buffer: [ 39.309239] (ftrace buffer empty) [ 39.312916] Kernel Offset: disabled [ 39.316520] Rebooting in 86400 seconds..