[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.984575] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.883661] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.199921] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.024179] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 25.521815] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.15.228' (ECDSA) to the list of known hosts. [ 30.894343] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program [ 30.996406] sg_write: data in/out 29964/54 bytes for SCSI command 0x10-- guessing data in; [ 30.996406] program syzkaller133627 not setting count and/or reply_len properly [ 31.012869] kasan: CONFIG_KASAN_INLINE enabled [ 31.017250] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.030081] Dumping ftrace buffer: [ 31.033614] (ftrace buffer empty) [ 31.037294] Modules linked in: [ 31.040571] CPU: 0 PID: 3321 Comm: syzkaller133627 Not tainted 4.4.107-g610c835 #4 [ 31.048241] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.057569] task: ffff8801d1bb8000 task.stack: ffff8801cc920000 [ 31.063590] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 31.071827] RSP: 0018:ffff8801cc927a40 EFLAGS: 00010a07 [ 31.077241] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 31.084484] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.091729] RBP: ffff8801cc927a50 R08: 0000000000000001 R09: 0000000000000000 [ 31.098966] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 31.106202] R13: 0000000000000020 R14: ffff8801d0a22100 R15: dffffc0000000000 [ 31.113526] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009586840 [ 31.121727] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.127576] CR2: 0000000020001000 CR3: 00000001d0869000 CR4: 00000000001406f0 [ 31.134822] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.142061] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.149296] Stack: [ 31.151409] 0000000000000000 ffff8801d0a22258 ffff8801cc927ab0 ffffffff825b8cf1 [ 31.159356] ffff8801d0a22270 ffffed003a14444b ffffed003a14444e ffff8801d0a22268 [ 31.167317] dead4ead00000000 ffff8801d0a22240 0000000000000000 0000000000000000 [ 31.175277] Call Trace: [ 31.177831] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 31.184291] [] sg_finish_rem_req+0x2b5/0x340 [ 31.190314] [] sg_new_read.isra.18+0x39/0x3c0 [ 31.196425] [] ? sg_get_rq_mark+0x142/0x190 [ 31.202360] [] sg_read+0x8c2/0x1490 [ 31.207614] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 31.214767] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.221400] [] ? __lock_is_held+0xa1/0xf0 [ 31.227163] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 31.233796] [] __vfs_read+0x103/0x440 [ 31.239215] [] ? vfs_iter_write+0x2d0/0x2d0 [ 31.245161] [] ? fsnotify+0x5ad/0xee0 [ 31.250575] [] ? fsnotify+0xee0/0xee0 [ 31.255990] [] ? _raw_spin_unlock+0x2c/0x50 [ 31.261925] [] ? avc_policy_seqno+0x9/0x20 [ 31.267790] [] ? selinux_file_permission+0x348/0x460 [ 31.274507] [] ? security_file_permission+0x89/0x1e0 [ 31.281224] [] ? rw_verify_area+0x100/0x2f0 [ 31.287160] [] vfs_read+0x123/0x3a0 [ 31.292402] [] SyS_read+0xd9/0x1b0 [ 31.297573] [] ? do_sendfile+0xd30/0xd30 [ 31.303253] [] ? do_fast_syscall_32+0xd7/0x890 [ 31.309458] [] ? do_sendfile+0xd30/0xd30 [ 31.315131] [] do_fast_syscall_32+0x314/0x890 [ 31.321240] [] sysenter_flags_fixed+0xd/0x17 [ 31.327263] 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 [ 31.353693] RIP [] __free_pages+0x21/0x90 [ 31.359569] RSP [ 31.363456] ---[ end trace 35216aead4029b42 ]--- [ 31.368183] Kernel panic - not syncing: Fatal exception [ 31.373853] Dumping ftrace buffer: [ 31.377366] (ftrace buffer empty) [ 31.381043] Kernel Offset: disabled [ 31.384645] Rebooting in 86400 seconds..