[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.671616] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.883605] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.134875] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.212995] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 25.374999] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 30.474526] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program [ 30.877675] sd 0:0:1:0: [sg0] tag#176 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK [ 30.886303] sd 0:0:1:0: [sg0] tag#176 CDB: Test Unit Ready [ 30.891911] sd 0:0:1:0: [sg0] tag#176 CDB[00]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.896272] kasan: CONFIG_KASAN_INLINE enabled [ 30.896279] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.896284] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.896288] Dumping ftrace buffer: [ 30.896291] (ftrace buffer empty) [ 30.896294] Modules linked in: [ 30.896301] CPU: 1 PID: 3741 Comm: syzkaller334411 Not tainted 4.4.119-g024f962 #26 [ 30.896305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.896308] task: ffff8801c7c99800 task.stack: ffff8801d9300000 [ 30.896323] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 30.896326] RSP: 0018:ffff8801d9307b00 EFLAGS: 00010a07 [ 30.896330] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b856b [ 30.896334] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 30.896337] RBP: ffff8801d9307b10 R08: 0000000000000000 R09: 0000000000000001 [ 30.896340] R10: 0000000000000000 R11: 1ffff1003b260f3e R12: 0000000000000004 [ 30.896344] R13: 0000000000000020 R14: ffff8801d91c0000 R15: dffffc0000000000 [ 30.896349] FS: 00007f1a2a90f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.896353] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.896356] CR2: 00007f1a2a90ee78 CR3: 00000000ac13a000 CR4: 0000000000160670 [ 30.896364] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.896367] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.896368] Stack: [ 30.896376] 0000000000000246 ffff8801d91c0158 ffff8801d9307b70 ffffffff825b8591 [ 30.896383] ffff8801d91c0170 ffffed003b23802b ffffed003b23802e ffff8801d91c0168 [ 30.896390] dead4ead00000000 ffff8801d91c0140 0000000000000000 0000000000000000 [ 30.896391] Call Trace: [ 30.896403] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 30.896409] [] sg_finish_rem_req+0x2b5/0x340 [ 30.896415] [] sg_read+0xa1b/0x1490 [ 30.896422] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 30.896431] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.896437] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 30.896445] [] __vfs_read+0x103/0x440 [ 30.896451] [] ? vfs_iter_write+0x2d0/0x2d0 [ 30.896458] [] ? fsnotify+0x5ad/0xee0 [ 30.896463] [] ? fsnotify+0xee0/0xee0 [ 30.896471] [] ? avc_policy_seqno+0x9/0x20 [ 30.896477] [] ? selinux_file_permission+0x348/0x460 [ 30.896484] [] ? security_file_permission+0x89/0x1e0 [ 30.896489] [] ? rw_verify_area+0x100/0x2f0 [ 30.896494] [] vfs_read+0x123/0x3a0 [ 30.896499] [] SyS_read+0xd9/0x1b0 [ 30.896504] [] ? do_sendfile+0xd30/0xd30 [ 30.896511] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.896518] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 30.896605] Code: c6 a0 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 [ 30.896611] RIP [] __free_pages+0x21/0x90 [ 30.896613] RSP [ 30.896619] ---[ end trace c009ca1f1786a381 ]--- [ 30.896623] Kernel panic - not syncing: Fatal exception [ 30.901089] Dumping ftrace buffer: [ 30.901091] (ftrace buffer empty) [ 30.901093] Kernel Offset: disabled [ 31.228949] Rebooting in 86400 seconds..