[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.896094] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.754267] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.096240] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.027246] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) [ 28.192081] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 33.653494] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 33.771981] kasan: CONFIG_KASAN_INLINE enabled [ 33.776433] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.803490] Dumping ftrace buffer: [ 33.807004] (ftrace buffer empty) [ 33.810685] Modules linked in: [ 33.813965] CPU: 1 PID: 3796 Comm: syzkaller860551 Not tainted 4.4.120-gd63fdf6 #28 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 33.821728] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.831053] task: ffff8800b611c800 task.stack: ffff8800abb90000 [ 33.837078] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 33.845315] RSP: 0018:ffff8800abb97b00 EFLAGS: 00010a07 [ 33.850734] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 33.857973] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 33.865217] RBP: ffff8800abb97b10 R08: ffffed003b378f90 R09: ffff8801d9bc7c60 executing program executing program executing program executing program [ 33.872456] R10: 0000000000000005 R11: ffffed003b378f90 R12: 0000000000000004 [ 33.879698] R13: 0000000000000020 R14: ffff8800bb9b2100 R15: dffffc0000000000 [ 33.886943] FS: 00007f57c51be700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.895136] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.900989] CR2: 00007f57c51bde78 CR3: 00000000ab548000 CR4: 0000000000160670 [ 33.908233] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.915476] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 executing program executing program executing program executing program executing program executing program executing program executing program [ 33.922717] Stack: [ 33.924834] 0000000000000000 ffff8800bb9b2258 ffff8800abb97b70 ffffffff825b8611 [ 33.932803] ffff8800bb9b2270 ffffed001773644b ffffed001773644e ffff8800bb9b2268 [ 33.940767] dead4ead00000000 ffff8800bb9b2240 0000000000000000 0000000000000000 [ 33.948756] Call Trace: [ 33.951317] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 33.957805] [] sg_finish_rem_req+0x2b5/0x340 [ 33.963833] [] sg_read+0xa1b/0x1490 executing program executing program executing program executing program executing program executing program executing program [ 33.969079] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.975717] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 33.982701] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.989513] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.996150] [] __vfs_read+0x103/0x440 [ 34.001571] [] ? quarantine_put+0xab/0x180 [ 34.007426] [] ? vfs_iter_write+0x2d0/0x2d0 [ 34.013364] [] ? fsnotify+0x5ad/0xee0 executing program executing program executing program executing program executing program executing program executing program executing program [ 34.018781] [] ? fsnotify+0xee0/0xee0 [ 34.024204] [] ? avc_policy_seqno+0x9/0x20 [ 34.030080] [] ? selinux_file_permission+0x348/0x460 [ 34.036804] [] ? security_file_permission+0x89/0x1e0 [ 34.043525] [] ? rw_verify_area+0x100/0x2f0 [ 34.049466] [] vfs_read+0x123/0x3a0 [ 34.054713] [] SyS_read+0xd9/0x1b0 [ 34.059869] [] ? do_sendfile+0xd30/0xd30 [ 34.065552] [] ? lockdep_sys_exit_thunk+0x12/0x14 executing program executing program executing program executing program executing program [ 34.072017] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 34.078559] 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 [ 34.105109] RIP [] __free_pages+0x21/0x90 [ 34.110997] RSP [ 34.115168] ---[ end trace 87657c878a8dac7a ]--- [ 34.120059] Kernel panic - not syncing: Fatal exception [ 34.125773] Dumping ftrace buffer: [ 34.129289] (ftrace buffer empty) [ 34.132974] Kernel Offset: disabled [ 34.136575] Rebooting in 86400 seconds..