[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.899042] 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: [ 20.146461] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.419018] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.193420] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) [ 21.355486] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) Warning: Permanently added '10.128.15.204' (ECDSA) to the list of known hosts. [ 26.714261] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 26.803401] kasan: CONFIG_KASAN_INLINE enabled [ 26.808185] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.820994] Dumping ftrace buffer: [ 26.824499] (ftrace buffer empty) [ 26.828350] Modules linked in: [ 26.831629] CPU: 0 PID: 3317 Comm: syzkaller774819 Not tainted 4.4.107-g610c835 #4 [ 26.839300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.848622] task: ffff8800b529df00 task.stack: ffff8800b53d8000 [ 26.854643] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.862877] RSP: 0018:ffff8800b53dfa40 EFLAGS: 00010a07 [ 26.868289] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 26.875524] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.882759] RBP: ffff8800b53dfa50 R08: 0000000000000001 R09: 0000000000000000 [ 26.890003] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.897240] R13: 0000000000000020 R14: ffff8800b4af4200 R15: dffffc0000000000 [ 26.904479] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000976a840 [ 26.912680] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.918533] CR2: 0000000020001000 CR3: 00000000b4aea000 CR4: 00000000001406f0 [ 26.925770] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.933006] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.940243] Stack: [ 26.942363] 0000000000000000 ffff8800b4af4358 ffff8800b53dfab0 ffffffff825b8cf1 [ 26.950323] ffff8800b4af4370 ffffed001695e86b ffffed001695e86e ffff8800b4af4368 [ 26.958276] dead4ead00000000 ffff8800b4af4340 0000000000000000 0000000000000000 [ 26.966223] Call Trace: [ 26.968777] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.975240] [] sg_finish_rem_req+0x2b5/0x340 [ 26.981263] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.987373] [] ? sg_get_rq_mark+0x142/0x190 [ 26.993307] [] sg_read+0x8c2/0x1490 [ 26.998557] [] ? save_stack_trace+0x26/0x50 [ 27.004492] [] ? save_stack+0x43/0xd0 [ 27.009905] [] ? kasan_slab_free+0x72/0xc0 [ 27.015756] [] ? kmem_cache_free+0xc7/0x320 [ 27.021693] [] ? putname+0xee/0x130 [ 27.026938] [] ? compat_SyS_open+0x2a/0x40 [ 27.032796] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.039426] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 27.046229] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.053120] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.059750] [] __vfs_read+0x103/0x440 [ 27.065172] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.072063] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.077999] [] ? fsnotify+0x5ad/0xee0 [ 27.083410] [] ? fsnotify+0xee0/0xee0 [ 27.088832] [] ? avc_policy_seqno+0x9/0x20 [ 27.094684] [] ? selinux_file_permission+0x348/0x460 [ 27.101401] [] ? security_file_permission+0x89/0x1e0 [ 27.108118] [] ? rw_verify_area+0x100/0x2f0 [ 27.114054] [] vfs_read+0x123/0x3a0 [ 27.119296] [] SyS_read+0xd9/0x1b0 [ 27.124451] [] ? do_sendfile+0xd30/0xd30 [ 27.130126] [] ? vmacache_update+0xfe/0x130 [ 27.136064] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.142261] [] ? do_sendfile+0xd30/0xd30 [ 27.147938] [] do_fast_syscall_32+0x314/0x890 [ 27.154055] [] sysenter_flags_fixed+0xd/0x17 [ 27.160075] 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 [ 27.186449] RIP [] __free_pages+0x21/0x90 [ 27.192333] RSP [ 27.195991] ---[ end trace 95eb9875608a9552 ]--- [ 27.200734] Kernel panic - not syncing: Fatal exception [ 27.206518] Dumping ftrace buffer: [ 27.210029] (ftrace buffer empty) [ 27.213706] Kernel Offset: disabled [ 27.217297] Rebooting in 86400 seconds..