[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.298696] 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: [ 20.030523] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.293989] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.113830] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 21.278059] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.15.244' (ECDSA) to the list of known hosts. [ 26.643047] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) executing program [ 26.738465] kasan: CONFIG_KASAN_INLINE enabled [ 26.743369] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.756159] Dumping ftrace buffer: [ 26.759660] (ftrace buffer empty) [ 26.763336] Modules linked in: [ 26.766604] CPU: 1 PID: 3309 Comm: syzkaller752867 Not tainted 4.4.110-g618a510 #15 [ 26.774362] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.783682] task: ffff8801d16fc740 task.stack: ffff8800b81b8000 [ 26.789702] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.797927] RSP: 0018:ffff8800b81bfa40 EFLAGS: 00010a07 [ 26.803336] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 26.810576] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.817808] RBP: ffff8800b81bfa50 R08: 0000000000000001 R09: 0000000000000000 [ 26.825040] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.832275] R13: 0000000000000020 R14: ffff8800b4cf2100 R15: dffffc0000000000 [ 26.839509] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008f30840 [ 26.847703] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.853548] CR2: 0000000020000000 CR3: 00000000b7c86000 CR4: 0000000000160670 [ 26.860783] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.868016] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.875254] Stack: [ 26.877364] 0000000000000000 ffff8800b4cf2258 ffff8800b81bfab0 ffffffff825b9c81 [ 26.885306] ffff8800b4cf2270 ffffed001699e44b ffffed001699e44e ffff8800b4cf2268 [ 26.893244] dead4ead00000000 ffff8800b4cf2240 0000000000000000 0000000000000000 [ 26.901210] Call Trace: [ 26.903769] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.910222] [] sg_finish_rem_req+0x2b5/0x340 [ 26.916243] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.922349] [] ? sg_get_rq_mark+0x142/0x190 [ 26.928282] [] sg_read+0x8c2/0x1490 [ 26.933523] [] ? save_stack_trace+0x26/0x50 [ 26.939455] [] ? save_stack+0x43/0xd0 [ 26.944867] [] ? kasan_slab_free+0x72/0xc0 [ 26.950715] [] ? kmem_cache_free+0xc7/0x320 [ 26.956650] [] ? putname+0xee/0x130 [ 26.961890] [] ? compat_SyS_open+0x2a/0x40 [ 26.967741] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.974368] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 26.981181] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 26.988072] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.994706] [] __vfs_read+0x103/0x440 [ 27.000125] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.007018] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.012953] [] ? fsnotify+0x5ad/0xee0 [ 27.018364] [] ? fsnotify+0xee0/0xee0 [ 27.023797] [] ? avc_policy_seqno+0x9/0x20 [ 27.029644] [] ? selinux_file_permission+0x348/0x460 [ 27.036360] [] ? security_file_permission+0x89/0x1e0 [ 27.043077] [] ? rw_verify_area+0x100/0x2f0 [ 27.049010] [] vfs_read+0x123/0x3a0 [ 27.054249] [] SyS_read+0xd9/0x1b0 [ 27.059400] [] ? do_sendfile+0xd30/0xd30 [ 27.065073] [] ? vmacache_update+0xfe/0x130 [ 27.071009] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.077204] [] ? do_sendfile+0xd30/0xd30 [ 27.082879] [] do_fast_syscall_32+0x314/0x890 [ 27.088988] [] sysenter_flags_fixed+0xd/0x17 [ 27.095007] Code: 96 a4 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 [ 27.121253] RIP [] __free_pages+0x21/0x90 [ 27.127128] RSP [ 27.134643] ---[ end trace 08b70fd7e22d777a ]--- [ 27.139381] Kernel panic - not syncing: Fatal exception [ 27.145146] Dumping ftrace buffer: [ 27.148658] (ftrace buffer empty) [ 27.152334] Kernel Offset: disabled [ 27.155922] Rebooting in 86400 seconds..