[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.606685] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.013582] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 22.370145] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 23.111198] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) [ 23.281891] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 28.959776] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) executing program [ 29.061458] kasan: CONFIG_KASAN_INLINE enabled [ 29.066625] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.079441] Dumping ftrace buffer: [ 29.082949] (ftrace buffer empty) [ 29.086625] Modules linked in: [ 29.089900] CPU: 0 PID: 3324 Comm: syzkaller168408 Not tainted 4.4.107-g610c835 #4 [ 29.097577] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.106905] task: ffff8800b5175f00 task.stack: ffff8801d5360000 [ 29.112935] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.121164] RSP: 0018:ffff8801d5367a40 EFLAGS: 00010a07 [ 29.126584] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 29.133819] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.141054] RBP: ffff8801d5367a50 R08: 0000000000000001 R09: 0000000000000000 [ 29.148288] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.155610] R13: 0000000000000020 R14: ffff8801d0af0000 R15: dffffc0000000000 [ 29.162845] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008d4a840 [ 29.171037] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.176884] CR2: 0000000020001000 CR3: 00000001d20d1000 CR4: 00000000001406f0 [ 29.184128] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.191365] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.198608] Stack: [ 29.200737] 0000000000000000 ffff8801d0af0158 ffff8801d5367ab0 ffffffff825b8cf1 [ 29.208688] ffff8801d0af0170 ffffed003a15e02b ffffed003a15e02e ffff8801d0af0168 [ 29.216639] dead4ead00000000 ffff8801d0af0140 0000000000000000 0000000000000000 [ 29.224613] Call Trace: [ 29.227167] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.233623] [] sg_finish_rem_req+0x2b5/0x340 [ 29.239646] [] sg_new_read.isra.18+0x39/0x3c0 [ 29.245757] [] ? sg_get_rq_mark+0x142/0x190 [ 29.251693] [] sg_read+0x8c2/0x1490 [ 29.256936] [] ? save_stack_trace+0x26/0x50 [ 29.262881] [] ? save_stack+0x43/0xd0 [ 29.268302] [] ? kasan_slab_free+0x72/0xc0 [ 29.274153] [] ? kmem_cache_free+0xc7/0x320 [ 29.280088] [] ? putname+0xee/0x130 [ 29.285338] [] ? compat_SyS_open+0x2a/0x40 [ 29.291187] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.297825] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 29.304629] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 29.311520] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.318152] [] __vfs_read+0x103/0x440 [ 29.323565] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.330457] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.336401] [] ? fsnotify+0x5ad/0xee0 [ 29.341814] [] ? fsnotify+0xee0/0xee0 [ 29.347241] [] ? avc_policy_seqno+0x9/0x20 [ 29.353092] [] ? selinux_file_permission+0x348/0x460 [ 29.359818] [] ? security_file_permission+0x89/0x1e0 [ 29.366539] [] ? rw_verify_area+0x100/0x2f0 [ 29.372484] [] vfs_read+0x123/0x3a0 [ 29.377726] [] SyS_read+0xd9/0x1b0 [ 29.382882] [] ? do_sendfile+0xd30/0xd30 [ 29.388567] [] ? vmacache_update+0xfe/0x130 [ 29.394502] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.400707] [] ? do_sendfile+0xd30/0xd30 [ 29.406383] [] do_fast_syscall_32+0x314/0x890 [ 29.412493] [] sysenter_flags_fixed+0xd/0x17 [ 29.418513] 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 [ 29.444897] RIP [] __free_pages+0x21/0x90 [ 29.450779] RSP [ 29.455330] ---[ end trace b0e14ca38ad20539 ]--- [ 29.460086] Kernel panic - not syncing: Fatal exception [ 29.465884] Dumping ftrace buffer: [ 29.469395] (ftrace buffer empty) [ 29.473081] Kernel Offset: disabled [ 29.476680] Rebooting in 86400 seconds..