[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.152678] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.653811] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.924841] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.734856] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 22.902534] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 28.274591] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) executing program [ 28.371865] sg_write: data in/out 30202/1 bytes for SCSI command 0x2c-- guessing data in; [ 28.371865] program syzkaller200437 not setting count and/or reply_len properly [ 28.389637] kasan: CONFIG_KASAN_INLINE enabled [ 28.394055] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.406889] Dumping ftrace buffer: [ 28.410393] (ftrace buffer empty) [ 28.414072] Modules linked in: [ 28.417345] CPU: 1 PID: 3311 Comm: syzkaller200437 Not tainted 4.4.110-gdac1439 #13 [ 28.425102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.434428] task: ffff8801d20b0000 task.stack: ffff8800b4558000 [ 28.440454] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.448681] RSP: 0018:ffff8800b455f970 EFLAGS: 00010a07 [ 28.454095] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 28.461330] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.468566] RBP: ffff8800b455f980 R08: 0000000000000001 R09: 0000000000000001 [ 28.475801] R10: 0000000000000000 R11: 1ffff100168abf0c R12: 0000000000000004 [ 28.483035] R13: 0000000000000020 R14: ffff8800b4554200 R15: dffffc0000000000 [ 28.490273] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000093bc840 [ 28.498477] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.504324] CR2: 0000000020aaaf6b CR3: 00000000b61fe000 CR4: 0000000000160670 [ 28.511560] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.518795] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.526026] Stack: [ 28.528142] ffffffff837761e9 ffff8800b4554358 ffff8800b455f9e0 ffffffff825b9c81 [ 28.536090] ffff8800b4554370 ffffed00168aa86b ffffed00168aa86e ffff8800b4554368 [ 28.544036] dead4ead00000000 ffff8800b4554340 0000000000000000 0000000000000000 [ 28.551982] Call Trace: [ 28.554548] [] ? retint_kernel+0x2d/0x2d [ 28.560234] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.566699] [] sg_finish_rem_req+0x2b5/0x340 [ 28.572722] [] sg_new_read.isra.18+0x336/0x3c0 [ 28.578918] [] sg_read+0x8c2/0x1490 [ 28.584160] [] ? sg_ioctl+0x2c20/0x2c20 [ 28.589750] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.596389] [] ? fsnotify+0xee0/0xee0 [ 28.601813] [] ? avc_policy_seqno+0x9/0x20 [ 28.607664] [] do_loop_readv_writev+0x141/0x1e0 [ 28.613947] [] ? security_file_permission+0x89/0x1e0 [ 28.620665] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.627297] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.633936] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.640392] [] ? vfs_writev+0xb0/0xb0 [ 28.645808] [] ? __vfs_write+0x10b/0x450 [ 28.651496] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.657435] [] ? __fsnotify_parent+0xbc/0x340 [ 28.663544] [] ? avc_policy_seqno+0x9/0x20 [ 28.669392] [] ? fsnotify+0x5ad/0xee0 [ 28.674806] [] ? fsnotify+0xee0/0xee0 [ 28.680221] [] ? rw_verify_area+0x100/0x2f0 [ 28.686158] [] compat_readv+0xd9/0x140 [ 28.691660] [] compat_SyS_readv+0xd8/0x1b0 [ 28.697516] [] ? SyS_pwritev+0x230/0x230 [ 28.703193] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.709388] [] ? SyS_pwritev+0x230/0x230 [ 28.715063] [] do_fast_syscall_32+0x314/0x890 [ 28.721175] [] sysenter_flags_fixed+0xd/0x17 [ 28.727197] 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 [ 28.753545] RIP [] __free_pages+0x21/0x90 [ 28.759430] RSP [ 28.763110] ---[ end trace 81cda997847caa53 ]--- [ 28.767850] Kernel panic - not syncing: Fatal exception [ 28.774183] Dumping ftrace buffer: [ 28.777708] (ftrace buffer empty) [ 28.781385] Kernel Offset: disabled [ 28.784978] Rebooting in 86400 seconds..