[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.430984] 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: [ 21.449626] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.897199] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.839155] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 23.026051] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.15.219' (ECDSA) to the list of known hosts. [ 28.405972] random: nonblocking pool is initialized executing program [ 28.516749] kasan: CONFIG_KASAN_INLINE enabled [ 28.521177] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.533989] Dumping ftrace buffer: [ 28.537492] (ftrace buffer empty) [ 28.541167] Modules linked in: [ 28.544437] CPU: 0 PID: 3323 Comm: syzkaller089923 Not tainted 4.4.111-gf851888 #23 [ 28.552196] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.561543] task: ffff8800b54e5f00 task.stack: ffff8801d56d8000 [ 28.567573] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.575805] RSP: 0018:ffff8801d56df9f0 EFLAGS: 00010a07 [ 28.581228] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 28.588463] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.595710] RBP: ffff8801d56dfa00 R08: 0000000000000001 R09: 0000000000000000 [ 28.602952] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.610196] R13: 0000000000000020 R14: ffff8801d0d5c200 R15: dffffc0000000000 [ 28.617432] FS: 000000000098a880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.625634] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.631479] CR2: 0000000020ef0fe0 CR3: 00000001d8dae000 CR4: 0000000000160670 [ 28.638723] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.645965] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.653199] Stack: [ 28.655313] 0000000000000000 ffff8801d0d5c358 ffff8801d56dfa60 ffffffff825b9ec1 [ 28.663267] ffff8801d0d5c370 ffffed003a1ab86b ffffed003a1ab86e ffff8801d0d5c368 [ 28.671215] dead4ead00000000 ffff8801d0d5c340 0000000000000000 0000000000000000 [ 28.679170] Call Trace: [ 28.681731] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.688195] [] sg_finish_rem_req+0x2b5/0x340 [ 28.694216] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.700324] [] ? sg_get_rq_mark+0x142/0x190 [ 28.706268] [] sg_read+0x8c2/0x1490 [ 28.711511] [] ? __check_object_size+0x154/0x35b [ 28.717878] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.724518] [] ? fsnotify+0xee0/0xee0 [ 28.729936] [] ? avc_policy_seqno+0x9/0x20 [ 28.735794] [] do_loop_readv_writev+0x141/0x1e0 [ 28.742076] [] ? security_file_permission+0x89/0x1e0 [ 28.748794] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.755426] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.762065] [] do_readv_writev+0x5dd/0x6e0 [ 28.767912] [] ? vfs_write+0x530/0x530 [ 28.773414] [] ? handle_mm_fault+0xbf5/0x3190 [ 28.779534] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.785469] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.791668] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.798479] [] ? __fsnotify_parent+0xbc/0x340 [ 28.804589] [] ? avc_policy_seqno+0x9/0x20 [ 28.810444] [] vfs_readv+0x78/0xb0 [ 28.815598] [] SyS_readv+0xd9/0x240 [ 28.820835] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.827387] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.833929] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.840468] 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 [ 28.866738] RIP [] __free_pages+0x21/0x90 [ 28.872621] RSP [ 28.880017] ---[ end trace 582a86c8a8eb1ab1 ]--- [ 28.884774] Kernel panic - not syncing: Fatal exception [ 28.890562] Dumping ftrace buffer: [ 28.894075] (ftrace buffer empty) [ 28.897753] Kernel Offset: disabled [ 28.901343] Rebooting in 86400 seconds..