[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.588314] 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: [ 19.841379] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.215960] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.225261] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 21.347766] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.242' (ECDSA) to the list of known hosts. executing program [ 42.273287] kasan: CONFIG_KASAN_INLINE enabled [ 42.277702] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.290550] Dumping ftrace buffer: [ 42.294061] (ftrace buffer empty) [ 42.297744] Modules linked in: [ 42.301033] CPU: 0 PID: 3337 Comm: syzkaller924807 Not tainted 4.4.112-g5f6325b #28 [ 42.308794] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.318120] task: ffff8801d04dc740 task.stack: ffff8800b7ce8000 [ 42.324143] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 42.332391] RSP: 0018:ffff8800b7cef9f0 EFLAGS: 00010a07 [ 42.337810] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba72b [ 42.345050] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 42.352293] RBP: ffff8800b7cefa00 R08: 0000000000000001 R09: 0000000000000000 [ 42.359544] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 42.366786] R13: 0000000000000020 R14: ffff8801d0380000 R15: dffffc0000000000 [ 42.374026] FS: 0000000000c10880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 42.382224] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.388077] CR2: 0000000020ef0fe0 CR3: 00000000b4788000 CR4: 0000000000160670 [ 42.395319] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.402562] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.409800] Stack: [ 42.411916] 0000000000000000 ffff8801d0380158 ffff8800b7cefa60 ffffffff825ba751 [ 42.419896] ffff8801d0380170 ffffed003a07002b ffffed003a07002e ffff8801d0380168 [ 42.427884] dead4ead00000000 ffff8801d0380140 0000000000000000 0000000000000000 [ 42.435854] Call Trace: [ 42.438412] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 42.444875] [] sg_finish_rem_req+0x2b5/0x340 [ 42.450912] [] sg_new_read.isra.18+0x39/0x3c0 [ 42.457033] [] ? sg_get_rq_mark+0x142/0x190 [ 42.462973] [] sg_read+0x8c2/0x1490 [ 42.468224] [] ? __check_object_size+0x154/0x35b [ 42.474603] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.481239] [] ? fsnotify+0xee0/0xee0 [ 42.486665] [] ? avc_policy_seqno+0x9/0x20 [ 42.492521] [] do_loop_readv_writev+0x141/0x1e0 [ 42.498822] [] ? security_file_permission+0x89/0x1e0 [ 42.505547] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.512193] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 42.518833] [] do_readv_writev+0x5dd/0x6e0 [ 42.524688] [] ? vfs_write+0x530/0x530 [ 42.530199] [] ? handle_mm_fault+0xbf5/0x3190 [ 42.536316] [] ? _raw_spin_unlock+0x2c/0x50 [ 42.542263] [] ? handle_mm_fault+0x3f2/0x3190 [ 42.548380] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 42.555200] [] ? __fsnotify_parent+0xbc/0x340 [ 42.561323] [] ? avc_policy_seqno+0x9/0x20 [ 42.567179] [] vfs_readv+0x78/0xb0 [ 42.572338] [] SyS_readv+0xd9/0x240 [ 42.577674] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 42.584233] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 42.590792] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 42.597338] Code: 26 a6 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 [ 42.624271] RIP [] __free_pages+0x21/0x90 [ 42.630172] RSP [ 42.634061] ---[ end trace c9e46ad2956bd9f0 ]--- [ 42.638798] Kernel panic - not syncing: Fatal exception [ 42.644508] Dumping ftrace buffer: [ 42.648029] (ftrace buffer empty) [ 42.651713] Kernel Offset: disabled [ 42.655308] Rebooting in 86400 seconds..