hid-generic 0000:0000:0000.0006: unknown main item tag 0x0
hid-generic 0000:0000:0000.0006: unknown main item tag 0x0
hid-generic 0000:0000:0000.0006: unknown main item tag 0x0
hid-generic 0000:0000:0000.0006: hidraw0: <UNKNOWN> HID v0.00 Device [syz1] on syz1
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2462!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2140 Comm: kworker/u4:3 Not tainted 4.4.163+ #122
Workqueue: writeback wb_workfn (flush-8:0)
task: ffff8801d6b3af80 task.stack: ffff8801c2590000
RIP: 0010:[<ffffffff81640120>]  [<ffffffff81640120>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
RSP: 0018:ffff8801c2597330  EFLAGS: 00010293
RAX: ffff8801d6b3af80 RBX: ffffea0002415800 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81640120 RDI: ffffea0002415810
RBP: ffff8801c25974e8 R08: ffff8801d6b3b848 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 000000000000008f R14: dffffc0000000000 R15: ffff8801c2597630
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2fdc911db4 CR3: 0000000002e0a000 CR4: 00000000001606b0
Stack:
 1ffff100384b2e74 ffff8801c25973c0 ffff8801c2597638 ffff8801c2597640
 0000000081a38520 ffffffffffffffff ffff8800b8bc4398 000000010000000c
 0000000000001b98 ffff8801c2597400 ffff8801c2597648 ffffed00384b2ec7
Call Trace:
 [<ffffffff8164f37c>] ext4_writepages+0xd4c/0x2c20 fs/ext4/inode.c:2617
 [<ffffffff813d76ff>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2334
 [<ffffffff81520141>] __writeback_single_inode+0x101/0x1340 fs/fs-writeback.c:1285
 [<ffffffff8152182b>] writeback_sb_inodes+0x4ab/0xee0 fs/fs-writeback.c:1548
 [<ffffffff8152235b>] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1617
 [<ffffffff81522969>] wb_writeback+0x529/0xd00 fs/fs-writeback.c:1726
 [<ffffffff815255e6>] wb_check_old_data_flush fs/fs-writeback.c:1841 [inline]
 [<ffffffff815255e6>] wb_do_writeback fs/fs-writeback.c:1865 [inline]
 [<ffffffff815255e6>] wb_workfn+0x966/0x1010 fs/fs-writeback.c:1894
 [<ffffffff81122c94>] process_one_work+0x824/0x1730 kernel/workqueue.c:2064
 [<ffffffff81123c79>] worker_thread+0xd9/0x1060 kernel/workqueue.c:2196
 [<ffffffff811340d8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff827127c5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: 48 89 df e8 c3 44 d7 ff e9 32 ff ff ff e8 79 71 cc ff 48 89 df e8 51 5e d7 ff e9 fa fd ff ff e8 67 71 cc ff 0f 0b e8 60 71 cc ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 51 71 cc ff 8b 85 18 ff ff ff 
RIP  [<ffffffff81640120>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
 RSP <ffff8801c2597330>
---[ end trace 2b76bd33ed585ce1 ]---