------------[ cut here ]------------
WARNING: CPU: 0 PID: 2047 at fs/attr.c:211 notify_change2+0xb0e/0xe00 fs/attr.c:211
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 2047 Comm: syz-executor520 Not tainted 4.9.141+ #72
 ffff8801cef8f4e8 ffffffff81b43209 ffffffff82a38ce0 00000000ffffffff
 ffffffff82ab1d00 0000000000000000 0000000000000009 ffff8801cef8f5a8
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b6c3 ffffffff813f6f66
Call Trace:
 [<ffffffff81b43209>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b43209>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff8156831e>] notify_change2+0xb0e/0xe00 fs/attr.c:211
 [<ffffffff81565a19>] __remove_privs fs/inode.c:1793 [inline]
 [<ffffffff81565a19>] file_remove_privs+0x279/0x480 fs/inode.c:1815
 [<ffffffff81412351>] __generic_file_write_iter+0x161/0x540 mm/filemap.c:2824
 [<ffffffff815cadb7>] blkdev_write_iter+0x1b7/0x370 fs/block_dev.c:1718
 [<ffffffff815071c7>] vfs_iter_write+0x2d7/0x450 fs/read_write.c:390
 [<ffffffff815ae4fb>] iter_file_splice_write+0x5fb/0xb30 fs/splice.c:768
 [<ffffffff815a9ab8>] do_splice_from fs/splice.c:870 [inline]
 [<ffffffff815a9ab8>] direct_splice_actor+0x128/0x190 fs/splice.c:1037
 [<ffffffff815ab6c1>] splice_direct_to_actor+0x2c1/0x7e0 fs/splice.c:992
 [<ffffffff815abd83>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff8150d780>] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393
 [<ffffffff8150f864>] SYSC_sendfile64 fs/read_write.c:1454 [inline]
 [<ffffffff8150f864>] SyS_sendfile64+0x144/0x160 fs/read_write.c:1440
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817c13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..