syzbot

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WARNING: CPU: 1 PID: 9249 at fs/attr.c:211 notify_change2+0xae2/0xd90 fs/attr.c:211
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 9249 Comm: syz-executor215 Not tainted 4.9.181+ #8
 ffff8801ce64f430 ffffffff81b57e21 0000000000000000 ffffffff82a3a960
 00000000ffffffff 0000000000000001 0000000000000009 ffff8801ce64f510
 ffffffff813fd5da 0000000041b58ab3 ffffffff82e312d2 ffffffff813fd401
Call Trace:
 [<00000000dacc3b26>] __dump_stack lib/dump_stack.c:15 [inline]
 [<00000000dacc3b26>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000a5cd978b>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<00000000be9bfbe8>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<000000001d450968>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<00000000c23a338d>] notify_change2+0xae2/0xd90 fs/attr.c:211
 [<0000000056020958>] __remove_privs fs/inode.c:1793 [inline]
 [<0000000056020958>] file_remove_privs+0x285/0x4b0 fs/inode.c:1815
 [<00000000f2391f5c>] __generic_file_write_iter+0x157/0x530 mm/filemap.c:3010
 [<00000000a17e17b7>] blkdev_write_iter fs/block_dev.c:1726 [inline]
 [<00000000a17e17b7>] blkdev_write_iter+0x1bb/0x370 fs/block_dev.c:1706
 [<0000000081465518>] vfs_iter_write+0x2e2/0x580 fs/read_write.c:390
 [<000000006f6a9b7f>] iter_file_splice_write+0x5a9/0xb10 fs/splice.c:768
 [<00000000f77aa175>] do_splice_from fs/splice.c:870 [inline]
 [<00000000f77aa175>] direct_splice_actor+0x126/0x1a0 fs/splice.c:1037
 [<00000000d17970d8>] splice_direct_to_actor+0x2c8/0x820 fs/splice.c:992
 [<00000000d98c2154>] do_splice_direct+0x1a5/0x260 fs/splice.c:1080
 [<000000007cd1a557>] do_sendfile+0x503/0xc00 fs/read_write.c:1402
 [<00000000871f9bc7>] SYSC_sendfile64 fs/read_write.c:1463 [inline]
 [<00000000871f9bc7>] SyS_sendfile64+0x145/0x160 fs/read_write.c:1449
 [<0000000002014681>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<00000000ab4c13aa>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..