KCSAN: data-race in __put_unused_fd / do

==================================================================
BUG: KCSAN: data-race in __put_unused_fd / do_select

write to 0xffff88806f8b4f00 of 8 bytes by task 1227 on cpu 1:
 instrument_write include/linux/instrumented.h:42 [inline]
 __clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:42 [inline]
 __clear_open_fd fs/file.c:249 [inline]
 __put_unused_fd+0x78/0x120 fs/file.c:557
 __close_fd+0xd5/0x140 fs/file.c:639
 __do_sys_close fs/open.c:1270 [inline]
 __se_sys_close fs/open.c:1268 [inline]
 __x64_sys_close+0x46/0xb0 fs/open.c:1268
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88806f8b4f00 of 8 bytes by task 1260 on cpu 0:
 max_select_fd fs/select.c:446 [inline]
 do_select+0x315/0x1020 fs/select.c:487
 core_sys_select+0x2c7/0x5f0 fs/select.c:677
 do_pselect.constprop.0+0x125/0x160 fs/select.c:759
 __do_sys_pselect6 fs/select.c:784 [inline]
 __se_sys_pselect6 fs/select.c:769 [inline]
 __x64_sys_pselect6+0x12a/0x160 fs/select.c:769
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1260 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 1260 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x11d/0x187 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0x1a kernel/kcsan/report.c:626
 kcsan_setup_watchpoint+0x3fb/0x440 kernel/kcsan/core.c:519
 max_select_fd fs/select.c:446 [inline]
 do_select+0x315/0x1020 fs/select.c:487
 core_sys_select+0x2c7/0x5f0 fs/select.c:677
 do_pselect.constprop.0+0x125/0x160 fs/select.c:759
 __do_sys_pselect6 fs/select.c:784 [inline]
 __se_sys_pselect6 fs/select.c:769 [inline]
 __x64_sys_pselect6+0x12a/0x160 fs/select.c:769
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fca0590bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: ffffffffffffffda RBX: 00000000004fa7c0 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000040
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000340 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000866 R14: 00000000004cb470 R15: 00007fca0590c6d4
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (23):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Manager
2020/05/27 11:53	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	9072c126	.config	console log	report	ci2-upstream-kcsan-gce
2020/05/17 12:22	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	37bccd4e	.config	console log	report	ci2-upstream-kcsan-gce
2020/05/12 08:17	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	a497a5b4	.config	console log	report	ci2-upstream-kcsan-gce
2020/05/11 05:00	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	8742a2b9	.config	console log	report	ci2-upstream-kcsan-gce
2020/05/04 06:34	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	58ae5e18	.config	console log	report	ci2-upstream-kcsan-gce
2020/05/01 07:39	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	3698959a	.config	console log	report	ci2-upstream-kcsan-gce
2020/04/30 07:39	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	2dd552a5	.config	console log	report	ci2-upstream-kcsan-gce
2020/04/27 12:08	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	0ce7569e	.config	console log	report	ci2-upstream-kcsan-gce
2020/04/18 09:26	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	435c6d53	.config	console log	report	ci2-upstream-kcsan-gce
2020/04/17 04:52	https://github.com/google/ktsan.git kcsan	7c3cd68e5d38	c743fcb3	.config	console log	report	ci2-upstream-kcsan-gce
2020/03/08 06:07	https://github.com/google/ktsan.git kcsan	941e0d917bbf	2e9971bb	.config	console log	report	ci2-upstream-kcsan-gce
2020/03/03 00:10	https://github.com/google/ktsan.git kcsan	766d004d1b85	4a4e0509	.config	console log	report	ci2-upstream-kcsan-gce
2020/02/28 15:38	https://github.com/google/ktsan.git kcsan	766d004d1b85	c88c7b75	.config	console log	report	ci2-upstream-kcsan-gce
2020/02/04 21:41	https://github.com/google/ktsan.git kcsan	245a43005292	93e5e335	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/30 03:26	https://github.com/google/ktsan.git kcsan	245a43005292	5ed23f9a	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/22 09:30	https://github.com/google/ktsan.git kcsan	245a43005292	8eda0b95	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/20 06:12	https://github.com/google/ktsan.git kcsan	245a43005292	0342f8c7	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/17 18:31	https://github.com/google/ktsan.git kcsan	245a43005292	3de7aabb	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/11 22:56	https://github.com/google/ktsan.git kcsan	245a43005292	4c04afaa	.config	console log	report	ci2-upstream-kcsan-gce
2020/01/09 22:49	https://github.com/google/ktsan.git kcsan	245a43005292	4de4e9f0	.config	console log	report	ci2-upstream-kcsan-gce
2019/12/24 21:04	https://github.com/google/ktsan.git kcsan	245a43005292	be5c2c81	.config	console log	report	ci2-upstream-kcsan-gce
2019/12/16 01:13	https://github.com/google/ktsan.git kcsan	245a43005292	eef6e580	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/16 09:56	https://github.com/google/ktsan.git kcsan	5863cc791e4c	cdac920b	.config	console log	report	ci2-upstream-kcsan-gce

Crashes (23):

Time

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