KCSAN: data-race in fanotify_handle

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in fanotify_handle_event / fsnotify (2) fs				2	1570d	1610d	0/26	auto-closed as invalid on 2020/03/17 09:26

================================================================== BUG: KCSAN: data-race in fanotify_handle_event / fsnotify write to 0xffff8881136a9478 of 4 bytes by task 10140 on cpu 1: send_to_group fs/notify/fsnotify.c:206 [inline] fsnotify+0x41e/0x7d0 fs/notify/fsnotify.c:368 fsnotify_path include/linux/fsnotify.h:54 [inline] fsnotify_path include/linux/fsnotify.h:47 [inline] fsnotify_modify include/linux/fsnotify.h:256 [inline] do_iter_write fs/read_write.c:974 [inline] do_iter_write+0x218/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x4c0/0x7f0 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1020 splice_direct_to_actor+0x215/0x510 fs/splice.c:975 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881136a9478 of 4 bytes by task 10134 on cpu 0: fanotify_group_event_mask fs/notify/fanotify/fanotify.c:184 [inline] fanotify_handle_event+0x1f9/0x89f fs/notify/fanotify/fanotify.c:407 send_to_group fs/notify/fsnotify.c:230 [inline] fsnotify+0x556/0x7d0 fs/notify/fsnotify.c:368 fsnotify_path include/linux/fsnotify.h:54 [inline] fsnotify_path include/linux/fsnotify.h:47 [inline] fsnotify_modify include/linux/fsnotify.h:256 [inline] do_iter_write fs/read_write.c:974 [inline] do_iter_write+0x218/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x4c0/0x7f0 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1020 splice_direct_to_actor+0x215/0x510 fs/splice.c:975 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10134 Comm: syz-executor.2 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================

Crashes (7):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Manager
2019/11/07 03:24	https://github.com/google/ktsan.git kcsan	94c006602e13	d797d201	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/06 23:18	https://github.com/google/ktsan.git kcsan	94c006602e13	da505f84	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/06 03:59	https://github.com/google/ktsan.git kcsan	94c006602e13	bc2c6e45	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/05 00:23	https://github.com/google/ktsan.git kcsan	94c006602e13	76630fc9	.config	console log	report	ci2-upstream-kcsan-gce
2019/11/04 16:34	https://github.com/google/ktsan.git kcsan	94c006602e13	18e12644	.config	console log	report	ci2-upstream-kcsan-gce
2019/10/23 14:33	https://github.com/google/ktsan.git kcsan	05f2236801fe	b602d64b	.config	console log	report	ci2-upstream-kcsan-gce
2019/10/16 19:33	https://github.com/google/ktsan.git kcsan	a6311db074d9	8c88c9c1	.config	console log	report	ci2-upstream-kcsan-gce

Crashes (7):

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