================================================================== BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync write to 0xffff888052161b00 of 8 bytes by task 13097 on cpu 1: fasync_remove_entry+0xba/0x120 fs/fcntl.c:882 fasync_helper+0xcf/0xdc fs/fcntl.c:981 perf_fasync+0x6c/0xa0 kernel/events/core.c:6002 __fput+0x46a/0x520 fs/file_table.c:277 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888052161b00 of 8 bytes by interrupt on cpu 0: kill_fasync+0x3f/0x180 fs/fcntl.c:1019 perf_event_wakeup+0x11f/0x160 kernel/events/core.c:6042 perf_pending_event+0x12d/0x170 kernel/events/core.c:6098 irq_work_run_list+0x136/0x190 kernel/irq_work.c:156 irq_work_run+0x48/0xa0 kernel/irq_work.c:172 smp_irq_work_interrupt+0x3f/0x100 arch/x86/kernel/irq_work.c:21 irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:860 find_inode_nowait+0xb3/0x160 fs/inode.c:1434 ext4_update_other_inodes_time fs/ext4/inode.c:4868 [inline] ext4_do_update_inode fs/ext4/inode.c:4994 [inline] ext4_mark_iloc_dirty+0x12a8/0x1580 fs/ext4/inode.c:5547 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:5740 ext4_dirty_inode+0xb1/0xe0 fs/ext4/inode.c:5771 __mark_inode_dirty+0x5d4/0x940 fs/fs-writeback.c:2258 mark_inode_dirty include/linux/fs.h:2172 [inline] generic_write_end+0x1b7/0x1f0 fs/buffer.c:2199 ext4_da_write_end+0x158/0x620 fs/ext4/inode.c:3091 generic_perform_write+0x1d3/0x320 mm/filemap.c:3320 ext4_buffered_write_iter+0x143/0x290 fs/ext4/file.c:252 ext4_file_write_iter+0xf4/0xd40 fs/ext4/file.c:547 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 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/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13099 Comm: syz-executor.0 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================