==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / iput

write to 0xffff888124bf1d08 of 8 bytes by task 5084 on cpu 1:
 __mark_inode_dirty+0x214/0x7f0 fs/fs-writeback.c:2290
 generic_update_time fs/inode.c:1762 [inline]
 update_time fs/inode.c:1775 [inline]
 touch_atime+0x157/0x1a0 fs/inode.c:1846
 do_readlinkat+0x15d/0x200 fs/stat.c:430
 __do_sys_readlink fs/stat.c:452 [inline]
 __se_sys_readlink fs/stat.c:449 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:449
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888124bf1d08 of 8 bytes by task 14743 on cpu 0:
 iput+0x2e/0x550 fs/inode.c:1668
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3902
 __do_sys_unlink fs/namei.c:3942 [inline]
 __se_sys_unlink fs/namei.c:3940 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14743 Comm: systemd-udevd Not tainted 5.9.0-rc8-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: 14743 Comm: systemd-udevd Not tainted 5.9.0-rc8-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+0x10f/0x19d lib/dump_stack.c:118
 panic+0x207/0x64a kernel/panic.c:231
 kcsan_report+0x684/0x690 kernel/kcsan/report.c:630
 kcsan_setup_watchpoint+0x41e/0x4a0 kernel/kcsan/core.c:540
 iput+0x2e/0x550 fs/inode.c:1668
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3902
 __do_sys_unlink fs/namei.c:3942 [inline]
 __se_sys_unlink fs/namei.c:3940 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f0e01df60e7
Code: f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 bd 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007fffedd2c768 EFLAGS: 00000293 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 000056428d48d370 RCX: 00007f0e01df60e7
RDX: 00007fffedd2c784 RSI: 000056428c4c27dc RDI: 00007fffedd2c770
RBP: 000000000000102c R08: 0000000000000001 R09: 0000000000000014
R10: 0000000000000064 R11: 0000000000000293 R12: 00007fffedd2c880
R13: 000056428d48d370 R14: 0000000000000003 R15: 000000000000000e
Kernel Offset: disabled
Rebooting in 86400 seconds..