================================================================== BUG: KCSAN: data-race in dput / vfs_rmdir write to 0xffff88811e9c8240 of 4 bytes by task 20876 on cpu 1: dont_mount include/linux/dcache.h:354 [inline] vfs_rmdir+0x1a6/0x2a0 fs/namei.c:3718 do_rmdir+0x16e/0x300 fs/namei.c:3773 __do_sys_rmdir fs/namei.c:3791 [inline] __se_sys_rmdir fs/namei.c:3789 [inline] __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3789 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811e9c8240 of 4 bytes by task 20881 on cpu 0: fast_dput fs/dcache.c:746 [inline] dput+0x2f/0x420 fs/dcache.c:865 path_put fs/namei.c:496 [inline] do_unlinkat+0x37a/0x4d0 fs/namei.c:3911 __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: 20881 Comm: systemd-udevd Not tainted 5.9.0-rc2-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: 20881 Comm: systemd-udevd Not tainted 5.9.0-rc2-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 fast_dput fs/dcache.c:746 [inline] dput+0x2f/0x420 fs/dcache.c:865 path_put fs/namei.c:496 [inline] do_unlinkat+0x37a/0x4d0 fs/namei.c:3911 __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: 0033:0x7fe3d4de90e7 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:00007ffcedd19668 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007ffcedd19aa0 RCX: 00007fe3d4de90e7 RDX: 0000000000000000 RSI: 00000000000007ab RDI: 00007ffcedd1a2a0 RBP: 00007ffcedd1a2a0 R08: 000000000000c000 R09: 0000000000000000 R10: 00005572d5debe80 R11: 0000000000000246 R12: 00007ffcedd1abb0 R13: 00005572d5debe10 R14: 00005572d5de5030 R15: 000000000000000e Kernel Offset: disabled Rebooting in 86400 seconds..