================================================================== BUG: KCSAN: data-race in vfs_readlink / vfs_readlink write to 0xffff888015597502 of 2 bytes by task 31581 on cpu 1: vfs_readlink+0x20b/0x260 fs/namei.c:4552 do_readlinkat+0x170/0x200 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:434 [inline] __se_sys_readlinkat fs/stat.c:431 [inline] __x64_sys_readlinkat+0x4f/0x60 fs/stat.c:431 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888015597502 of 2 bytes by task 31577 on cpu 0: vfs_readlink+0x56/0x260 fs/namei.c:4544 do_readlinkat+0x170/0x200 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:434 [inline] __se_sys_readlinkat fs/stat.c:431 [inline] __x64_sys_readlinkat+0x4f/0x60 fs/stat.c:431 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: 31577 Comm: systemd-udevd Not tainted 5.11.0-rc7-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: 31577 Comm: systemd-udevd Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x116/0x15d lib/dump_stack.c:120 panic+0x1e7/0x5fa kernel/panic.c:231 kcsan_report+0x67b/0x680 kernel/kcsan/report.c:634 kcsan_setup_watchpoint+0x472/0x4d0 kernel/kcsan/core.c:568 vfs_readlink+0x56/0x260 fs/namei.c:4544 do_readlinkat+0x170/0x200 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:434 [inline] __se_sys_readlinkat fs/stat.c:431 [inline] __x64_sys_readlinkat+0x4f/0x60 fs/stat.c:431 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9d1e2020ba Code: 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 0b 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe51e76f08 EFLAGS: 00000206 ORIG_RAX: 000000000000010b RAX: ffffffffffffffda RBX: 000055abe1cb6ec0 RCX: 00007f9d1e2020ba RDX: 000055abe1cb6ec0 RSI: 00007ffe51e76f90 RDI: 00000000ffffff9c RBP: 0000000000000064 R08: 0000000000000000 R09: 0000000000000070 R10: 0000000000000063 R11: 0000000000000206 R12: 00007ffe51e76f90 R13: 00000000ffffff9c R14: 00007ffe51e76f60 R15: 0000000000000063 Kernel Offset: disabled Rebooting in 86400 seconds..