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================================================================== BUG: KCSAN: data-race in mnt_want_write / umount_tree write to 0xffff8881335e5e30 of 4 bytes by task 2049 on cpu 0: umount_tree+0x89/0x8f0 fs/namespace.c:1509 dissolve_on_fput+0xaf/0x200 fs/namespace.c:1922 __fput+0x4b1/0x4e0 fs/file_table.c:295 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881335e5e30 of 4 bytes by task 2067 on cpu 1: __mnt_is_readonly fs/namespace.c:269 [inline] mnt_is_readonly fs/namespace.c:313 [inline] __mnt_want_write fs/namespace.c:353 [inline] mnt_want_write+0x117/0x220 fs/namespace.c:376 filename_create+0x92/0x3c0 fs/namei.c:3587 user_path_create fs/namei.c:3650 [inline] do_mknodat+0xbf/0x320 fs/namei.c:3731 __do_sys_mknodat fs/namei.c:3770 [inline] __se_sys_mknodat fs/namei.c:3767 [inline] __x64_sys_mknodat+0x4e/0x60 fs/namei.c:3767 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2067 Comm: syz-executor.0 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2021/05/06 21:06 | upstream | 8404c9fbc84b | 06585184 | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in mnt_want_write / umount_tree |