diff options
| author | Geoffrey Thomas <geofft@ldpreload.com> | 2025-03-14 08:47:42 -0400 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2025-07-10 13:49:03 -0600 |
| commit | e4e839b2eeea5745c48ce47144c7842eb7cd455f (patch) | |
| tree | 625dcbd28f8e2d2bd4d6e657069f0386be9fbdad /linux-user/main.c | |
| parent | 91748d50c7ef4addcc9302160a4b8b3c63d5d024 (diff) | |
| download | focaccia-qemu-e4e839b2eeea5745c48ce47144c7842eb7cd455f.tar.gz focaccia-qemu-e4e839b2eeea5745c48ce47144c7842eb7cd455f.zip | |
linux-user: Hold the fd-trans lock across fork
If another thread is holding target_fd_trans_lock during a fork, then the lock becomes permanently locked in the child and the emulator deadlocks at the next interaction with the fd-trans table. As with other locks, acquire the lock in fork_start() and release it in fork_end(). Cc: qemu-stable@nongnu.org Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com> Fixes: c093364f4d91 "fd-trans: Fix race condition on reallocation of the translation table." Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2846 Buglink: https://github.com/astral-sh/uv/issues/6105 Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20250314124742.4965-1-geofft@ldpreload.com>
Diffstat (limited to 'linux-user/main.c')
| -rw-r--r-- | linux-user/main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/linux-user/main.c b/linux-user/main.c index a9142ee726..f4f2007439 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -149,12 +149,14 @@ void fork_start(void) cpu_list_lock(); qemu_plugin_user_prefork_lock(); gdbserver_fork_start(); + fd_trans_prefork(); } void fork_end(pid_t pid) { bool child = pid == 0; + fd_trans_postfork(); qemu_plugin_user_postfork(child); mmap_fork_end(child); if (child) { |