CVE-2025-39829

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> trace/fgraph: Fix the warning caused by missing unregister notifier<br /> <br /> This warning was triggered during testing on v6.16:<br /> <br /> notifier callback ftrace_suspend_notifier_call already registered<br /> WARNING: CPU: 2 PID: 86 at kernel/notifier.c:23 notifier_chain_register+0x44/0xb0<br /> ...<br /> Call Trace:<br /> <br /> blocking_notifier_chain_register+0x34/0x60<br /> register_ftrace_graph+0x330/0x410<br /> ftrace_profile_write+0x1e9/0x340<br /> vfs_write+0xf8/0x420<br /> ? filp_flush+0x8a/0xa0<br /> ? filp_close+0x1f/0x30<br /> ? do_dup2+0xaf/0x160<br /> ksys_write+0x65/0xe0<br /> do_syscall_64+0xa4/0x260<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> When writing to the function_profile_enabled interface, the notifier was<br /> not unregistered after start_graph_tracing failed, causing a warning the<br /> next time function_profile_enabled was written.<br /> <br /> Fixed by adding unregister_pm_notifier in the exception path.