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This results in a use-after-free >> failure during module unloading if invoking idxd_free() immediately >> afterward. >> > >I think that adding the relevant part of the log would be helpful. (I am >looking at either a similar, or this exact problem, so at least to me it >would be helpful) > The issue is easily reproducible: unloading the module with 'modprobe -r idxd' can trigger the call trace so long as a idxd_free() is called immediately after the put_device(). I can include the call trace in the next version commit log if it's helpful. [ 1957.463315] refcount_t: underflow; use-after-free. [ 1957.463337] WARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 ... ... [ 1957.463424] RIP: 0010:refcount_warn_saturate+0xbe/0x110 ... ... [ 1957.463445] Call Trace: [ 1957.463450] [ 1957.463458] idxd_remove+0xe4/0x120 [idxd] [ 1957.463497] pci_device_remove+0x3f/0xb0 [ 1957.463505] device_release_driver_internal+0x197/0x200 [ 1957.463513] driver_detach+0x48/0x90 [ 1957.463515] bus_remove_driver+0x74/0xf0 [ 1957.463521] pci_unregister_driver+0x2e/0xb0 [ 1957.463524] idxd_exit_module+0x34/0x7a0 [idxd] [ 1957.463529] __do_sys_delete_module.constprop.0+0x183/0x280 [ 1957.463536] ? syscall_trace_enter+0x163/0x1c0 [ 1957.463540] do_syscall_64+0x54/0xd70 [ 1957.463549] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 1957.463555] RIP: 0033:0x7fb52b10ee2b >> Removes the improper call idxd_free() to prevent potential memory >> corruption. > >Thinking if it would be worth a Fixes: tag. > Yes, sure. Will add Fixes: tag next version. Thanks --Sun, Yi