Re: [PATCH v2] arm64: Enable KCSAN
From: Marco Elver <elver@google.com>
Date: 2021-12-02 10:20:10
Also in:
lkml
On Thu, 2 Dec 2021 at 11:16, Marco Elver [off-list ref] wrote: [...]
quoted
Reported by Kernel Concurrency Sanitizer on: CPU: 7 PID: 2530 Comm: syz-executor.11 Not tainted 5.10.0+ #113 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.104/01/2014 ================================================================== BUG: KCSAN: data-race in rwsem_spin_on_owner+0xf4/0x180 race at unknown origin, with read to 0xffff9767d3becfac of 4 bytes by task 18119 on cpu 0: rwsem_spin_on_owner+0xf4/0x180 rwsem_optimistic_spin+0x48/0x480 rwsem_down_read_slowpath+0x4a0/0x670 down_read+0x69/0x190 process_vm_rw+0x41e/0x840 __x64_sys_process_vm_writev+0x76/0x90 do_syscall_64+0x37/0x50 entry_SYSCALL_64_after_hwframe+0x44/0xa9
[...]
I actually have a "fix" for the data race in rwsem_spin_on_owner, that also shows where the other racing access comes from... which reminds me: https://lkml.kernel.org/r/20211202101238.33546-1-elver@google.com
Reading be hard ... that patch is for mutex_spin_on_owner. But the other racing access is the same. Thanks, -- Marco _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel