Re: [LKP] [lkp-robot] [PM / QOS] 9820795796: kernel_BUG_at_mm/slab.c

FYI, we noticed the following commit: commit: 9820795796278bc66baa3f41220f8524cbdda537 ("PM / QOS: Add 'performance' request") https://git.linaro.org/people/vireshk/linux opp/genpd-performance-state in testcase: trinity with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-x86_64 -enable-kvm -m 512M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +------------------------------------------+------------+------------+ | | 65e83681e6 | 9820795796 | +------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 6 | 6 | | Kernel_panic-not_syncing:Fatal_exception | 6 | 6 | | kernel_BUG_at_mm/slab.c | 0 | 6 | +------------------------------------------+------------+------------+ [ 13.961126] kernel BUG at mm/slab.c:2815! [ 13.962800] invalid opcode: 0000 [#1] [ 13.963966] CPU: 0 PID: 1 Comm: swapper Not tainted 4.10.0-rc7-00115-g9820795 #1 [ 13.966194] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 13.969050] task: ffff88001f464040 task.stack: ffff88001f468000 [ 13.970725] RIP: 0010:___cache_free+0x157/0x2c9 [ 13.972083] RSP: 0000:ffff88001f46b640 EFLAGS: 00010002 [ 13.973598] RAX: 0000000000000400 RBX: ffff88001f400600 RCX: 0000000000000008 [ 13.975512] RDX: 000000000000024c RSI: ffff88001c37f000 RDI: ffff88001f400600 [ 13.977434] RBP: ffff88001f46b688 R08: ffff88001c37f400 R09: c1cff5f04a80d1ea [ 13.979343] R10: 0000000000000000 R11: ffff88001f4647d8 R12: ffff88001c37f498 [ 13.981276] R13: ffff88001ffd2608 R14: ffff88001c366bb0 R15: ffff88001c37f000 [ 13.983208] FS: 0000000000000000(0000) GS:ffffffff8203b000(0000) knlGS:0000000000000000 [ 13.985600] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 13.987236] CR2: 0000000000000000 CR3: 0000000002017000 CR4: 00000000000006f0 [ 13.989170] Call Trace: [ 13.990090] ? dev_pm_qos_constraints_destroy+0x19d/0x1c8 [ 13.991656] ? debug_check_no_locks_freed+0x114/0x147 [ 13.993132] kfree+0x53/0x7d [ 13.994140] dev_pm_qos_constraints_destroy+0x19d/0x1c8