Greeting, FYI, we noticed the following commit (built with gcc-11): commit: 50f6f89519d037a6f1b7cc0f97fe817db2e8806c ("eventpoll: add support for min-wait") https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git io_uring-min_ts in testcase: boot on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): [ 85.803123][ T47] ------------[ cut here ]------------ [ 85.803548][ T47] WARNING: CPU: 0 PID: 47 at kernel/rcu/rcutorture.c:2556 rcu_torture_fwd_prog_cr+0x221/0x297 [ 85.804313][ T47] Modules linked in: ppdev bochs drm_vram_helper drm_ttm_helper ttm drm_kms_helper drm parport_pc input_leds led_class intel_agp serio_raw drm_panel_orientation_quirks intel_gtt agpgart backlight [ 85.805716][ T47] CPU: 0 PID: 47 Comm: rcu_torture_fwd Not tainted 6.0.0-rc1-00076-g50f6f89519d0 #1 23f529eda81d8a8412c39ccc6fb3cc0714229110 [ 85.806657][ T47] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014 [ 85.807415][ T47] EIP: rcu_torture_fwd_prog_cr+0x221/0x297 [ 85.807846][ T47] Code: d8 e8 8d c3 87 ff e8 fc 91 8e ff 83 c4 10 84 c0 75 75 a0 0e b4 93 c2 84 c0 75 6c e8 d3 f5 ff ff 84 c0 75 63 83 7d f0 63 7f 02 <0f> 0b 8b 55 ec a1 40 2d d0 c1 ff 75 e4 ff 75 e0 29 f0 01 fa 2b 73 [ 85.809290][ T47] EAX: 00000000 EBX: c2e6d800 ECX: 00000000 EDX: 00000000 [ 85.809811][ T47] ESI: ffffab2b EDI: 00001ee3 EBP: c45e9f68 ESP: c45e9f44 [ 85.810329][ T47] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010293 [ 85.810889][ T47] CR0: 80050033 CR2: b7ee7000 CR3: 2e346000 CR4: 000406f0 [ 85.811409][ T47] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 85.811928][ T47] DR6: fffe0ff0 DR7: 00000400 [ 85.812278][ T47] Call Trace: [ 85.812524][ T47] rcu_torture_fwd_prog+0x110/0x199 [ 85.812910][ T47] ? rcu_torture_fwd_prog_cbfree+0x5f/0x5f [ 85.813339][ T47] kthread+0xc8/0xcd [ 85.813633][ T47] ? rcu_torture_fwd_prog_cbfree+0x5f/0x5f [ 85.814061][ T47] ? kthread_complete_and_exit+0x16/0x16 [ 85.814475][ T47] ret_from_fork+0x1c/0x28 [ 85.814810][ T47] irq event stamp: 64075 [ 85.815122][ T47] hardirqs last enabled at (64085): [] __up_console_sem+0x3e/0x42 [ 85.815765][ T47] hardirqs last disabled at (64094): [] __up_console_sem+0x21/0x42 [ 85.816457][ T47] softirqs last enabled at (63940): [] __do_softirq+0x321/0x351 [ 85.817093][ T47] softirqs last disabled at (63923): [] call_on_stack+0x40/0x46 [ 85.817725][ T47] ---[ end trace 0000000000000000 ]--- ========================================================================================= tbox_group/testcase/rootfs/kconfig/compiler/sleep: vm-snb-i386/boot/quantal-i386-core-20190426.cgz/i386-randconfig-a004-20210930/gcc-11/300 commit: ac4857de9f496 ("eventpoll: move expires to epoll_wq") 50f6f89519d03 ("eventpoll: add support for min-wait") ac4857de9f496d3e 50f6f89519d037a6f1b7cc0f97f ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :6 100% 6:6 dmesg.EIP:rcu_torture_fwd_prog_cr :6 100% 6:6 dmesg.WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog_cr :6 100% 6:6 dmesg.boot_failures If you fix the issue, kindly add following tag Reported-by: kernel test robot To reproduce: # build kernel cd linux cp config-6.0.0-rc1-00076-g50f6f89519d0 .config make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 INSTALL_MOD_PATH= modules_install cd find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k -m modules.cgz job-script # job-script is attached in this email # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. -- 0-DAY CI Kernel Test Service https://01.org/lkp