On Sat, Dec 31, 2022 at 11:26:25PM +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed kernel_BUG_at_include/linux/mm.h due to commit (built with gcc-11): > > commit: 0af8489b0216fa1dd83e264bef8063f2632633d7 ("mm, slub: remove percpu slabs with CONFIG_SLUB_TINY") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > [test failed on linux-next/master c76083fac3bae1a87ae3d005b5cb1cbc761e31d5] > > in testcase: rcutorture > version: > with following parameters: > > runtime: 300s > test: default > torture_type: tasks-tracing > > test-description: rcutorture is rcutorture kernel module load/unload test. > test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt > > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > If you fix the issue, kindly add following tag > | Reported-by: kernel test robot > | Link: https://lore.kernel.org/oe-lkp/202212312021.bc1efe86-oliver.sang@intel.com > > > > > To reproduce: > > # build kernel > cd linux > cp config-6.1.0-rc2-00014-g0af8489b0216 .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. I was unable to reproduce in the same way as described above because some files referenced in job-script couldn't be downloaded from download.01.org/0day :( So I just built rcutorture module as builtin and I got weird spinlock bug on commit: 0af8489b0216 ("mm, slub: remove percpu slabs with CONFIG_SLUB_TINY") full dmesg added as attachment [ 1387.564837][ T57] BUG: unable to handle page fault for address: c108f5f4 [ 1387.566649][ T57] #PF: supervisor write access in kernel mode [ 1387.567965][ T57] #PF: error_code(0x0003) - permissions violation [ 1387.569439][ T57] *pde = 010001e1 [ 1387.570276][ T57] Oops: 0003 [#1] SMP [ 1387.571149][ T57] CPU: 2 PID: 57 Comm: rcu_torture_rea Tainted: G S 6.1.0-rc2-00010-g0af8489b0216 #2130 63d19ac2b985fca570c354d8750f489755de37ed [ 1387.574673][ T57] EIP: kvm_kick_cpu+0x54/0x90 [ 1387.575802][ T57] Code: 2f c5 01 8b 04 9d e0 d4 4e c4 83 15 14 7b 2f c5 00 83 05 08 6d 2f c5 01 0f b7 0c 30 b8 05 00 00 00 83 15 0c 6d 2f c5 00 31 db <0f> 01 c1 83 05 10 6d 2f c5 01 8b 5d f8 8b 75 fc 83 15 14 6d 2f c5 [ 1387.580456][ T57] EAX: 00000005 EBX: 00000000 ECX: 00000003 EDX: c108f5a0 [ 1387.582071][ T57] ESI: c5153580 EDI: 00000046 EBP: c69cddf8 ESP: c69cddf0 [ 1387.583775][ T57] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010046 [ 1387.585643][ T57] CR0: 80050033 CR2: c108f5f4 CR3: 0776b000 CR4: 00350e90 [ 1387.587492][ T57] Call Trace: [ 1387.588365][ T57] __pv_queued_spin_unlock_slowpath+0x66/0x110 [ 1387.589898][ T57] __pv_queued_spin_unlock+0x4b/0x60 [ 1387.591040][ T57] __raw_callee_save___pv_queued_spin_unlock+0x9/0x10 [ 1387.592771][ T57] do_raw_spin_unlock+0x49/0xa0 [ 1387.593805][ T57] _raw_spin_unlock_irqrestore+0x53/0xd0 [ 1387.594927][ T57] swake_up_one+0x4f/0x70 [ 1387.595739][ T57] __rcu_report_exp_rnp+0x26b/0x470 [ 1387.596730][ T57] rcu_report_exp_cpu_mult+0x82/0x2f0 [ 1387.597770][ T57] rcu_qs+0xac/0x160 [ 1387.598503][ T57] rcu_note_context_switch+0x31/0x1e0 [ 1387.599460][ T57] __schedule+0xc5/0x770 [ 1387.600195][ T57] __cond_resched+0x7a/0x100 [ 1387.600996][ T57] stutter_wait+0x9e/0x2c0 [ 1387.601956][ T57] rcu_torture_reader+0x162/0x3e0 [ 1387.603048][ T57] ? rcu_torture_reader+0x3e0/0x3e0 [ 1387.604269][ T57] ? __kthread_parkme+0xab/0xf0 [ 1387.605420][ T57] kthread+0x167/0x1d0 [ 1387.606383][ T57] ? rcu_torture_read_exit_child+0xa0/0xa0 [ 1387.607516][ T57] ? kthread_exit+0x50/0x50 [ 1387.608517][ T57] ret_from_fork+0x19/0x24 [ 1387.609548][ T57] Modules linked in: [ 1387.610187][ T57] CR2: 00000000c108f5f4 [ 1387.610873][ T57] ---[ end trace 0000000000000000 ]--- [ 1387.611829][ T57] EIP: kvm_kick_cpu+0x54/0x90 [ 1387.612653][ T57] Code: 2f c5 01 8b 04 9d e0 d4 4e c4 83 15 14 7b 2f c5 00 83 05 08 6d 2f c5 01 0f b7 0c 30 b8 05 00 00 00 83 15 0c 6d 2f c5 00 31 db <0f> 01 c1 83 05 10 6d 2f c5 01 8b 5d f8 8b 75 fc 83 15 14 6d 2f c5 [ 1387.616715][ T57] EAX: 00000005 EBX: 00000000 ECX: 00000003 EDX: c108f5a0 [ 1387.618242][ T57] ESI: c5153580 EDI: 00000046 EBP: c69cddf8 ESP: c69cddf0 [ 1387.619912][ T57] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010046 [ 1387.621666][ T57] CR0: 80050033 CR2: c108f5f4 CR3: 0776b000 CR4: 00350e90 [ 1387.623128][ T57] Kernel panic - not syncing: Fatal exception [ 1389.285045][ T57] Shutting down cpus with NMI [ 1389.297949][ T57] Kernel Offset: disabled [ 1389.299174][ T57] ---[ end Kernel panic - not syncing: Fatal exception ]---