Greeting, FYI, we noticed the following commit (built with clang-14): commit: 9857a17f206ff374aea78bccfb687f145368be2e ("mm/gup: remove try_get_page(), call try_get_compound_head() directly") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: trinity version: trinity-i386-4d2343bd-1_20200320 with following parameters: number: 99999 group: group-01 test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ 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): +------------------------------------------+------------+------------+ | | 54d516b1d6 | 9857a17f20 | +------------------------------------------+------------+------------+ | boot_successes | 10 | 0 | | boot_failures | 0 | 12 | | kernel_BUG_at_include/linux/pagemap.h | 0 | 12 | | invalid_opcode:#[##] | 0 | 12 | | EIP:try_get_compound_head | 0 | 12 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 12 | +------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 143.907782][ T3260] ------------[ cut here ]------------ [ 143.908513][ T3260] kernel BUG at include/linux/pagemap.h:223! [ 143.909454][ T3260] invalid opcode: 0000 [#1] [ 143.909946][ T3260] CPU: 0 PID: 3260 Comm: trinity-c0 Not tainted 5.14.0-00040-g9857a17f206f #1 [ 143.911026][ T3260] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 143.912039][ T3260] EIP: try_get_compound_head+0xac/0xb0 [ 143.912663][ T3260] Code: ba 00 8c 6c ff ff 0f 0b ff ff 0f 0b c3 74 ce 89 c3 74 ce 89 00 00 31 c0 00 00 31 c0 c7 61 82 e8 c7 61 82 e8 0f 0b 0f 0b 0f 0 b <0f> 0b e5 53 57 56 e5 53 57 56 8b 59 1c 39 8b 59 1c 39 05 13 15 e5 [ 143.914798][ T3260] EAX: ef228640 EBX: 00000000 ECX: ef228640 EDX: 00000001 [ 143.915590][ T3260] ESI: 80000000 EDI: f5eb8600 EBP: f5f43f14 ESP: f5f43f08 [ 143.916323][ T3260] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010206 [ 143.917183][ T3260] CR0: 80050033 CR2: 00ffd7c0 CR3: 75e19000 CR4: 00040690 [ 143.917975][ T3260] DR0: 769ae000 DR1: 769af000 DR2: 00000000 DR3: 00000000 [ 143.918765][ T3260] DR6: ffff0ff0 DR7: 00070602 [ 143.919258][ T3260] Call Trace: [ 143.919656][ T3260] generic_pipe_buf_get+0xf/0x20 [ 143.920180][ T3260] do_tee+0x1e7/0x2f0 [ 143.920650][ T3260] __ia32_sys_tee+0x50/0xa0 [ 143.921133][ T3260] do_int80_syscall_32+0x3a/0x90 [ 143.921718][ T3260] ? irqentry_exit_to_user_mode+0x2a/0x30 [ 143.922430][ T3260] ? irqentry_exit+0x30/0x70 [ 143.922960][ T3260] ? common_interrupt+0x34/0x40 [ 143.923534][ T3260] entry_INT80_32+0x104/0x104 [ 143.924028][ T3260] EIP: 0x77f1ba02 [ 143.924486][ T3260] Code: 95 01 00 05 25 36 02 00 83 ec 14 8d 80 e8 99 ff ff 50 6a 02 e8 1f ff 00 00 c7 04 24 7f 00 00 00 e8 7e 87 01 00 66 90 90 cd 8 0 <c3> 8d b6 00 00 00 00 8d bc 27 00 00 00 00 8b 1c 24 c3 8d b6 00 00 [ 143.926860][ T3260] EAX: ffffffda EBX: 00000124 ECX: 00000127 EDX: 0000004b [ 143.927655][ T3260] ESI: 0000000e EDI: 49494949 EBP: fffffff9 ESP: 7f96af88 [ 143.928455][ T3260] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000212 [ 143.929261][ T3260] Modules linked in: [ 143.929768][ T3260] ---[ end trace 9b076b1117b0ac35 ]--- To reproduce: # build kernel cd linux cp config-5.14.0-00040-g9857a17f206f .config make HOSTCC=clang-14 CC=clang-14 ARCH=i386 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang