Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 52edddc18d9541ad72912b32edd74baacc94d504 ("mm,hugetlb: remove mlock ulimit for SHM_HUGETLB") url: https://github.com/0day-ci/linux/commits/UPDATE-20211101-211012/zhangyiru... in testcase: trinity version: trinity-x86_64-eadc80ef-1_20211030 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 -cpu Icelake-Server -smp 4 -m 16G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +---------------------------------------------+------------+------------+ | | 5d6ab0bb40 | 52edddc18d | +---------------------------------------------+------------+------------+ | boot_failures | 0 | 14 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 14 | | Oops:#[##] | 0 | 14 | | RIP:hugetlb_file_setup | 0 | 14 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 14 | +---------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 34.994042][ T489] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 34.995701][ T489] #PF: supervisor write access in kernel mode [ 34.997024][ T489] #PF: error_code(0x0002) - not-present page [ 34.998633][ T489] PGD 0 P4D 0 [ 34.999390][ T489] Oops: 0002 [#1] SMP PTI [ 35.000296][ T489] CPU: 3 PID: 489 Comm: trinity Not tainted 5.15.0-rc4-00272-g52edddc18d95 #1 [ 35.005614][ T489] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 35.010568][ T489] RIP: 0010:hugetlb_file_setup (fs/hugetlbfs/inode.c:1467) [ 35.013084][ T489] Code: 44 89 ef e8 c0 78 c2 ff 85 c0 0f 85 79 ff ff ff 65 4c 8b 2c 25 00 6d 01 00 49 8b 85 50 0b 00 00 48 89 ef 48 8b b0 88 00 00 00 <48> 89 34 25 00 00 00 00 e8 91 72 e1 ff 85 c0 0f 84 4a ff ff ff 80 All code ======== 0: 44 89 ef mov %r13d,%edi 3: e8 c0 78 c2 ff callq 0xffffffffffc278c8 8: 85 c0 test %eax,%eax a: 0f 85 79 ff ff ff jne 0xffffffffffffff89 10: 65 4c 8b 2c 25 00 6d mov %gs:0x16d00,%r13 17: 01 00 19: 49 8b 85 50 0b 00 00 mov 0xb50(%r13),%rax 20: 48 89 ef mov %rbp,%rdi 23: 48 8b b0 88 00 00 00 mov 0x88(%rax),%rsi 2a:* 48 89 34 25 00 00 00 mov %rsi,0x0 <-- trapping instruction 31: 00 32: e8 91 72 e1 ff callq 0xffffffffffe172c8 37: 85 c0 test %eax,%eax 39: 0f 84 4a ff ff ff je 0xffffffffffffff89 3f: 80 .byte 0x80 Code starting with the faulting instruction =========================================== 0: 48 89 34 25 00 00 00 mov %rsi,0x0 7: 00 8: e8 91 72 e1 ff callq 0xffffffffffe1729e d: 85 c0 test %eax,%eax f: 0f 84 4a ff ff ff je 0xffffffffffffff5f 15: 80 .byte 0x80 [ 35.019745][ T489] RSP: 0018:ffffa3814090be08 EFLAGS: 00010246 [ 35.022324][ T489] RAX: ffff8fa32afcfc00 RBX: 0000000000000000 RCX: 0000000000000000 [ 35.025307][ T489] RDX: 0000000000000000 RSI: ffff8fa08e346a80 RDI: 0000000000200000 [ 35.028263][ T489] RBP: 0000000000200000 R08: 0000000000000000 R09: ffffffffbd050840 [ 35.031280][ T489] R10: 0000000000000000 R11: ffffa3814090be5f R12: ffffa3814090be53 [ 35.034266][ T489] R13: ffff8fa08e2f4f80 R14: ffffffffffffffed R15: ffff8fa32c71fa60 [ 35.037260][ T489] FS: 00007fbbcfe28740(0000) GS:ffff8fa32fd80000(0000) knlGS:0000000000000000 [ 35.040474][ T489] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.043137][ T489] CR2: 0000000000000000 CR3: 000000012b2b2003 CR4: 0000000000170ee0 [ 35.046127][ T489] Call Trace: [ 35.048169][ T489] newseg (ipc/shm.c:649) [ 35.050413][ T489] ipcget (ipc/util.c:346 ipc/util.c:677) [ 35.052608][ T489] __x64_sys_shmget (ipc/shm.c:738) [ 35.054812][ T489] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) [ 35.057080][ T489] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:113) [ 35.059767][ T489] RIP: 0033:0x7fbbcff473aa [ 35.062030][ T489] Code: 48 8b 15 e9 fa 0b 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 45 31 d2 b8 1d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 8b 15 b1 fa 0b 00 f7 All code ======== 0: 48 8b 15 e9 fa 0b 00 mov 0xbfae9(%rip),%rdx # 0xbfaf0 7: f7 d8 neg %eax 9: 64 89 02 mov %eax,%fs:(%rdx) c: b8 ff ff ff ff mov $0xffffffff,%eax 11: c3 retq 12: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 19: 00 00 00 1c: 0f 1f 40 00 nopl 0x0(%rax) 20: 45 31 d2 xor %r10d,%r10d 23: b8 1d 00 00 00 mov $0x1d,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 06 ja 0x38 32: c3 retq 33: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 38: 48 8b 15 b1 fa 0b 00 mov 0xbfab1(%rip),%rdx # 0xbfaf0 3f: f7 .byte 0xf7 Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 06 ja 0xe 8: c3 retq 9: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) e: 48 8b 15 b1 fa 0b 00 mov 0xbfab1(%rip),%rdx # 0xbfac6 15: f7 .byte 0xf7 [ 35.069068][ T489] RSP: 002b:00007ffefaf95d28 EFLAGS: 00000246 ORIG_RAX: 000000000000001d [ 35.072124][ T489] RAX: ffffffffffffffda RBX: 0000000054000fb0 RCX: 00007fbbcff473aa [ 35.075081][ T489] RDX: 0000000054000fb0 RSI: 0000000000001000 RDI: 0000000000000000 [ 35.078026][ T489] RBP: 00007ffefaf95d34 R08: 00007fbbd000722c R09: 00007fbbd0007240 [ 35.081029][ T489] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 35.084324][ T489] R13: 00007ffefaf95d48 R14: 0000000000008000 R15: 00005562b0ca1340 [ 35.087371][ T489] Modules linked in: ipmi_devintf ipmi_msghandler sr_mod cdrom sg ppdev intel_rapl_msr bochs ata_generic drm_vram_helper drm_ttm_helper intel_rapl_common ttm drm_kms_helper crct10dif_pclmul parport_pc crc32_pclmul syscopyarea crc32c_intel sysfillrect parport sysimgblt ghash_clmulni_intel fb_sys_fops joydev drm serio_raw ata_piix i2c_piix4 libata ip_tables [ 35.098592][ T489] CR2: 0000000000000000 [ 35.101006][ T489] ---[ end trace 0573caf1f1c4de1d ]--- [ 35.114090][ T489] RIP: 0010:hugetlb_file_setup (fs/hugetlbfs/inode.c:1467) [ 35.156471][ T489] Code: 44 89 ef e8 c0 78 c2 ff 85 c0 0f 85 79 ff ff ff 65 4c 8b 2c 25 00 6d 01 00 49 8b 85 50 0b 00 00 48 89 ef 48 8b b0 88 00 00 00 <48> 89 34 25 00 00 00 00 e8 91 72 e1 ff 85 c0 0f 84 4a ff ff ff 80 All code ======== 0: 44 89 ef mov %r13d,%edi 3: e8 c0 78 c2 ff callq 0xffffffffffc278c8 8: 85 c0 test %eax,%eax a: 0f 85 79 ff ff ff jne 0xffffffffffffff89 10: 65 4c 8b 2c 25 00 6d mov %gs:0x16d00,%r13 17: 01 00 19: 49 8b 85 50 0b 00 00 mov 0xb50(%r13),%rax 20: 48 89 ef mov %rbp,%rdi 23: 48 8b b0 88 00 00 00 mov 0x88(%rax),%rsi 2a:* 48 89 34 25 00 00 00 mov %rsi,0x0 <-- trapping instruction 31: 00 32: e8 91 72 e1 ff callq 0xffffffffffe172c8 37: 85 c0 test %eax,%eax 39: 0f 84 4a ff ff ff je 0xffffffffffffff89 3f: 80 .byte 0x80 Code starting with the faulting instruction =========================================== 0: 48 89 34 25 00 00 00 mov %rsi,0x0 7: 00 8: e8 91 72 e1 ff callq 0xffffffffffe1729e d: 85 c0 test %eax,%eax f: 0f 84 4a ff ff ff je 0xffffffffffffff5f 15: 80 .byte 0x80 To reproduce: # build kernel cd linux cp config-5.15.0-rc4-00272-g52edddc18d95 .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 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 # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang