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"WARNING:at_mm/mmu_gather.c:#tlb_finish_mmu" on: commit: 0e1ad0324aabb5aef3ef409de9a395cda7ee6098 ("mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: boot config: x86_64-randconfig-004-20251209 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (please refer to attached dmesg/kmsg for entire log/backtrace) +--------------------------------------------+------------+------------+ | | ef8ae3fc3a | 0e1ad0324a | +--------------------------------------------+------------+------------+ | WARNING:at_mm/mmu_gather.c:#tlb_finish_mmu | 0 | 12 | | RIP:tlb_finish_mmu | 0 | 12 | +--------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202512102246.ee3d6d07-lkp@intel.com [ 5.210750][ T44] ------------[ cut here ]------------ [ 5.211469][ T44] WARNING: CPU: 0 PID: 44 at mm/mmu_gather.c:475 tlb_finish_mmu (mm/mmu_gather.c:475) [ 5.212311][ T44] Modules linked in: [ 5.212737][ T44] CPU: 0 UID: 0 PID: 44 Comm: modprobe Tainted: G T 6.18.0-rc5-00395-g0e1ad0324aab #1 PREEMPT [ 5.214003][ T44] Tainted: [T]=RANDSTRUCT [ 5.214515][ T44] RIP: 0010:tlb_finish_mmu (mm/mmu_gather.c:475) [ 5.215083][ T44] Code: 66 89 47 20 e8 90 fb ff ff ff 86 dc 00 00 00 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 53 48 89 fb f6 47 21 10 74 04 90 <0f> 0b 90 48 8b 03 8b 80 dc 00 00 00 ff c8 7e 10 80 4b 20 01 48 89 All code ======== 0: 66 89 47 20 mov %ax,0x20(%rdi) 4: e8 90 fb ff ff call 0xfffffffffffffb99 9: ff 86 dc 00 00 00 incl 0xdc(%rsi) f: 5d pop %rbp 10: c3 ret 11: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 18: 00 19: 55 push %rbp 1a: 48 89 e5 mov %rsp,%rbp 1d: 41 54 push %r12 1f: 53 push %rbx 20: 48 89 fb mov %rdi,%rbx 23: f6 47 21 10 testb $0x10,0x21(%rdi) 27: 74 04 je 0x2d 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 48 8b 03 mov (%rbx),%rax 30: 8b 80 dc 00 00 00 mov 0xdc(%rax),%eax 36: ff c8 dec %eax 38: 7e 10 jle 0x4a 3a: 80 4b 20 01 orb $0x1,0x20(%rbx) 3e: 48 rex.W 3f: 89 .byte 0x89 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 90 nop 3: 48 8b 03 mov (%rbx),%rax 6: 8b 80 dc 00 00 00 mov 0xdc(%rax),%eax c: ff c8 dec %eax e: 7e 10 jle 0x20 10: 80 4b 20 01 orb $0x1,0x20(%rbx) 14: 48 rex.W 15: 89 .byte 0x89 [ 5.217110][ T44] RSP: 0000:ffff888103fc7c28 EFLAGS: 00010202 [ 5.217747][ T44] RAX: 0000000000000000 RBX: ffff888103fc7cc8 RCX: ffff888103fc7c68 [ 5.218585][ T44] RDX: ffff888102b85000 RSI: ffff888103fc7cc8 RDI: ffff888103fc7cc8 [ 5.219466][ T44] RBP: ffff888103fc7c38 R08: 00007fffffffe000 R09: 00007ffffffff000 [ 5.220295][ T44] R10: 0000000094692512 R11: ffff888101b54948 R12: 00007ffeaa1ad000 [ 5.221108][ T44] R13: 0000000000000000 R14: ffff888103f70a00 R15: ffff888102b85000 [ 5.221923][ T44] FS: 0000000000000000(0000) GS:0000000000000000(0000) knlGS:0000000000000000 [ 5.222854][ T44] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5.223545][ T44] CR2: ffff88883ffff000 CR3: 000000010172b000 CR4: 00000000000406b0 [ 5.224429][ T44] Call Trace: [ 5.224782][ T44] [ 5.225096][ T44] setup_arg_pages (fs/exec.c:674) [ 5.225621][ T44] load_elf_binary (fs/binfmt_elf.c:1028 (discriminator 1)) [ 5.226127][ T44] ? exec_binprm (fs/exec.c:1670 fs/exec.c:1702) [ 5.226612][ T44] ? __lock_release+0x4e/0x120 [ 5.227188][ T44] ? exec_binprm (fs/exec.c:1670 fs/exec.c:1702) [ 5.227678][ T44] ? __this_cpu_preempt_check (lib/smp_processor_id.c:65) [ 5.228270][ T44] exec_binprm (fs/exec.c:1672 fs/exec.c:1702) [ 5.228746][ T44] bprm_execve (fs/exec.c:1754) [ 5.229212][ T44] kernel_execve (fs/exec.c:1922) [ 5.229754][ T44] call_usermodehelper_exec_async (kernel/umh.c:109) [ 5.230368][ T44] ? umh_complete (kernel/umh.c:64) [ 5.230867][ T44] ret_from_fork (arch/x86/kernel/process.c:164) [ 5.231341][ T44] ? umh_complete (kernel/umh.c:64) [ 5.231813][ T44] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) [ 5.232321][ T44] [ 5.232643][ T44] irq event stamp: 469 [ 5.233065][ T44] hardirqs last enabled at (477): __up_console_sem (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:109 arch/x86/include/asm/irqflags.h:151 kernel/printk/printk.c:345) [ 5.234028][ T44] hardirqs last disabled at (484): __up_console_sem (kernel/printk/printk.c:343 (discriminator 3)) [ 5.235062][ T44] softirqs last enabled at (504): handle_softirqs (kernel/softirq.c:469 (discriminator 2) kernel/softirq.c:650 (discriminator 2)) [ 5.236041][ T44] softirqs last disabled at (493): __do_softirq (kernel/softirq.c:657) [ 5.236959][ T44] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251210/202512102246.ee3d6d07-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki