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Hello, kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on: commit: 9cb4096680ee90fe6be1b22ff3961174fa8e3ee4 ("TESTING, HACK: sheaves for everyone") https://git.kernel.org/cgit/linux/kernel/git/vbabka/linux.git slub-percpu-sheaves-v1r0 in testcase: boot compiler: gcc-10 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +-------------------------------------------------------+------------+------------+ | | 7e57e2483a | 9cb4096680 | +-------------------------------------------------------+------------+------------+ | boot_successes | 6 | 0 | | boot_failures | 0 | 6 | | BUG:unable_to_handle_page_fault_for_address | 0 | 3 | | Oops | 0 | 6 | | EIP:refill_obj_stock | 0 | 6 | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 6 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 3 | +-------------------------------------------------------+------------+------------+ 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/202407141855.53dbebec-oliver.sang@intel.com [ 9.827171][ C0] BUG: unable to handle page fault for address: 6b6b6b6b [ 9.828805][ C0] #PF: supervisor read access in kernel mode [ 9.830174][ C0] #PF: error_code(0x0000) - not-present page [ 9.830821][ C0] *pde = 00000000 [ 9.830821][ C0] Oops: Oops: 0000 [#1] PREEMPT [ 9.830821][ C0] CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.10.0-rc1-00012-g9cb4096680ee #1 [ 9.830821][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 9.830821][ C0] EIP: refill_obj_stock (include/linux/percpu-refcount.h:174 include/linux/percpu-refcount.h:204 include/linux/percpu-refcount.h:222 include/linux/memcontrol.h:810 mm/memcontrol.c:3650) [ 9.830821][ C0] Code: ff 31 c9 31 d2 b8 d0 a8 92 c3 68 6c e5 24 c1 6a 00 6a 00 6a 02 e8 66 7e e7 ff e8 89 7d 2f 01 83 c4 10 85 c0 0f 85 ae 01 00 00 <8b> 03 a8 03 0f 85 f4 01 00 00 ff 00 e8 6d 7d 2f 01 85 c0 0f 85 75 All code ======== 0: ff 31 pushq (%rcx) 2: c9 leaveq 3: 31 d2 xor %edx,%edx 5: b8 d0 a8 92 c3 mov $0xc392a8d0,%eax a: 68 6c e5 24 c1 pushq $0xffffffffc124e56c f: 6a 00 pushq $0x0 11: 6a 00 pushq $0x0 13: 6a 02 pushq $0x2 15: e8 66 7e e7 ff callq 0xffffffffffe77e80 1a: e8 89 7d 2f 01 callq 0x12f7da8 1f: 83 c4 10 add $0x10,%esp 22: 85 c0 test %eax,%eax 24: 0f 85 ae 01 00 00 jne 0x1d8 2a:* 8b 03 mov (%rbx),%eax <-- trapping instruction 2c: a8 03 test $0x3,%al 2e: 0f 85 f4 01 00 00 jne 0x228 34: ff 00 incl (%rax) 36: e8 6d 7d 2f 01 callq 0x12f7da8 3b: 85 c0 test %eax,%eax 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: 75 .byte 0x75 Code starting with the faulting instruction =========================================== 0: 8b 03 mov (%rbx),%eax 2: a8 03 test $0x3,%al 4: 0f 85 f4 01 00 00 jne 0x1fe a: ff 00 incl (%rax) c: e8 6d 7d 2f 01 callq 0x12f7d7e 11: 85 c0 test %eax,%eax 13: 0f .byte 0xf 14: 85 .byte 0x85 15: 75 .byte 0x75 [ 9.830821][ C0] EAX: 00000001 EBX: 6b6b6b6b ECX: 00000001 EDX: 23d164d6 [ 9.830821][ C0] ESI: 000000c4 EDI: 00000000 EBP: c4bc1e54 ESP: c4bc1e3c [ 9.830821][ C0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010002 [ 9.830821][ C0] CR0: 80050033 CR2: 6b6b6b6b CR3: 2b0e7000 CR4: 000406d0 [ 9.830821][ C0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 9.830821][ C0] DR6: fffe0ff0 DR7: 00000400 [ 9.830821][ C0] Call Trace: [ 9.830821][ C0] ? show_regs (arch/x86/kernel/dumpstack.c:479) [ 9.830821][ C0] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 9.830821][ C0] ? page_fault_oops (arch/x86/mm/fault.c:715) [ 9.830821][ C0] ? kernelmode_fixup_or_oops+0x64/0x70 [ 9.830821][ C0] ? __bad_area_nosemaphore+0x10d/0x1a8 [ 9.830821][ C0] ? bad_area_nosemaphore (arch/x86/mm/fault.c:835) [ 9.830821][ C0] ? do_user_addr_fault (arch/x86/mm/fault.c:1452) [ 9.830821][ C0] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1489 arch/x86/mm/fault.c:1539) [ 9.830821][ C0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494) [ 9.830821][ C0] ? handle_exception (arch/x86/entry/entry_32.S:1047) [ 9.830821][ C0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494) [ 9.830821][ C0] ? refill_obj_stock (include/linux/percpu-refcount.h:174 include/linux/percpu-refcount.h:204 include/linux/percpu-refcount.h:222 include/linux/memcontrol.h:810 mm/memcontrol.c:3650) [ 9.830821][ C0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494) [ 9.830821][ C0] ? refill_obj_stock (include/linux/percpu-refcount.h:174 include/linux/percpu-refcount.h:204 include/linux/percpu-refcount.h:222 include/linux/memcontrol.h:810 mm/memcontrol.c:3650) [ 9.830821][ C0] __memcg_slab_free_hook (mm/slab.h:599 mm/memcontrol.c:3804) [ 9.830821][ C0] __rcu_free_sheaf_prepare (mm/slub.c:5049) [ 9.830821][ C0] rcu_free_sheaf (mm/slub.c:5072) [ 9.830821][ C0] rcu_do_batch+0x17b/0x588 [ 9.830821][ C0] rcu_core (kernel/rcu/tree.c:2812) [ 9.830821][ C0] rcu_core_si (kernel/rcu/tree.c:2828) [ 9.830821][ C0] handle_softirqs (include/linux/jump_label.h:207 include/linux/jump_label.h:207 include/trace/events/irq.h:142 kernel/softirq.c:555) [ 9.830821][ C0] run_ksoftirqd (kernel/softirq.c:411 kernel/softirq.c:929) [ 9.830821][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) [ 9.830821][ C0] kthread (kernel/kthread.c:389) [ 9.830821][ C0] ? sort_range (kernel/smpboot.c:107) [ 9.830821][ C0] ? kthread_park (kernel/kthread.c:342) [ 9.830821][ C0] ret_from_fork (arch/x86/kernel/process.c:153) [ 9.830821][ C0] ? kthread_park (kernel/kthread.c:342) [ 9.830821][ C0] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 9.830821][ C0] entry_INT80_32 (arch/x86/entry/entry_32.S:944) [ 9.830821][ C0] Modules linked in: [ 9.830821][ C0] CR2: 000000006b6b6b6b [ 9.830821][ C0] ---[ end trace 0000000000000000 ]--- [ 9.830821][ C0] EIP: refill_obj_stock (include/linux/percpu-refcount.h:174 include/linux/percpu-refcount.h:204 include/linux/percpu-refcount.h:222 include/linux/memcontrol.h:810 mm/memcontrol.c:3650) [ 9.830821][ C0] Code: ff 31 c9 31 d2 b8 d0 a8 92 c3 68 6c e5 24 c1 6a 00 6a 00 6a 02 e8 66 7e e7 ff e8 89 7d 2f 01 83 c4 10 85 c0 0f 85 ae 01 00 00 <8b> 03 a8 03 0f 85 f4 01 00 00 ff 00 e8 6d 7d 2f 01 85 c0 0f 85 75 All code ======== 0: ff 31 pushq (%rcx) 2: c9 leaveq 3: 31 d2 xor %edx,%edx 5: b8 d0 a8 92 c3 mov $0xc392a8d0,%eax a: 68 6c e5 24 c1 pushq $0xffffffffc124e56c f: 6a 00 pushq $0x0 11: 6a 00 pushq $0x0 13: 6a 02 pushq $0x2 15: e8 66 7e e7 ff callq 0xffffffffffe77e80 1a: e8 89 7d 2f 01 callq 0x12f7da8 1f: 83 c4 10 add $0x10,%esp 22: 85 c0 test %eax,%eax 24: 0f 85 ae 01 00 00 jne 0x1d8 2a:* 8b 03 mov (%rbx),%eax <-- trapping instruction 2c: a8 03 test $0x3,%al 2e: 0f 85 f4 01 00 00 jne 0x228 34: ff 00 incl (%rax) 36: e8 6d 7d 2f 01 callq 0x12f7da8 3b: 85 c0 test %eax,%eax 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: 75 .byte 0x75 Code starting with the faulting instruction =========================================== 0: 8b 03 mov (%rbx),%eax 2: a8 03 test $0x3,%al 4: 0f 85 f4 01 00 00 jne 0x1fe a: ff 00 incl (%rax) c: e8 6d 7d 2f 01 callq 0x12f7d7e 11: 85 c0 test %eax,%eax 13: 0f .byte 0xf 14: 85 .byte 0x85 15: 75 .byte 0x75 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240714/202407141855.53dbebec-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki