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chK8QA6oEWHZxNSHCNbK16JIlbymihdzI92I00l6iBEG8PtorYHH86tqVLk91P7WAYf1v+o3GVBtGuLu4DTNxpd4SARgrHwzKCFNhXKcyMqgmn7V1zHa6MP9dM8UKe8QFBNzaTPDwZJ08hHc2fxL8Op4ec4P/G2fNJiXdYNGG1FMNrmBCOGDrbcGxKcuWL7mxqpMgcwLraJN7rRzJOySVvRgcYKW9bb7T/4TIh/3+/pnUheINxI7BMWIw+p3oeHy9cErVC639IVxhqbaKvbIKp1tZwRWFJAkS4RkFFJNez7h+KXyxDoBG73yBtX78O+qv7JvgOb2Imn+Pc9vF6n5kpZTGeU3FLCtk4BNu2EFkzz6SHcjNTa13Xx1keaeEZ5LDan/bMSSkPbALE8tWHYNCJLqTYB9dFrA+uW8hav6JxYMyDNTO8CTqM/fl4YMNAK2KrWhm0BlvWMM6U6qkH02JyKj8/qR07BGlVhS4fMsYVa+64LooiXHQ0EG+zbA0gvIRQ/C9K4FQDakCLS3wOidVs6eOv2LXVzA9pFPAKp2a2Wfm0RTK3gMn8Q2Ugb90Wf9VEzPvLr5sYCl+vcED2VEc15HtaMpCW1oa5SVpgesZgvKg4ldOlODbpwdKfJGx7+JqNKqPsaZKDFCvpLk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: c19bb0829736a5c7abe1d1b70d013489d720bb54 ("slab: add opt-in caching layer of percpu sheaves") https://git.kernel.org/cgit/linux/kernel/git/vbabka/linux.git slub-percpu-sheaves-v3 in testcase: rcutorture version: with following parameters: runtime: 300s test: cpuhotplug torture_type: srcud config: i386-randconfig-005-20250321 compiler: gcc-12 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | d52c71b1f1 | c19bb08297 | +---------------------------------------------+------------+------------+ | boot_successes | 6 | 0 | | boot_failures | 0 | 6 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 6 | | Oops | 0 | 6 | | EIP:slub_cpu_dead | 0 | 6 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 6 | +---------------------------------------------+------------+------------+ 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/202503241413.afff5aa1-lkp@intel.com [ 100.813833][ T6] BUG: kernel NULL pointer dereference, address: 00000008 [ 100.814405][ T6] #PF: supervisor read access in kernel mode [ 100.814830][ T6] #PF: error_code(0x0000) - not-present page [ 100.815260][ T6] *pde = 00000000 [ 100.815526][ T6] Oops: Oops: 0000 [#1] SMP [ 100.815856][ T6] CPU: 0 UID: 0 PID: 6 Comm: kworker/0:0 Not tainted 6.14.0-rc1-00007-gc19bb0829736 #1 [ 100.816542][ T6] Workqueue: events work_for_cpu_fn [ 100.816933][ T6] EIP: slub_cpu_dead (mm/slub.c:2578 mm/slub.c:2625 mm/slub.c:3783) [ 100.817301][ T6] Code: 01 a1 2c 56 a2 43 3d 2c 56 a2 43 74 72 8d 70 b8 8d 76 00 8b 1e 83 7d f0 07 77 7a 8b 45 f0 8b 0c 85 e0 78 5f 43 01 cb 8b 7b 1c <8b> 57 08 85 d2 74 11 8d 4f 0c 89 f0 e8 c0 e3 ff ff c7 47 08 00 00 All code ======== 0: 01 a1 2c 56 a2 43 add %esp,0x43a2562c(%rcx) 6: 3d 2c 56 a2 43 cmp $0x43a2562c,%eax b: 74 72 je 0x7f d: 8d 70 b8 lea -0x48(%rax),%esi 10: 8d 76 00 lea 0x0(%rsi),%esi 13: 8b 1e mov (%rsi),%ebx 15: 83 7d f0 07 cmpl $0x7,-0x10(%rbp) 19: 77 7a ja 0x95 1b: 8b 45 f0 mov -0x10(%rbp),%eax 1e: 8b 0c 85 e0 78 5f 43 mov 0x435f78e0(,%rax,4),%ecx 25: 01 cb add %ecx,%ebx 27: 8b 7b 1c mov 0x1c(%rbx),%edi 2a:* 8b 57 08 mov 0x8(%rdi),%edx <-- trapping instruction 2d: 85 d2 test %edx,%edx 2f: 74 11 je 0x42 31: 8d 4f 0c lea 0xc(%rdi),%ecx 34: 89 f0 mov %esi,%eax 36: e8 c0 e3 ff ff call 0xffffffffffffe3fb 3b: c7 .byte 0xc7 3c: 47 08 00 rex.RXB or %r8b,(%r8) ... Code starting with the faulting instruction =========================================== 0: 8b 57 08 mov 0x8(%rdi),%edx 3: 85 d2 test %edx,%edx 5: 74 11 je 0x18 7: 8d 4f 0c lea 0xc(%rdi),%ecx a: 89 f0 mov %esi,%eax c: e8 c0 e3 ff ff call 0xffffffffffffe3d1 11: c7 .byte 0xc7 12: 47 08 00 rex.RXB or %r8b,(%r8) ... [ 100.819393][ T6] EAX: 00000001 EBX: a9148000 ECX: a9148000 EDX: 00000000 [ 100.819900][ T6] ESI: 40392e80 EDI: 00000000 EBP: 401cfe78 ESP: 401cfe68 [ 100.820414][ T6] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010286 [ 100.820969][ T6] CR0: 80050033 CR2: 00000008 CR3: 7c8e9000 CR4: 00040690 [ 100.821493][ T6] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 100.822008][ T6] DR6: fffe0ff0 DR7: 00000400 [ 100.822356][ T6] Call Trace: [ 100.822609][ T6] ? show_regs (arch/x86/kernel/dumpstack.c:478) [ 100.822935][ T6] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 100.823237][ T6] ? page_fault_oops (arch/x86/mm/fault.c:709) [ 100.823596][ T6] ? kernelmode_fixup_or_oops+0x58/0x70 [ 100.824081][ T6] ? __bad_area_nosemaphore+0x10f/0x1f0 [ 100.824560][ T6] ? hrtimer_interrupt (kernel/time/hrtimer.c:1877) [ 100.824934][ T6] ? bad_area_nosemaphore (arch/x86/mm/fault.c:834) [ 100.825309][ T6] ? do_user_addr_fault (arch/x86/mm/fault.c:1451) [ 100.825686][ T6] ? sysvec_call_function_single (arch/x86/kernel/apic/apic.c:1049) [ 100.826123][ T6] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:87 arch/x86/include/asm/irqflags.h:147 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) [ 100.826474][ T6] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1493) [ 100.826923][ T6] ? handle_exception (arch/x86/entry/entry_32.S:1055) [ 100.827294][ T6] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1493) [ 100.827737][ T6] ? slub_cpu_dead (mm/slub.c:2578 mm/slub.c:2625 mm/slub.c:3783) [ 100.828071][ T6] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1493) [ 100.828520][ T6] ? slub_cpu_dead (mm/slub.c:2578 mm/slub.c:2625 mm/slub.c:3783) [ 100.828861][ T6] ? cpuhp_invoke_callback (kernel/cpu.c:194) [ 100.829258][ T6] ? __wait_for_common (kernel/sched/completion.c:122) [ 100.829631][ T6] ? hrtimer_nanosleep_restart (kernel/time/sleep_timeout.c:62) [ 100.830069][ T6] ? kfree (mm/slub.c:3777) [ 100.830367][ T6] ? __cpuhp_invoke_callback_range (kernel/cpu.c:967) [ 100.830805][ T6] ? _cpu_down+0xf9/0x390 [ 100.831205][ T6] ? __cpu_down_maps_locked (kernel/cpu.c:1475) [ 100.831611][ T6] ? work_for_cpu_fn (kernel/workqueue.c:6731) [ 100.831966][ T6] ? process_one_work (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/jump_label.h:262 include/trace/events/workqueue.h:110 kernel/workqueue.c:3241) [ 100.832338][ T6] ? worker_thread (kernel/workqueue.c:3311 kernel/workqueue.c:3398) [ 100.832694][ T6] ? kthread (kernel/kthread.c:464) [ 100.833001][ T6] ? rescuer_thread (kernel/workqueue.c:3344) [ 100.833356][ T6] ? kthreads_online_cpu (kernel/kthread.c:413) [ 100.833733][ T6] ? ret_from_fork (arch/x86/kernel/process.c:154) [ 100.838377][ T6] ? kthreads_online_cpu (kernel/kthread.c:413) [ 100.838752][ T6] ? ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 100.839109][ T6] ? entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 100.839472][ T6] Modules linked in: rcutorture torture [ 100.839877][ T6] CR2: 0000000000000008 [ 100.840173][ T6] ---[ end trace 0000000000000000 ]--- [ 100.840547][ T6] EIP: slub_cpu_dead (mm/slub.c:2578 mm/slub.c:2625 mm/slub.c:3783) [ 100.840886][ T6] Code: 01 a1 2c 56 a2 43 3d 2c 56 a2 43 74 72 8d 70 b8 8d 76 00 8b 1e 83 7d f0 07 77 7a 8b 45 f0 8b 0c 85 e0 78 5f 43 01 cb 8b 7b 1c <8b> 57 08 85 d2 74 11 8d 4f 0c 89 f0 e8 c0 e3 ff ff c7 47 08 00 00 All code ======== 0: 01 a1 2c 56 a2 43 add %esp,0x43a2562c(%rcx) 6: 3d 2c 56 a2 43 cmp $0x43a2562c,%eax b: 74 72 je 0x7f d: 8d 70 b8 lea -0x48(%rax),%esi 10: 8d 76 00 lea 0x0(%rsi),%esi 13: 8b 1e mov (%rsi),%ebx 15: 83 7d f0 07 cmpl $0x7,-0x10(%rbp) 19: 77 7a ja 0x95 1b: 8b 45 f0 mov -0x10(%rbp),%eax 1e: 8b 0c 85 e0 78 5f 43 mov 0x435f78e0(,%rax,4),%ecx 25: 01 cb add %ecx,%ebx 27: 8b 7b 1c mov 0x1c(%rbx),%edi 2a:* 8b 57 08 mov 0x8(%rdi),%edx <-- trapping instruction 2d: 85 d2 test %edx,%edx 2f: 74 11 je 0x42 31: 8d 4f 0c lea 0xc(%rdi),%ecx 34: 89 f0 mov %esi,%eax 36: e8 c0 e3 ff ff call 0xffffffffffffe3fb 3b: c7 .byte 0xc7 3c: 47 08 00 rex.RXB or %r8b,(%r8) ... Code starting with the faulting instruction =========================================== 0: 8b 57 08 mov 0x8(%rdi),%edx 3: 85 d2 test %edx,%edx 5: 74 11 je 0x18 7: 8d 4f 0c lea 0xc(%rdi),%ecx a: 89 f0 mov %esi,%eax c: e8 c0 e3 ff ff call 0xffffffffffffe3d1 11: c7 .byte 0xc7 12: 47 08 00 rex.RXB or %r8b,(%r8) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250324/202503241413.afff5aa1-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki