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 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: On Wed, Aug 28, 2024 at 12:42:43PM GMT, kernel test robot wrote: > > > Hello, > > kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: > > commit: 131e4ef350fae9d7bb5077330f4a7805d429d4b7 ("mm: change failure of MAP_FIXED to restoring the gap on failure") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > > [test failed on linux-next/master 6f923748057a4f6aa187e0d5b22990d633a48d12] > > in testcase: trinity > version: > with following parameters: > > runtime: 300s > group: group-03 > nr_groups: 5 > > > > compiler: gcc-12 > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > > +-------------------------------------------------------+------------+------------+ > | | 80cb1398c2 | 131e4ef350 | > +-------------------------------------------------------+------------+------------+ > | BUG:kernel_NULL_pointer_dereference,address | 0 | 12 | > | Oops:Oops:#[##] | 0 | 12 | > | EIP:mmap_region | 0 | 12 | > | Kernel_panic-not_syncing:Fatal_exception | 0 | 12 | > +-------------------------------------------------------+------------+------------+ > > This looks to be the already fixed [0] as the stack trace winds up in vms_abort_munmap_vmas() at precisely the line you'd expect. So this is already fixed! [0]:https://lore.kernel.org/all/20240827225835.857A6C4E674@smtp.kernel.org/ > 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/202408281008.b26bed01-lkp@intel.com > > > [ 36.945736][ T3519] BUG: kernel NULL pointer dereference, address: 00000000 > [ 36.947543][ T3519] #PF: supervisor read access in kernel mode > [ 36.948751][ T3519] #PF: error_code(0x0000) - not-present page > [ 36.950005][ T3519] *pde = 00000000 > [ 36.951050][ T3519] Oops: Oops: 0000 [#1] > [ 36.952388][ T3519] CPU: 0 UID: 0 PID: 3519 Comm: trinity-main Not tainted 6.11.0-rc4-00360-g131e4ef350fa #1 > [ 36.955401][ T3519] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > [ 36.958508][ T3519] EIP: mmap_region (mm/vma.h:90 mm/vma.h:187 mm/mmap.c:1625) > [ 36.959891][ T3519] Code: ff 8b 85 0c ff ff ff 85 c0 0f 85 17 01 00 00 8b 45 a8 85 c0 0f 84 8e fe ff ff 80 7d c1 00 0f 85 07 02 00 00 8b 9d 7c ff ff ff 00 00 00 00 83 7b 1c 01 74 0a 3b 43 04 72 49 39 43 08 72 44 8b > All code > ======== > 0: ff 8b 85 0c ff ff decl -0xf37b(%rbx) > 6: ff 85 c0 0f 85 17 incl 0x17850fc0(%rbp) > c: 01 00 add %eax,(%rax) > e: 00 8b 45 a8 85 c0 add %cl,-0x3f7a57bb(%rbx) > 14: 0f 84 8e fe ff ff je 0xfffffffffffffea8 > 1a: 80 7d c1 00 cmpb $0x0,-0x3f(%rbp) > 1e: 0f 85 07 02 00 00 jne 0x22b > 24: 8b 9d 7c ff ff ff mov -0x84(%rbp),%ebx > 2a:* a1 00 00 00 00 83 7b movabs 0x11c7b8300000000,%eax <-- trapping instruction > 31: 1c 01 > 33: 74 0a je 0x3f > 35: 3b 43 04 cmp 0x4(%rbx),%eax > 38: 72 49 jb 0x83 > 3a: 39 43 08 cmp %eax,0x8(%rbx) > 3d: 72 44 jb 0x83 > 3f: 8b .byte 0x8b > > Code starting with the faulting instruction > =========================================== > 0: a1 00 00 00 00 83 7b movabs 0x11c7b8300000000,%eax > 7: 1c 01 > 9: 74 0a je 0x15 > b: 3b 43 04 cmp 0x4(%rbx),%eax > e: 72 49 jb 0x59 > 10: 39 43 08 cmp %eax,0x8(%rbx) > 13: 72 44 jb 0x59 > 15: 8b .byte 0x8b > [ 36.965467][ T3519] EAX: 00000001 EBX: ec941df4 ECX: 0003d5a1 EDX: 0003d5a0 > [ 36.967583][ T3519] ESI: ecbf3090 EDI: ffffffed EBP: ec941ea0 ESP: ec941d94 > [ 36.969628][ T3519] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010246 > [ 36.972151][ T3519] CR0: 80050033 CR2: 00000000 CR3: 2c027000 CR4: 00040690 > [ 36.976717][ T3519] Call Trace: > [ 36.978114][ T3519] ? show_regs (arch/x86/kernel/dumpstack.c:479) > [ 36.979568][ T3519] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) > [ 36.980890][ T3519] ? debug_locks_off (lib/debug_locks.c:44) > [ 36.982519][ T3519] ? oops_enter (kernel/panic.c:624 kernel/panic.c:682) > [ 36.983919][ T3519] ? page_fault_oops (arch/x86/mm/fault.c:715) > [ 36.985598][ T3519] ? kernelmode_fixup_or_oops+0x68/0x7c > [ 36.987717][ T3519] ? __bad_area_nosemaphore+0x11d/0x1fc > [ 36.989674][ T3519] ? search_extable (lib/extable.c:118) > [ 36.991264][ T3519] ? search_module_extables (kernel/module/main.c:3277) > [ 36.992945][ T3519] ? mmap_region (mm/vma.h:90 mm/vma.h:187 mm/mmap.c:1625) > [ 36.994489][ T3519] ? search_exception_tables (kernel/extable.c:64) > [ 36.996215][ T3519] ? lock_mm_and_find_vma (mm/memory.c:5883 mm/memory.c:5938) > [ 36.997911][ T3519] ? bad_area_nosemaphore (arch/x86/mm/fault.c:835) > [ 36.999481][ T3519] ? do_user_addr_fault (arch/x86/mm/fault.c:1452) > [ 37.001030][ T3519] ? 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:1489 arch/x86/mm/fault.c:1539) > [ 37.002529][ T3519] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494) > [ 37.004196][ T3519] ? handle_exception (arch/x86/entry/entry_32.S:1047) > [ 37.005567][ T3519] ? alloc_pages_bulk_noprof (mm/page_alloc.c:4528) > [ 37.007193][ T3519] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494) > [ 37.008933][ T3519] ? mmap_region (mm/vma.h:90 mm/vma.h:187 mm/mmap.c:1625) This is: In mm/vma.h: static inline void vms_abort_munmap_vmas(struct vma_munmap_struct *vms, struct ma_state *mas_detach) { ... if (unlikely(vma_iter_store_gfp(vms->vmi, NULL, GFP_KERNEL))) { <--- here ... } In mm/mmap.c: unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, struct list_head *uf) { ... abort_munmap: vms_abort_munmap_vmas(&vms, &mas_detach); <---- here ... } > [ 37.010396][ T3519] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1494) > [ 37.012303][ T3519] ? mmap_region (mm/vma.h:90 mm/vma.h:187 mm/mmap.c:1625) > [ 37.013810][ T3519] ? mas_prev_slot (lib/maple_tree.c:760 lib/maple_tree.c:4553) > [ 37.015420][ T3519] do_mmap (mm/mmap.c:495) > [ 37.016772][ T3519] vm_mmap_pgoff (mm/util.c:588) > [ 37.018235][ T3519] ksys_mmap_pgoff (mm/mmap.c:541) > [ 37.019761][ T3519] __ia32_sys_mmap_pgoff (mm/mmap.c:548) > [ 37.021406][ T3519] ia32_sys_call (arch/x86/entry/syscall_32.c:44) > [ 37.022995][ T3519] __do_fast_syscall_32 (arch/x86/entry/common.c:165 arch/x86/entry/common.c:386) > [ 37.024620][ T3519] do_fast_syscall_32 (arch/x86/entry/common.c:411) > [ 37.026203][ T3519] do_SYSENTER_32 (arch/x86/entry/common.c:450) > [ 37.027715][ T3519] entry_SYSENTER_32 (arch/x86/entry/entry_32.S:836) > [ 37.029275][ T3519] EIP: 0xb7ff1579 > [ 37.030483][ T3519] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76 > All code > ======== > 0: b8 01 10 06 03 mov $0x3061001,%eax > 5: 74 b4 je 0xffffffffffffffbb > 7: 01 10 add %edx,(%rax) > 9: 07 (bad) > a: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi > e: 10 08 adc %cl,(%rax) > 10: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi > ... > 20: 00 51 52 add %dl,0x52(%rcx) > 23: 55 push %rbp > 24:* 89 e5 mov %esp,%ebp <-- trapping instruction > 26: 0f 34 sysenter > 28: cd 80 int $0x80 > 2a: 5d pop %rbp > 2b: 5a pop %rdx > 2c: 59 pop %rcx > 2d: c3 ret > 2e: 90 nop > 2f: 90 nop > 30: 90 nop > 31: 90 nop > 32: 8d 76 00 lea 0x0(%rsi),%esi > 35: 58 pop %rax > 36: b8 77 00 00 00 mov $0x77,%eax > 3b: cd 80 int $0x80 > 3d: 90 nop > 3e: 8d .byte 0x8d > 3f: 76 .byte 0x76 > > Code starting with the faulting instruction > =========================================== > 0: 5d pop %rbp > 1: 5a pop %rdx > 2: 59 pop %rcx > 3: c3 ret > 4: 90 nop > 5: 90 nop > 6: 90 nop > 7: 90 nop > 8: 8d 76 00 lea 0x0(%rsi),%esi > b: 58 pop %rax > c: b8 77 00 00 00 mov $0x77,%eax > 11: cd 80 int $0x80 > 13: 90 nop > 14: 8d .byte 0x8d > 15: 76 .byte 0x76 > > > The kernel config and materials to reproduce are available at: > https://download.01.org/0day-ci/archive/20240828/202408281008.b26bed01-lkp@intel.com > > > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki >