================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf8009bdbdd0 by task syz-executor.1/2032 CPU: 0 PID: 2032 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 [] check_prev_add kernel/locking/lockdep.c:3063 [inline] [] check_prevs_add kernel/locking/lockdep.c:3186 [inline] [] validate_chain kernel/locking/lockdep.c:3801 [inline] [] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027 Allocated by task 2516: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x8e/0x98 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x338/0x3de mm/slub.c:3243 ptlock_alloc mm/memory.c:5467 [inline] ptlock_init include/linux/mm.h:2293 [inline] pgtable_pte_page_ctor include/linux/mm.h:2320 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one include/asm-generic/pgalloc.h:85 [inline] __pte_alloc+0xe0/0x394 mm/memory.c:465 do_anonymous_page mm/memory.c:3747 [inline] handle_pte_fault mm/memory.c:4568 [inline] __handle_mm_fault+0x1bc8/0x23a4 mm/memory.c:4705 handle_mm_fault+0x296/0x674 mm/memory.c:4803 faultin_page mm/gup.c:944 [inline] __get_user_pages+0x444/0x7b4 mm/gup.c:1165 __get_user_pages_locked mm/gup.c:1350 [inline] __get_user_pages_remote+0x156/0x63a mm/gup.c:1996 get_user_pages_remote+0x5e/0x86 mm/gup.c:2069 get_arg_page+0xf4/0x282 fs/exec.c:222 copy_string_kernel+0x13c/0x3ea fs/exec.c:634 kernel_execve+0x16c/0x288 fs/exec.c:1967 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 The buggy address belongs to the object at ffffaf8009bdbd80 which belongs to the cache page->ptl of size 64 The buggy address is located 16 bytes to the right of 64-byte region [ffffaf8009bdbd80, ffffaf8009bdbdc0) The buggy address belongs to the page: page:ffffaf807a906598 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x89ddb flags: 0x8800000200(slab|section=17|node=0|zone=0) raw: 0000008800000200 0000000000000000 0000000000000122 ffffaf800720d640 raw: 0000000000000000 00000000002a002a 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 2479, ts 797178038100, free_ts 796963729500 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x76/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x39c/0x3de mm/slub.c:3243 ptlock_alloc mm/memory.c:5467 [inline] ptlock_init include/linux/mm.h:2293 [inline] pgtable_pte_page_ctor include/linux/mm.h:2320 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one include/asm-generic/pgalloc.h:85 [inline] __pte_alloc+0xe0/0x394 mm/memory.c:465 do_anonymous_page mm/memory.c:3747 [inline] handle_pte_fault mm/memory.c:4568 [inline] __handle_mm_fault+0x1bc8/0x23a4 mm/memory.c:4705 handle_mm_fault+0x296/0x674 mm/memory.c:4803 faultin_page mm/gup.c:944 [inline] __get_user_pages+0x444/0x7b4 mm/gup.c:1165 __get_user_pages_locked mm/gup.c:1350 [inline] __get_user_pages_remote+0x156/0x63a mm/gup.c:1996 get_user_pages_remote+0x5e/0x86 mm/gup.c:2069 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 free_pages.part.0+0xe0/0xf6 mm/page_alloc.c:5485 free_pages+0xe/0x18 mm/page_alloc.c:5482 pmd_free include/asm-generic/pgalloc.h:142 [inline] free_pmd_range mm/memory.c:266 [inline] free_pud_range mm/memory.c:284 [inline] free_p4d_range mm/memory.c:318 [inline] free_pgd_range+0x8b0/0xc54 mm/memory.c:398 free_pgtables+0xf2/0x1c8 mm/memory.c:430 exit_mmap+0x168/0x412 mm/mmap.c:3179 __mmput kernel/fork.c:1114 [inline] mmput+0xee/0x2c2 kernel/fork.c:1135 free_bprm+0xbc/0x1de fs/exec.c:1485 kernel_execve+0x214/0x288 fs/exec.c:1982 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 Memory state around the buggy address: ffffaf8009bdbc80: f1 f1 f1 f1 00 f3 f3 f3 fa fb fb fb fb fb fb fb ffffaf8009bdbd00: fc fc fc fc fa fb fb fb fb fb fb fb 00 00 00 00 >ffffaf8009bdbd80: f1 f1 f1 f1 00 f2 f2 f2 fc fc fc fc 00 00 00 f3 ^ ffffaf8009bdbe00: f3 f3 f3 f3 fc fc fc fc fa fb fb fb fb fb fb fb ffffaf8009bdbe80: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ==================================================================