================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf800ee87b70 by task syz-executor.1/2059 CPU: 0 PID: 2059 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 [] lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 [] lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 [] __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] [] _raw_spin_lock+0x32/0x48 kernel/locking/spinlock.c:154 [] spin_lock include/linux/spinlock.h:349 [inline] [] rmqueue_bulk+0xae/0x5e8 mm/page_alloc.c:3033 Allocated by task 1: 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_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] kmem_cache_alloc_trace+0x178/0x2e0 mm/slub.c:3257 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] usb_serial_register_drivers+0x56/0x924 drivers/usb/serial/usb-serial.c:1491 usb_serial_module_init+0x30/0x38 drivers/usb/serial/aircable.c:157 do_one_initcall+0x13a/0x7ea init/main.c:1300 do_initcall_level init/main.c:1373 [inline] do_initcalls init/main.c:1389 [inline] do_basic_setup init/main.c:1408 [inline] kernel_init_freeable+0x510/0x5b4 init/main.c:1613 kernel_init+0x28/0x21c init/main.c:1502 ret_from_exception+0x0/0x10 The buggy address belongs to the object at ffffaf800ee87800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 368 bytes to the right of 512-byte region [ffffaf800ee87800, ffffaf800ee87a00) The buggy address belongs to the page: page:ffffaf807aa7a520 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8f084 head:ffffaf807aa7a520 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000000 0000000000000001 ffffaf8007201c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1149, ts 61307429600, free_ts 61298961500 __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+0x25a/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_trace+0x2a2/0x2e0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] alloc_bprm+0x48/0x4b6 fs/exec.c:1507 kernel_execve+0x54/0x288 fs/exec.c:1947 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 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_thread_stack kernel/fork.c:297 [inline] release_task_stack kernel/fork.c:434 [inline] put_task_stack+0x1d0/0x2b0 kernel/fork.c:445 finish_task_switch.isra.0+0x3ce/0x420 kernel/sched/core.c:4898 schedule_tail+0xe/0xc8 kernel/sched/core.c:4922 ret_from_kernel_thread+0x4/0x10 arch/riscv/kernel/entry.S:494 Memory state around the buggy address: ffffaf800ee87a00: fc fc fc fc f1 f1 f1 f1 00 f3 f3 f3 fc fc fc fc ffffaf800ee87a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf800ee87b00: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 fc fc fc fc ^ ffffaf800ee87b80: 00 00 00 f3 f3 f3 f3 f3 fc fc fc fc fc fc fc fc ffffaf800ee87c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================