================================================================== BUG: KASAN: slab-out-of-bounds in __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] BUG: KASAN: slab-out-of-bounds in _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 Read of size 1 at addr ffff888021836be0 by task syz.1.733/8398 CPU: 1 UID: 0 PID: 8398 Comm: syz.1.733 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xcd/0x680 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 __kasan_check_byte+0x36/0x50 mm/kasan/common.c:557 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire kernel/locking/lockdep.c:5845 [inline] lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5828 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] futex_rehash_private kernel/futex/core.c:213 [inline] __futex_pivot_hash+0x1dd/0x540 kernel/futex/core.c:251 futex_hash_allocate+0xad1/0xf00 kernel/futex/core.c:1662 futex_hash_prctl+0x1f4/0x650 kernel/futex/core.c:1757 __do_sys_prctl+0x171f/0x24c0 kernel/sys.c:2825 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc68cd8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc68db8d038 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007fc68cfb6080 RCX: 00007fc68cd8e929 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007fc68ce10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc68cfb6080 R15: 00007ffc84fe8de8 Allocated by task 8397: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kvmalloc_node_noprof+0x27b/0x620 mm/slub.c:5015 futex_hash_allocate+0x49d/0xf00 kernel/futex/core.c:1601 futex_hash_prctl+0x1f4/0x650 kernel/futex/core.c:1757 __do_sys_prctl+0x171f/0x24c0 kernel/sys.c:2825 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888021836b80 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 32 bytes to the right of allocated 64-byte region [ffff888021836b80, ffff888021836bc0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21836 memcg:ffff888025087e01 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b849a40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080200020 00000000f5000000 ffff888025087e01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 3808576236, free_ts 3795513848 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x23b/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x3b1/0x620 mm/slub.c:5015 alloc_netdev_mqs+0xfbe/0x1570 net/core/dev.c:11793 mptcp_proto_init+0x82/0x370 net/mptcp/protocol.c:4036 mptcp_init+0x14/0x50 net/mptcp/ctrl.c:569 tcp_init+0x82c/0xaf0 net/ipv4/tcp.c:5247 inet_init+0x419/0x6f0 net/ipv4/af_inet.c:1975 do_one_initcall+0x120/0x6e0 init/main.c:1274 do_initcall_level init/main.c:1336 [inline] do_initcalls init/main.c:1352 [inline] do_basic_setup init/main.c:1371 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1584 kernel_init+0x1c/0x2b0 init/main.c:1474 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 ___free_pages_bulk mm/kasan/shadow.c:332 [inline] __kasan_populate_vmalloc mm/kasan/shadow.c:375 [inline] kasan_populate_vmalloc+0x18c/0x1f0 mm/kasan/shadow.c:417 alloc_vmap_area+0x959/0x29c0 mm/vmalloc.c:2084 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3179 __vmalloc_node_range_noprof+0x271/0x14b0 mm/vmalloc.c:3845 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3948 __vmalloc_area_node mm/vmalloc.c:3687 [inline] __vmalloc_node_range_noprof+0xb73/0x14b0 mm/vmalloc.c:3885 vmalloc_huge_node_noprof+0xa7/0xf0 mm/vmalloc.c:4001 vmalloc_huge include/linux/vmalloc.h:185 [inline] alloc_large_system_hash+0x27d/0x640 mm/mm_init.c:2515 tcp_init+0x350/0xaf0 net/ipv4/tcp.c:5203 inet_init+0x419/0x6f0 net/ipv4/af_inet.c:1975 do_one_initcall+0x120/0x6e0 init/main.c:1274 do_initcall_level init/main.c:1336 [inline] do_initcalls init/main.c:1352 [inline] do_basic_setup init/main.c:1371 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1584 kernel_init+0x1c/0x2b0 init/main.c:1474 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888021836a80: 00 00 00 00 00 02 fc fc fc fc fc fc fc fc fc fc ffff888021836b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888021836b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888021836c00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888021836c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================