================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf800f177f10 by task syz-executor.1/2044 CPU: 0 PID: 2044 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 1102416563: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 1176792 out of bounds (313) for stack id 8451f4d8 WARNING: CPU: 0 PID: 2044 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2044 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2044 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800f177ca0 gp : ffffffff85863ac0 tp : ffffaf8009f2b080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800f177cb0 s1 : ffffaf807aa87978 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 98c9ba13299d2200 a5 : 98c9ba13299d2200 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800f177f10 s3 : ffffaf80072edc80 s4 : ffffaf800f177dc0 s5 : ffffaf800f177ec0 s6 : ffffffff8588bb20 s7 : ffffffff85e09180 s8 : ffffaf800f177e20 s9 : ffffaf8009f2bc28 s10: ffffffff85899680 s11: ffffaf8009f2b080 t3 : ffffffff801163b2 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800f177798 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:216 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263 [] __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 irq event stamp: 107007 hardirqs last enabled at (107006): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (107006): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (107007): [] rmqueue_pcplist mm/page_alloc.c:3660 [inline] hardirqs last disabled at (107007): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last disabled at (107007): [] get_page_from_freelist+0xfbe/0x12d8 mm/page_alloc.c:4162 softirqs last enabled at (106870): [] inet6_fill_ifla6_attrs+0xb72/0xc28 net/ipv6/addrconf.c:5666 softirqs last disabled at (106881): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (106881): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (106881): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- Second to last potentially related work creation: ------------[ cut here ]------------ slab index 2097151 out of bounds (313) for stack id ffffffff WARNING: CPU: 0 PID: 2044 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2044 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2044 Comm: syz-executor.1 Tainted: G W 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800f177ca0 gp : ffffffff85863ac0 tp : ffffaf8009f2b080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800f177cb0 s1 : ffffaf807aa87978 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 98c9ba13299d2200 a5 : 98c9ba13299d2200 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800f177f10 s3 : ffffaf80072edc80 s4 : ffffaf800f177dc0 s5 : ffffaf800f177ec0 s6 : ffffffff8588bb20 s7 : ffffffff85e09180 s8 : ffffaf800f177e20 s9 : ffffaf8009f2bc28 s10: ffffffff85899680 s11: ffffaf8009f2b080 t3 : ffffffff801163b2 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800f177798 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:221 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2ae/0x330 mm/kasan/report.c:263 [] __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 irq event stamp: 107007 hardirqs last enabled at (107006): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (107006): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (107007): [] rmqueue_pcplist mm/page_alloc.c:3660 [inline] hardirqs last disabled at (107007): [] rmqueue mm/page_alloc.c:3698 [inline] hardirqs last disabled at (107007): [] get_page_from_freelist+0xfbe/0x12d8 mm/page_alloc.c:4162 softirqs last enabled at (106870): [] inet6_fill_ifla6_attrs+0xb72/0xc28 net/ipv6/addrconf.c:5666 softirqs last disabled at (106881): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (106881): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (106881): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800f177dc0 which belongs to the cache proc_dir_entry of size 256 The buggy address is located 80 bytes to the right of 256-byte region [ffffaf800f177dc0, ffffaf800f177ec0) The buggy address belongs to the page: page:ffffaf807aa87978 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8f377 flags: 0x8800000200(slab|section=17|node=0|zone=0) raw: 0000008800000200 0000000000000000 0000000000000122 ffffaf80072edc80 raw: 0000000000000000 00000000000c000c 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 2045, ts 1189046836100, free_ts 1187318252300 __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 kmem_cache_zalloc include/linux/slab.h:705 [inline] __proc_create+0x252/0x53a fs/proc/generic.c:426 proc_create_reg+0x72/0x114 fs/proc/generic.c:550 proc_create_single_data+0x9e/0x122 fs/proc/generic.c:650 snmp6_register_dev+0x82/0xc4 net/ipv6/proc.c:256 ipv6_add_dev+0x3fa/0xa7e net/ipv6/addrconf.c:419 addrconf_notify+0x5e8/0x1360 net/ipv6/addrconf.c:3510 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_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __slab_free+0x20a/0x29c mm/slub.c:3414 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 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] __kmalloc_track_caller+0x156/0x30e mm/slub.c:4926 kmemdup+0x2a/0x5a mm/util.c:128 __addrconf_sysctl_register+0xb0/0x2c2 net/ipv6/addrconf.c:7013 addrconf_sysctl_register net/ipv6/addrconf.c:7078 [inline] addrconf_sysctl_register+0x106/0x138 net/ipv6/addrconf.c:7067 ipv6_add_dev+0x610/0xa7e net/ipv6/addrconf.c:455 Memory state around the buggy address: ffffaf800f177e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf800f177e80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 >ffffaf800f177f00: fc fc fc fc 00 00 00 f3 f3 f3 f3 f3 fc fc fc fc ^ ffffaf800f177f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffffaf800f178000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================