================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800f75fe80 by task syz-executor.1/2048 CPU: 0 PID: 2048 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 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 Allocated by task 259389664: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 168160 out of bounds (316) for stack id 836290e0 WARNING: CPU: 0 PID: 2048 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2048 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2048 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 : ffffaf800f75fd40 gp : ffffffff85863ac0 tp : ffffaf800d908000 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800f75fd50 s1 : ffffaf807aaa20c0 a0 : 000000000000003b a1 : 00000000000f0000 a2 : 0000000000000505 a3 : ffffffff8012252a a4 : fd93be3ce164fb00 a5 : fd93be3ce164fb00 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800f75fe80 s3 : ffffaf8007202000 s4 : ffffaf800f75f000 s5 : ffffaf800f75f800 s6 : 0000000000003fff s7 : ffffaf800f75fe20 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800f75ff00 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800f75f838 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 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 irq event stamp: 107053 hardirqs last enabled at (107052): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (107052): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (107053): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (107053): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (106928): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (106928): [] __ip6_ins_rt net/ipv6/route.c:1303 [inline] softirqs last enabled at (106928): [] ip6_route_add+0x7e/0x148 net/ipv6/route.c:3857 softirqs last disabled at (106945): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (106945): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (106945): [] __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 (316) for stack id ffffffff WARNING: CPU: 0 PID: 2048 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2048 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2048 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 : ffffaf800f75fd40 gp : ffffffff85863ac0 tp : ffffaf800d908000 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800f75fd50 s1 : ffffaf807aaa20c0 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000505 a3 : ffffffff8012252a a4 : fd93be3ce164fb00 a5 : fd93be3ce164fb00 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800f75fe80 s3 : ffffaf8007202000 s4 : ffffaf800f75f000 s5 : ffffaf800f75f800 s6 : 0000000000003fff s7 : ffffaf800f75fe20 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800f75ff00 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800f75f838 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 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 irq event stamp: 107053 hardirqs last enabled at (107052): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (107052): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (107053): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (107053): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (106928): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (106928): [] __ip6_ins_rt net/ipv6/route.c:1303 [inline] softirqs last enabled at (106928): [] ip6_route_add+0x7e/0x148 net/ipv6/route.c:3857 softirqs last disabled at (106945): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (106945): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (106945): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800f75f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1664 bytes to the right of 2048-byte region [ffffaf800f75f000, ffffaf800f75f800) The buggy address belongs to the page: page:ffffaf807aaa20c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8f958 head:ffffaf807aaa20c0 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000000 0000000000000122 ffffaf8007202000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2047, ts 1116341962400, free_ts 1110952027700 __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] __kmalloc_track_caller+0x25a/0x30e mm/slub.c:4926 kmemdup+0x2a/0x5a mm/util.c:128 neigh_sysctl_register+0xb2/0x380 net/core/neighbour.c:3725 addrconf_sysctl_register+0xa4/0x138 net/ipv6/addrconf.c:7074 ipv6_add_dev+0x610/0xa7e net/ipv6/addrconf.c:455 addrconf_notify+0x5e8/0x1360 net/ipv6/addrconf.c:3510 notifier_call_chain+0xb8/0x188 kernel/notifier.c:84 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] kmem_cache_alloc+0x338/0x3de mm/slub.c:3243 vm_area_alloc+0x2e/0xaa kernel/fork.c:349 mmap_region+0x62e/0xa88 mm/mmap.c:1773 do_mmap+0x784/0x8d2 mm/mmap.c:1582 vm_mmap_pgoff+0x1a2/0x24e mm/util.c:519 Memory state around the buggy address: ffffaf800f75fd80: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf800f75fe00: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc >ffffaf800f75fe80: fc fc fc fc fc fc fc fc fc fc fc fc f1 f1 f1 f1 ^ ffffaf800f75ff00: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffffaf800f75ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================