================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800cd87f60 by task syz-executor.1/2045 CPU: 0 PID: 2045 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 Allocated by task 1284: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 1189162 out of bounds (292) for stack id 8012252a WARNING: CPU: 0 PID: 2045 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2045 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2045 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 : ffffaf800cd87e20 gp : ffffffff85863ac0 tp : ffffaf800e641840 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800cd87e30 s1 : ffffaf807a9e5d20 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 34b3305d6bdeb400 a5 : 34b3305d6bdeb400 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800cd87f60 s3 : ffffaf8007201c80 s4 : ffffaf800cd87c00 s5 : ffffaf800cd87e00 s6 : 0000000000003fff s7 : ffffaf800cd87f00 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800cd87fe0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800cd87918 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 irq event stamp: 54317 hardirqs last enabled at (54316): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (54316): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (54317): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (54317): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (54178): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (54178): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (54181): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (54181): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (54181): [] __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 (292) for stack id ffffffff WARNING: CPU: 0 PID: 2045 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2045 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2045 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 : ffffaf800cd87e20 gp : ffffffff85863ac0 tp : ffffaf800e641840 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800cd87e30 s1 : ffffaf807a9e5d20 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 34b3305d6bdeb400 a5 : 34b3305d6bdeb400 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800cd87f60 s3 : ffffaf8007201c80 s4 : ffffaf800cd87c00 s5 : ffffaf800cd87e00 s6 : 0000000000003fff s7 : ffffaf800cd87f00 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800cd87fe0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800cd87918 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 irq event stamp: 54317 hardirqs last enabled at (54316): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (54316): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (54317): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (54317): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (54178): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (54178): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (54181): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (54181): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (54181): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800cd87c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 352 bytes to the right of 512-byte region [ffffaf800cd87c00, ffffaf800cd87e00) The buggy address belongs to the page: page:ffffaf807a9e5d20 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8cf84 head:ffffaf807a9e5d20 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000000 0000000000000122 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 0x52800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, ts 53344123600, free_ts 52994761300 __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_page_interleave+0x2a/0x1cc mm/mempolicy.c:2116 alloc_pages+0x210/0x2a6 mm/mempolicy.c:2266 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] kmem_cache_alloc_node_trace+0x1ea/0x2e2 mm/slub.c:3280 kmalloc_node include/linux/slab.h:599 [inline] kzalloc_node include/linux/slab.h:726 [inline] iolatency_pd_alloc+0x86/0x110 block/blk-iolatency.c:949 blkcg_activate_policy block/blk-cgroup.c:1329 [inline] blkcg_activate_policy+0x184/0x7b4 block/blk-cgroup.c:1302 blk_iolatency_init+0x11c/0x22e block/blk-iolatency.c:736 blkcg_init_queue+0x1a8/0x6c6 block/blk-cgroup.c:1206 blk_alloc_queue+0x322/0x584 block/blk-core.c:501 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 context_switch kernel/sched/core.c:4989 [inline] __schedule+0x58e/0x118e kernel/sched/core.c:6296 schedule_idle+0x22/0x42 kernel/sched/core.c:6397 do_idle+0xca/0x144 kernel/sched/idle.c:334 cpu_startup_entry+0x1a/0x1c kernel/sched/idle.c:403 smp_callin+0xa2/0xb0 arch/riscv/kernel/smpboot.c:184 Memory state around the buggy address: ffffaf800cd87e00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffffaf800cd87e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffaf800cd87f00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffffaf800cd87f80: fc fc fc fc fc fc fc fc f1 f1 f1 f1 00 00 00 f3 ffffaf800cd88000: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================