================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf80202abf50 by task syz-executor.1/2051 CPU: 0 PID: 2051 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 0: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 700544 out of bounds (292) for stack id 0bcab080 WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2051 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 : ffffaf80202abe10 gp : ffffffff85863ac0 tp : ffffaf800bcab080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf80202abe20 s1 : ffffaf807af54fd0 a0 : 000000000000003b a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 380ba7de3fe16200 a5 : 380ba7de3fe16200 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf80202abf50 s3 : ffffaf80072ed140 s4 : ffffaf80202abe00 s5 : ffffaf80202abf40 s6 : 0000000000003fff s7 : ffffaf80202abef0 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf80202abfc0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf80202ab918 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: 58697 hardirqs last enabled at (58696): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (58696): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (58697): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (58697): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (58620): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (58620): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (58623): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (58623): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (58623): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- Second to last potentially related work creation: ------------[ cut here ]------------ slab index 2076544 out of bounds (292) for stack id ffffaf80 WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2051 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2051 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 : ffffaf80202abe10 gp : ffffffff85863ac0 tp : ffffaf800bcab080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf80202abe20 s1 : ffffaf807af54fd0 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 380ba7de3fe16200 a5 : 380ba7de3fe16200 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf80202abf50 s3 : ffffaf80072ed140 s4 : ffffaf80202abe00 s5 : ffffaf80202abf40 s6 : 0000000000003fff s7 : ffffaf80202abef0 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf80202abfc0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf80202ab918 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: 58697 hardirqs last enabled at (58696): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (58696): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (58697): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (58697): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (58620): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (58620): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (58623): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (58623): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (58623): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf80202abe00 which belongs to the cache mnt_cache of size 320 The buggy address is located 16 bytes to the right of 320-byte region [ffffaf80202abe00, ffffaf80202abf40) The buggy address belongs to the page: page:ffffaf807af54fd0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa04aa head:ffffaf807af54fd0 order:1 compound_mapcount:0 flags: 0xa000010200(slab|head|section=20|node=0|zone=0) raw: 000000a000010200 0000000000000000 0000000000000122 ffffaf80072ed140 raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2051, ts 711010772500, free_ts 0 __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+0x39c/0x3de mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] alloc_vfsmnt+0x32/0x2ea fs/namespace.c:198 clone_mnt+0x4a/0x75a fs/namespace.c:1061 copy_tree+0x2bc/0x6c8 fs/namespace.c:1878 copy_mnt_ns+0x174/0x71c fs/namespace.c:3434 create_new_namespaces+0xac/0x6f8 kernel/nsproxy.c:78 unshare_nsproxy_namespaces+0xa2/0x144 kernel/nsproxy.c:226 page_owner free stack trace missing Memory state around the buggy address: ffffaf80202abe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf80202abe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffaf80202abf00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffffaf80202abf80: fc fc fc fc f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ffffaf80202ac000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================