==================================================================
BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
Read of size 8 at addr ffffaf8010497fc0 by task syz-executor.0/2047

CPU: 0 PID: 2047 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000a228>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113
[<ffffffff831668cc>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119
[<ffffffff831756ba>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff831756ba>] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106
[<ffffffff8047479e>] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff8000a052>] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
[<ffffffff8000a4a4>] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146
[<ffffffff80162ac8>] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122

Allocated by task 1102416563:
(stack is not available)

Freed by task 2194:
 stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122
 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38
 kasan_set_track+0x1a/0x26 mm/kasan/common.c:45
 kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328
 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kmem_cache_free+0xca/0x482 mm/slub.c:3526
 putname+0xd8/0xe4 fs/namei.c:270
 user_path_at_empty+0x46/0x5a fs/namei.c:2853
 user_path_at include/linux/namei.h:57 [inline]
 user_statfs+0xa2/0x186 fs/statfs.c:103
 __do_sys_statfs+0x92/0xfe fs/statfs.c:195
 sys_statfs+0x20/0x2c fs/statfs.c:192
 ret_from_syscall+0x0/0x2

Last potentially related work creation:
------------[ cut here ]------------
slab index 1177136 out of bounds (290) for stack id 8451f630
WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline]
WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276
Modules linked in:
CPU: 0 PID: 2047 Comm: syz-executor.0 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 : ffffaf8010497e50
 gp : ffffffff85863ac0 tp : ffffaf800e6c9840 t0 : ffffffff86bcb657
 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf8010497e60
 s1 : ffffaf807aadd880 a0 : 000000000000003c a1 : 00000000000f0000
 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 2c9669d909bb5600
 a5 : 2c9669d909bb5600 a6 : 0000000000f00000 a7 : ffffaf805a9c8863
 s2 : ffffaf8010497fc0 s3 : ffffaf80072e9b40 s4 : ffffaf8010496600
 s5 : ffffaf8010497600 s6 : 0000000000003fff s7 : ffffaf8010497fb0
 s8 : ffffffff8000a4a4 s9 : ffffffffffffc000 s10: ffffaf8010498000
 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c
 t5 : fffff5ef0b53910d t6 : ffffaf8010497958
status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003
[<ffffffff80474a70>] describe_object_stacks mm/kasan/report.c:216 [inline]
[<ffffffff80474a70>] describe_object mm/kasan/report.c:231 [inline]
[<ffffffff80474a70>] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff8000a052>] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
[<ffffffff8000a4a4>] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146
[<ffffffff80162ac8>] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122
irq event stamp: 26533
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] read_seqbegin include/linux/seqlock.h:840 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] neigh_hh_output include/net/neighbour.h:495 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] neigh_output include/net/neighbour.h:539 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] ip_finish_output2+0x157a/0x1720 net/ipv4/ip_output.c:221
hardirqs last disabled at (26533): [<ffffffff831afa4e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (26533): [<ffffffff831afa4e>] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162
softirqs last  enabled at (26402): [<ffffffff831b0bd0>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (26402): [<ffffffff831b0bd0>] __do_softirq+0x618/0x8fc kernel/softirq.c:587
softirqs last disabled at (26411): [<ffffffff80061288>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (26411): [<ffffffff80061288>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (26411): [<ffffffff80061288>] __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 (290) for stack id ffffffff
WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline]
WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276
Modules linked in:
CPU: 0 PID: 2047 Comm: syz-executor.0 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 : ffffaf8010497e50
 gp : ffffffff85863ac0 tp : ffffaf800e6c9840 t0 : ffffffff86bcb657
 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf8010497e60
 s1 : ffffaf807aadd880 a0 : 000000000000003c a1 : 00000000000f0000
 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 2c9669d909bb5600
 a5 : 2c9669d909bb5600 a6 : 0000000000f00000 a7 : ffffaf805a9c8863
 s2 : ffffaf8010497fc0 s3 : ffffaf80072e9b40 s4 : ffffaf8010496600
 s5 : ffffaf8010497600 s6 : 0000000000003fff s7 : ffffaf8010497fb0
 s8 : ffffffff8000a4a4 s9 : ffffffffffffc000 s10: ffffaf8010498000
 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c
 t5 : fffff5ef0b53910d t6 : ffffaf8010497958
status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003
[<ffffffff80474a22>] describe_object_stacks mm/kasan/report.c:221 [inline]
[<ffffffff80474a22>] describe_object mm/kasan/report.c:231 [inline]
[<ffffffff80474a22>] print_address_description.constprop.0+0x2ae/0x330 mm/kasan/report.c:263
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff8000a052>] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
[<ffffffff8000a4a4>] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146
[<ffffffff80162ac8>] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122
irq event stamp: 26533
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] read_seqbegin include/linux/seqlock.h:840 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] neigh_hh_output include/net/neighbour.h:495 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] neigh_output include/net/neighbour.h:539 [inline]
hardirqs last  enabled at (26532): [<ffffffff82af6ea8>] ip_finish_output2+0x157a/0x1720 net/ipv4/ip_output.c:221
hardirqs last disabled at (26533): [<ffffffff831afa4e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (26533): [<ffffffff831afa4e>] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162
softirqs last  enabled at (26402): [<ffffffff831b0bd0>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (26402): [<ffffffff831b0bd0>] __do_softirq+0x618/0x8fc kernel/softirq.c:587
softirqs last disabled at (26411): [<ffffffff80061288>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (26411): [<ffffffff80061288>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (26411): [<ffffffff80061288>] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637
---[ end trace 0000000000000000 ]---

The buggy address belongs to the object at ffffaf8010496600
 which belongs to the cache names_cache of size 4096
The buggy address is located 2496 bytes to the right of
 4096-byte region [ffffaf8010496600, ffffaf8010497600)
The buggy address belongs to the page:
page:ffffaf807aadd880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x90690
head:ffffaf807aadd880 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x9000010200(slab|head|section=18|node=0|zone=0)
raw: 0000009000010200 0000000000000000 0000000000000122 ffffaf80072e9b40
raw: 0000000000000000 0000000000070007 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 2194, ts 1028513853300, free_ts 1028094329400
 __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
 getname_flags.part.0+0x48/0x2a4 fs/namei.c:138
 getname_flags include/linux/audit.h:323 [inline]
 getname+0x5e/0x90 fs/namei.c:217
 do_sys_openat2+0x112/0x31e fs/open.c:1208
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 sys_openat+0xdc/0x164 fs/open.c:1241
 ret_from_syscall+0x0/0x2
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_trace+0x278/0x2e0 mm/slub.c:3255
 kmalloc include/linux/slab.h:581 [inline]
 call_modprobe kernel/kmod.c:79 [inline]
 __request_module+0x2c2/0x922 kernel/kmod.c:170
 __rtnl_newlink+0x65a/0xfa0 net/core/rtnetlink.c:3430
 rtnl_newlink+0x60/0x8c net/core/rtnetlink.c:3527
 rtnetlink_rcv_msg+0x338/0x9a0 net/core/rtnetlink.c:5592

Memory state around the buggy address:
 ffffaf8010497e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffffaf8010497f00: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00
>ffffaf8010497f80: 00 00 00 00 00 00 00 00 fc fc fc fc f1 f1 f1 f1
                                           ^
 ffffaf8010498000: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffaf8010498080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================