syzbot

[<ffffffff84c8b694>] kmalloc_reserve+0xfe/0x2be net/core/skbuff.c:609
[<ffffffff84c98a7e>] __alloc_skb+0x152/0x42a net/core/skbuff.c:678
[<ffffffff84cb19fc>] alloc_skb include/linux/skbuff.h:1322 [inline]
[<ffffffff84cb19fc>] alloc_skb_with_frags+0xe2/0x836 net/core/skbuff.c:6612
==================================================================
BUG: KASAN: stack-out-of-bounds in walk_stackframe+0x3f0/0x452 arch/riscv/kernel/stacktrace.c:66
Read of size 8 at addr ff20000007517878 by task ksoftirqd/0/16

CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-rc6-syzkaller-g57f7c7dc78cd #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80010a0c>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff85f822a0>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:136
[<ffffffff85fdd896>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff85fdd896>] dump_stack_lvl+0x122/0x196 lib/dump_stack.c:120
[<ffffffff85f8c0c4>] print_address_description mm/kasan/report.c:377 [inline]
[<ffffffff85f8c0c4>] print_report+0x290/0x5a0 mm/kasan/report.c:488
[<ffffffff809708ec>] kasan_report+0xec/0x118 mm/kasan/report.c:601
[<ffffffff80972768>] __asan_report_load8_noabort+0x12/0x1a mm/kasan/report_generic.c:381
[<ffffffff8001077c>] walk_stackframe+0x3f0/0x452 arch/riscv/kernel/stacktrace.c:66
[<ffffffff80010a0c>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff85f822a0>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:136
[<ffffffff80181cb0>] sched_show_task kernel/sched/core.c:7604 [inline]
[<ffffffff80181cb0>] sched_show_task+0x42c/0x5dc kernel/sched/core.c:7579
[<ffffffff8018f912>] show_state_filter+0xcc/0x28e kernel/sched/core.c:7649
[<ffffffff81b29ae2>] show_state include/linux/sched/debug.h:21 [inline]
[<ffffffff81b29ae2>] fn_show_state+0x1a/0x22 drivers/tty/vt/keyboard.c:614
[<ffffffff81b2a0d8>] k_spec drivers/tty/vt/keyboard.c:667 [inline]
[<ffffffff81b2a0d8>] k_spec+0x102/0x16c drivers/tty/vt/keyboard.c:656
[<ffffffff81b2cdc4>] kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
[<ffffffff81b2cdc4>] kbd_event+0x8ac/0x1056 drivers/tty/vt/keyboard.c:1541
[<ffffffff83bc5fcc>] input_handle_events_default+0xfe/0x174 drivers/input/input.c:2641
[<ffffffff83bce48c>] input_pass_values+0x6d4/0x7e8 drivers/input/input.c:126
[<ffffffff83bd024c>] input_event_dispose drivers/input/input.c:352 [inline]
[<ffffffff83bd024c>] input_handle_event+0x536/0x13e6 drivers/input/input.c:369
[<ffffffff83bd1192>] input_event drivers/input/input.c:398 [inline]
[<ffffffff83bd1192>] input_event+0x96/0xc8 drivers/input/input.c:390
[<ffffffff844ee6b4>] hidinput_hid_event+0x722/0x23fe drivers/hid/hid-input.c:1719
[<ffffffff844d6aea>] hid_process_event+0x48a/0x59e drivers/hid/hid-core.c:1540
[<ffffffff844d709c>] hid_input_array_field+0x49e/0x66e drivers/hid/hid-core.c:1652
[<ffffffff844d7c40>] hid_process_report drivers/hid/hid-core.c:1694 [inline]
[<ffffffff844d7c40>] hid_report_raw_event+0x9d4/0x10f4 drivers/hid/hid-core.c:2040
[<ffffffff844d8656>] __hid_input_report.constprop.0+0x2f6/0x3fc drivers/hid/hid-core.c:2110
[<ffffffff844d878e>] hid_input_report+0x32/0x44 drivers/hid/hid-core.c:2132
[<ffffffff84669120>] hid_irq_in+0x2f6/0x732 drivers/hid/usbhid/hid-core.c:285
[<ffffffff8341911e>] __usb_hcd_giveback_urb+0x362/0x6f4 drivers/usb/core/hcd.c:1650
[<ffffffff83419814>] usb_hcd_giveback_urb+0x364/0x3fe drivers/usb/core/hcd.c:1734
[<ffffffff83969dbc>] dummy_timer+0x134a/0x3458 drivers/usb/gadget/udc/dummy_hcd.c:1993
[<ffffffff8033bb72>] __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
[<ffffffff8033bb72>] __hrtimer_run_queues+0x19c/0x9d0 kernel/time/hrtimer.c:1755
[<ffffffff8033c4e6>] hrtimer_run_softirq+0x140/0x2e6 kernel/time/hrtimer.c:1772
[<ffffffff800e0a66>] handle_softirqs+0x4a6/0x10de kernel/softirq.c:554
[<ffffffff800e176c>] run_ksoftirqd kernel/softirq.c:927 [inline]
[<ffffffff800e176c>] run_ksoftirqd+0xce/0x144 kernel/softirq.c:919
[<ffffffff8016aa56>] smpboot_thread_fn+0x654/0xb98 kernel/smpboot.c:164
[<ffffffff80154924>] kthread+0x28c/0x3a6 kernel/kthread.c:389
[<ffffffff86002ace>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326

The buggy address belongs to the virtual mapping at
 [ff20000007510000, ff20000007519000) created by:
 kernel_clone+0x11e/0x92c kernel/fork.c:2786

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x982b5
flags: 0xffe000000000000(node=0|zone=0|lastcpupid=0x7ff)
raw: 0ffe000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2972, tgid 2972 (start-stop-daem), ts 125032204300, free_ts 123366272100
 __set_page_owner+0xa2/0x70c mm/page_owner.c:320
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xec/0x1e4 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0xdaa/0x295a mm/page_alloc.c:3457
 __alloc_pages_noprof+0x1e2/0x1e96 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0xf8/0x48a mm/mempolicy.c:2265
 alloc_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2345
 vm_area_alloc_pages mm/vmalloc.c:3568 [inline]
 __vmalloc_area_node mm/vmalloc.c:3646 [inline]
 __vmalloc_node_range_noprof+0x642/0x1450 mm/vmalloc.c:3828
 alloc_thread_stack_node kernel/fork.c:315 [inline]
 dup_task_struct kernel/fork.c:1116 [inline]
 copy_process+0x3658/0x8e52 kernel/fork.c:2204
 kernel_clone+0x11e/0x92c kernel/fork.c:2786
 __do_sys_clone+0xe4/0x118 kernel/fork.c:2929
 __se_sys_clone kernel/fork.c:2897 [inline]
 __riscv_sys_clone+0xa0/0x10e kernel/fork.c:2897
 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
 do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
 _new_vmalloc_restore_context_a0+0xc2/0xce
page last free pid 2970 tgid 2970 stack trace:
 __reset_page_owner+0x8c/0x400 mm/page_owner.c:297
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0x592/0xf08 mm/page_alloc.c:2638
 __free_pages+0x13c/0x1bc mm/page_alloc.c:4820
 __free_slab+0xd0/0x176 mm/slub.c:2648
 free_slab+0x38/0x1ae mm/slub.c:2671
 discard_slab mm/slub.c:2677 [inline]
 __put_partials+0x174/0x1de mm/slub.c:3145
 put_cpu_partial+0x17e/0x298 mm/slub.c:3220
 __slab_free+0x112/0x3f6 mm/slub.c:4449
 do_slab_free mm/slub.c:4531 [inline]
 ___cache_free+0x1a6/0x1e0 mm/slub.c:4637
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x76/0x16c mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x158/0x1ba mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x5c/0x82 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:247 [inline]
 slab_post_alloc_hook mm/slub.c:4085 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 kmem_cache_alloc_noprof+0x1a2/0x304 mm/slub.c:4141
 getname_flags.part.0+0x50/0x4b6 fs/namei.c:139
 getname_flags+0x98/0xd8 include/linux/audit.h:322
 vfs_fstatat+0x82/0x17e fs/stat.c:340

Memory state around the buggy address:
 ff20000007517700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ff20000007517780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ff20000007517800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                                ^
 ff20000007517880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ff20000007517900: 00 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 f3
==================================================================