syzbot

task:klogd           state:R  running task     stack:0     pid:2977  tgid:2977  ppid:1      flags:0x00000000
Call Trace:
[<ffffffff861cbf70>] context_switch kernel/sched/core.c:5369 [inline]
[<ffffffff861cbf70>] __schedule+0xdaa/0x393a kernel/sched/core.c:6756
==================================================================
BUG: KASAN: stack-out-of-bounds in walk_stackframe+0x3f0/0x452 arch/riscv/kernel/stacktrace.c:66
Read of size 8 at addr ff20000006f27968 by task kworker/1:1/3252

CPU: 1 UID: 0 PID: 3252 Comm: kworker/1:1 Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: mm_percpu_wq vmstat_update
Call Trace:
[<ffffffff80071bae>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff8000325c>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:136
[<ffffffff8005e1f4>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005e1f4>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8000d250>] print_address_description mm/kasan/report.c:378 [inline]
[<ffffffff8000d250>] print_report+0x28e/0x5a8 mm/kasan/report.c:489
[<ffffffff80a1a0fe>] kasan_report+0xec/0x118 mm/kasan/report.c:602
[<ffffffff80a1bf64>] __asan_report_load8_noabort+0x12/0x1a mm/kasan/report_generic.c:381
[<ffffffff8007178a>] walk_stackframe+0x3f0/0x452 arch/riscv/kernel/stacktrace.c:66
[<ffffffff80071bae>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff8000325c>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:136
[<ffffffff801f500e>] sched_show_task kernel/sched/core.c:7711 [inline]
[<ffffffff801f500e>] sched_show_task+0x42c/0x5dc kernel/sched/core.c:7686
[<ffffffff802033e8>] show_state_filter+0xcc/0x28e kernel/sched/core.c:7756
[<ffffffff81cad27e>] show_state include/linux/sched/debug.h:21 [inline]
[<ffffffff81cad27e>] fn_show_state+0x1a/0x22 drivers/tty/vt/keyboard.c:614
[<ffffffff81cad874>] k_spec drivers/tty/vt/keyboard.c:667 [inline]
[<ffffffff81cad874>] k_spec+0x102/0x16c drivers/tty/vt/keyboard.c:656
[<ffffffff81cb0560>] kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
[<ffffffff81cb0560>] kbd_event+0x8ac/0x1056 drivers/tty/vt/keyboard.c:1541
[<ffffffff83d93c00>] input_handle_events_default+0xfe/0x174 drivers/input/input.c:2646
[<ffffffff83d9c1a4>] input_pass_values+0x6d4/0x7e8 drivers/input/input.c:126
[<ffffffff83d9dc60>] input_event_dispose drivers/input/input.c:341 [inline]
[<ffffffff83d9dc60>] input_handle_event+0x232/0x13e6 drivers/input/input.c:369
[<ffffffff83d9eeaa>] input_event drivers/input/input.c:398 [inline]
[<ffffffff83d9eeaa>] input_event+0x96/0xc8 drivers/input/input.c:390
[<ffffffff846c45ae>] input_sync include/linux/input.h:464 [inline]
[<ffffffff846c45ae>] hidinput_report_event+0xc0/0x114 drivers/hid/hid-input.c:1736
[<ffffffff846ba0f6>] hid_report_raw_event+0x26e/0x1146 drivers/hid/hid-core.c:2053
[<ffffffff846bb2c4>] __hid_input_report.constprop.0+0x2f6/0x3fa drivers/hid/hid-core.c:2116
[<ffffffff846bb3fa>] hid_input_report+0x32/0x44 drivers/hid/hid-core.c:2138
[<ffffffff8484f008>] hid_irq_in+0x2f6/0x732 drivers/hid/usbhid/hid-core.c:285
[<ffffffff835ce59a>] __usb_hcd_giveback_urb+0x362/0x6f4 drivers/usb/core/hcd.c:1650
[<ffffffff835cec90>] usb_hcd_giveback_urb+0x364/0x3fe drivers/usb/core/hcd.c:1734
[<ffffffff83b34500>] dummy_timer+0x134a/0x3458 drivers/usb/gadget/udc/dummy_hcd.c:1993
[<ffffffff803bcc82>] __run_hrtimer kernel/time/hrtimer.c:1739 [inline]
[<ffffffff803bcc82>] __hrtimer_run_queues+0x1ac/0xb3e kernel/time/hrtimer.c:1803
[<ffffffff803bd754>] hrtimer_run_softirq+0x140/0x2e6 kernel/time/hrtimer.c:1820
[<ffffffff8014ce16>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:554
[<ffffffff8014df62>] __do_softirq kernel/softirq.c:588 [inline]
[<ffffffff8014df62>] invoke_softirq kernel/softirq.c:428 [inline]
[<ffffffff8014df62>] __irq_exit_rcu+0x18c/0x550 kernel/softirq.c:655
[<ffffffff8014f31c>] irq_exit_rcu+0x10/0xf8 kernel/softirq.c:671
[<ffffffff861c1858>] handle_riscv_irq+0x40/0x4c arch/riscv/kernel/traps.c:378
[<ffffffff861e667e>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:355

The buggy address belongs to the virtual mapping at
 [ff20000006f20000, ff20000006f29000) created by:
 kernel_clone+0x11e/0xc3c kernel/fork.c:2807

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9d17c
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 2976, tgid 2976 (start-stop-daem), ts 105722602300, free_ts 77031024900
 __set_page_owner+0xa2/0x70c mm/page_owner.c:320
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xf0/0x1e8 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0xdb2/0x2c12 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x1e8/0x1fc0 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0xf8/0x488 mm/mempolicy.c:2269
 alloc_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2348
 vm_area_alloc_pages mm/vmalloc.c:3589 [inline]
 __vmalloc_area_node mm/vmalloc.c:3667 [inline]
 __vmalloc_node_range_noprof+0x642/0x120c mm/vmalloc.c:3844
 alloc_thread_stack_node kernel/fork.c:314 [inline]
 dup_task_struct kernel/fork.c:1121 [inline]
 copy_process+0x2c04/0x6c90 kernel/fork.c:2225
 kernel_clone+0x11e/0xc3c kernel/fork.c:2807
 __do_sys_clone+0xe4/0x118 kernel/fork.c:2950
 __se_sys_clone kernel/fork.c:2918 [inline]
 __riscv_sys_clone+0xa0/0x10e kernel/fork.c:2918
 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 910 tgid 910 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:1127 [inline]
 free_unref_page+0x61e/0x11d6 mm/page_alloc.c:2657
 __free_pages+0x13a/0x1ba mm/page_alloc.c:4838
 vfree+0x1b6/0xc88 mm/vmalloc.c:3382
 delayed_vfree_work+0x58/0x7a mm/vmalloc.c:3303
 process_one_work+0x968/0x1f38 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x5be/0xdc6 kernel/workqueue.c:3391
 kthread+0x28c/0x3a4 kernel/kthread.c:389
 ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326

Memory state around the buggy address:
 ff20000006f27800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ff20000006f27880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ff20000006f27900: 00 00 f2 f2 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
                                                          ^
 ff20000006f27980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ff20000006f27a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================