task:syz-executor    state:R  running task     stack:0     pid:5038  tgid:5038  ppid:5035   flags:0x00000002
Call Trace:
[<ffffffff8608aa96>] context_switch kernel/sched/core.c:5328 [inline]
[<ffffffff8608aa96>] __schedule+0xd58/0x3848 kernel/sched/core.c:6690
==================================================================
BUG: KASAN: stack-out-of-bounds in walk_stackframe+0x3f0/0x452 arch/riscv/kernel/stacktrace.c:66
Read of size 8 at addr ff20000003977828 by task kworker/0:1/5028

CPU: 0 UID: 0 PID: 5028 Comm: kworker/0:1 Not tainted 6.12.0-rc6-syzkaller-g57f7c7dc78cd #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: wg-crypt-wg2 wg_packet_encrypt_worker
Call Trace:
[<ffffffff80010a0c>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff86023314>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:136
[<ffffffff8607e98a>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8607e98a>] dump_stack_lvl+0x122/0x196 lib/dump_stack.c:120
[<ffffffff8602d138>] print_address_description mm/kasan/report.c:377 [inline]
[<ffffffff8602d138>] 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
[<ffffffff86023314>] 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
[<ffffffff81bcab56>] show_state include/linux/sched/debug.h:21 [inline]
[<ffffffff81bcab56>] fn_show_state+0x1a/0x22 drivers/tty/vt/keyboard.c:614
[<ffffffff81bcb14c>] k_spec drivers/tty/vt/keyboard.c:667 [inline]
[<ffffffff81bcb14c>] k_spec+0x102/0x16c drivers/tty/vt/keyboard.c:656
[<ffffffff81bcde38>] kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
[<ffffffff81bcde38>] kbd_event+0x8ac/0x1056 drivers/tty/vt/keyboard.c:1541
[<ffffffff83c67040>] input_handle_events_default+0xfe/0x174 drivers/input/input.c:2641
[<ffffffff83c6f500>] input_pass_values+0x6d4/0x7e8 drivers/input/input.c:126
[<ffffffff83c70fbc>] input_event_dispose drivers/input/input.c:341 [inline]
[<ffffffff83c70fbc>] input_handle_event+0x232/0x13e6 drivers/input/input.c:369
[<ffffffff83c72f36>] input_repeat_key+0x1f6/0x316 drivers/input/input.c:2316
[<ffffffff80334a06>] call_timer_fn+0x1d2/0x874 kernel/time/timer.c:1794
[<ffffffff8033620a>] expire_timers kernel/time/timer.c:1845 [inline]
[<ffffffff8033620a>] __run_timers+0x646/0x820 kernel/time/timer.c:2419
[<ffffffff8033650e>] __run_timer_base kernel/time/timer.c:2430 [inline]
[<ffffffff8033650e>] __run_timer_base kernel/time/timer.c:2423 [inline]
[<ffffffff8033650e>] run_timer_base+0x12a/0x1a6 kernel/time/timer.c:2439
[<ffffffff803365a2>] run_timer_softirq+0x18/0x42 kernel/time/timer.c:2449
[<ffffffff800e0a66>] handle_softirqs+0x4a6/0x10de kernel/softirq.c:554
[<ffffffff800e196a>] __do_softirq kernel/softirq.c:588 [inline]
[<ffffffff800e196a>] invoke_softirq kernel/softirq.c:428 [inline]
[<ffffffff800e196a>] __irq_exit_rcu+0x188/0x372 kernel/softirq.c:637
[<ffffffff800e2598>] irq_exit_rcu+0x10/0xf8 kernel/softirq.c:649
[<ffffffff86080504>] handle_riscv_irq+0x40/0x4c arch/riscv/kernel/traps.c:378
[<ffffffff860a3bfe>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:355

The buggy address belongs to the virtual mapping at
 [ff20000003970000, ff20000003979000) 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:0xff6000001e0dddc0 pfn:0x9e0dd
flags: 0xffe000000000000(node=0|zone=0|lastcpupid=0x7ff)
raw: 0ffe000000000000 0000000000000000 dead000000000122 0000000000000000
raw: ff6000001e0dddc0 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 4382, tgid 4382 (syz-executor), ts 1533263160500, free_ts 1533153214400
 __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 4382 tgid 4382 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
 ext4_mb_clear_bb fs/ext4/mballoc.c:6492 [inline]
 ext4_free_blocks+0x96a/0x1fbc fs/ext4/mballoc.c:6652
 ext4_remove_blocks fs/ext4/extents.c:2547 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2712 [inline]
 ext4_ext_remove_space+0x2210/0x4968 fs/ext4/extents.c:2961
 ext4_ext_truncate+0x1f4/0x2a8 fs/ext4/extents.c:4466

Memory state around the buggy address:
 ff20000003977700: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ff20000003977780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ff20000003977800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                  ^
 ff20000003977880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ff20000003977900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
==================================================================