RBP: 00007f13f3ef21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000002
R13: 00007ffedf072e6f R14: 00007f13f3ef2300 R15: 0000000000022000
 </TASK>
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline]
BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]
BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]
BUG: KASAN: use-after-free in kref_put include/linux/kref.h:64 [inline]
BUG: KASAN: use-after-free in anon_vma_name_put include/linux/mm_inline.h:343 [inline]
BUG: KASAN: use-after-free in free_anon_vma_name include/linux/mm_inline.h:374 [inline]
BUG: KASAN: use-after-free in vm_area_free+0x7e/0x230 kernel/fork.c:400
Write of size 4 at addr ffff88812d202181 by task syz-executor.2/5025

CPU: 1 PID: 5025 Comm: syz-executor.2 Not tainted 5.15.78-syzkaller-00911-gc73b4619ad86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3d0 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452
 kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline]
 __refcount_sub_and_test include/linux/refcount.h:272 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 kref_put include/linux/kref.h:64 [inline]
 anon_vma_name_put include/linux/mm_inline.h:343 [inline]
 free_anon_vma_name include/linux/mm_inline.h:374 [inline]
 vm_area_free+0x7e/0x230 kernel/fork.c:400
 dup_mmap+0xbcd/0xea0 kernel/fork.c:671
 dup_mm+0x91/0x330 kernel/fork.c:1502
 copy_mm+0x108/0x1b0 kernel/fork.c:1554
 copy_process+0x1295/0x3250 kernel/fork.c:2245
 kernel_clone+0x22d/0x990 kernel/fork.c:2646
 __do_sys_clone kernel/fork.c:2772 [inline]
 __se_sys_clone kernel/fork.c:2756 [inline]
 __x64_sys_clone+0x289/0x310 kernel/fork.c:2756
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f13f517f0a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f13f3ef2118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f13f529ef80 RCX: 00007f13f517f0a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000980000
RBP: 00007f13f3ef21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000002
R13: 00007ffedf072e6f R14: 00007f13f3ef2300 R15: 0000000000022000
 </TASK>

Allocated by task 4941:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook mm/slab.h:550 [inline]
 slab_alloc_node mm/slub.c:3236 [inline]
 slab_alloc mm/slub.c:3244 [inline]
 kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249
 vm_area_dup+0x26/0x1d0 kernel/fork.c:367
 dup_mmap+0x6b8/0xea0 kernel/fork.c:591
 dup_mm+0x91/0x330 kernel/fork.c:1502
 copy_mm+0x108/0x1b0 kernel/fork.c:1554
 copy_process+0x1295/0x3250 kernel/fork.c:2245
 kernel_clone+0x22d/0x990 kernel/fork.c:2646
 __do_sys_clone kernel/fork.c:2772 [inline]
 __se_sys_clone kernel/fork.c:2756 [inline]
 __x64_sys_clone+0x289/0x310 kernel/fork.c:2756
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 4949:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1721 [inline]
 slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747
 slab_free mm/slub.c:3515 [inline]
 kmem_cache_free+0x11a/0x2e0 mm/slub.c:3531
 ____vm_area_free kernel/fork.c:386 [inline]
 vm_area_free+0x1ae/0x230 kernel/fork.c:412
 remove_vma mm/mmap.c:190 [inline]
 exit_mmap+0x5dd/0x7a0 mm/mmap.c:3208
 __mmput+0x95/0x300 kernel/fork.c:1162
 mmput+0x50/0x60 kernel/fork.c:1184
 exit_mm+0x50d/0x760 kernel/exit.c:504
 do_exit+0x63c/0x24d0 kernel/exit.c:815
 do_group_exit+0x13a/0x300 kernel/exit.c:925
 get_signal+0x77e/0x1600 kernel/signal.c:2890
 arch_do_signal_or_restart+0x9f/0x670 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0xd4/0x110 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0x3b/0x40 kernel/entry/common.c:207
 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:313
 irqentry_exit+0x12/0x40 kernel/entry/common.c:404
 exc_page_fault+0x75/0x1a0 arch/x86/mm/fault.c:1620
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568

The buggy address belongs to the object at ffff88812d202128
 which belongs to the cache vm_area_struct of size 232
The buggy address is located 89 bytes inside of
 232-byte region [ffff88812d202128, ffff88812d202210)
The buggy address belongs to the page:
page:ffffea0004b48080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d202
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100275500
raw: 0000000000000000 00000000000d000d 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 430, ts 1950940903413, free_ts 1950937289110
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495
 prep_new_page mm/page_alloc.c:2501 [inline]
 get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281
 __alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548
 allocate_slab+0x62/0x580 mm/slub.c:1928
 new_slab mm/slub.c:1991 [inline]
 ___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024
 __slab_alloc+0x4a/0x90 mm/slub.c:3111
 slab_alloc_node mm/slub.c:3202 [inline]
 slab_alloc mm/slub.c:3244 [inline]
 kmem_cache_alloc+0x205/0x2f0 mm/slub.c:3249
 vm_area_dup+0x26/0x1d0 kernel/fork.c:367
 dup_mmap+0x6b8/0xea0 kernel/fork.c:591
 dup_mm+0x91/0x330 kernel/fork.c:1502
 copy_mm+0x108/0x1b0 kernel/fork.c:1554
 copy_process+0x1295/0x3250 kernel/fork.c:2245
 kernel_clone+0x22d/0x990 kernel/fork.c:2646
 __do_sys_clone kernel/fork.c:2772 [inline]
 __se_sys_clone kernel/fork.c:2756 [inline]
 __x64_sys_clone+0x289/0x310 kernel/fork.c:2756
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1364 [inline]
 free_pcp_prepare+0x448/0x450 mm/page_alloc.c:1435
 free_unref_page_prepare mm/page_alloc.c:3433 [inline]
 free_unref_page_list+0x16a/0xad0 mm/page_alloc.c:3554
 release_pages+0xf3e/0xf90 mm/swap.c:1010
 free_pages_and_swap_cache+0x97/0xb0 mm/swap_state.c:320
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu+0x860/0xa00 mm/mmu_gather.c:249
 tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:340
 exit_mmap+0x46e/0x7a0 mm/mmap.c:3202
 __mmput+0x95/0x300 kernel/fork.c:1162
 mmput+0x50/0x60 kernel/fork.c:1184
 exit_mm+0x50d/0x760 kernel/exit.c:504
 do_exit+0x63c/0x24d0 kernel/exit.c:815
 do_group_exit+0x13a/0x300 kernel/exit.c:925
 get_signal+0x77e/0x1600 kernel/signal.c:2890
 arch_do_signal_or_restart+0x9f/0x670 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0xd4/0x110 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:207 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x79/0xc0 kernel/entry/common.c:300

Memory state around the buggy address:
 ffff88812d202080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff88812d202100: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
>ffff88812d202180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88812d202200: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb
 ffff88812d202280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 5025 at lib/refcount.c:28 refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 5025 Comm: syz-executor.2 Tainted: G    B             5.15.78-syzkaller-00911-gc73b4619ad86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:refcount_warn_saturate+0x165/0x1b0 lib/refcount.c:28
Code: c7 80 61 87 85 31 c0 e8 39 2f e0 fe 0f 0b eb 83 e8 d0 bc 0e ff c6 05 1f 3b 9f 04 01 48 c7 c7 e0 61 87 85 31 c0 e8 1b 2f e0 fe <0f> 0b e9 62 ff ff ff e8 af bc 0e ff c6 05 ff 3a 9f 04 01 48 c7 c7
RSP: 0018:ffffc900061bf900 EFLAGS: 00010246
RAX: 808f8abff2da9100 RBX: 0000000000000003 RCX: 0000000000040000
RDX: ffffc90002e0a000 RSI: 000000000003934f RDI: 0000000000039350
RBP: ffffc900061bf910 R08: ffffffff81584ba9 R09: ffffed103ee065e8
R10: ffffed103ee065e8 R11: 1ffff1103ee065e7 R12: ffff88817532d8b8
R13: 1ffff1102ea65b17 R14: 0000000000000003 R15: ffff88812d202181
FS:  00007f13f3ef2700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055964ac82048 CR3: 000000010d5bb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 kref_put include/linux/kref.h:64 [inline]
 anon_vma_name_put include/linux/mm_inline.h:343 [inline]
 free_anon_vma_name include/linux/mm_inline.h:374 [inline]
 vm_area_free+0x208/0x230 kernel/fork.c:400
 dup_mmap+0xbcd/0xea0 kernel/fork.c:671
 dup_mm+0x91/0x330 kernel/fork.c:1502
 copy_mm+0x108/0x1b0 kernel/fork.c:1554
 copy_process+0x1295/0x3250 kernel/fork.c:2245
 kernel_clone+0x22d/0x990 kernel/fork.c:2646
 __do_sys_clone kernel/fork.c:2772 [inline]
 __se_sys_clone kernel/fork.c:2756 [inline]
 __x64_sys_clone+0x289/0x310 kernel/fork.c:2756
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f13f517f0a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f13f3ef2118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f13f529ef80 RCX: 00007f13f517f0a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000980000
RBP: 00007f13f3ef21d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000002
R13: 00007ffedf072e6f R14: 00007f13f3ef2300 R15: 0000000000022000
 </TASK>
---[ end trace 453d9b1e357622e7 ]---