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BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-use-after-free in mapping_inaccessible include/linux/pagemap.h:335 [inline]
BUG: KASAN: slab-use-after-free in isolate_migratepages_block+0x3eb3/0x56f0 mm/compaction.c:1182
Read of size 8 at addr ffff8880236711d8 by task kcompactd0/44

CPU: 3 UID: 0 PID: 44 Comm: kcompactd0 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 mapping_inaccessible include/linux/pagemap.h:335 [inline]
 isolate_migratepages_block+0x3eb3/0x56f0 mm/compaction.c:1182
 isolate_migratepages mm/compaction.c:2167 [inline]
 compact_zone+0x1a5e/0x4220 mm/compaction.c:2633
 compact_node+0x1a4/0x2d0 mm/compaction.c:2932
 kcompactd+0x762/0xea0 mm/compaction.c:3227
 kthread+0x3a4/0x760 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 8620:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4138 [inline]
 slab_alloc_node mm/slub.c:4187 [inline]
 kmem_cache_alloc_lru_noprof+0x1d0/0x3b0 mm/slub.c:4206
 shmem_alloc_inode+0x25/0x50 mm/shmem.c:5160
 alloc_inode+0x61/0x240 fs/inode.c:346
 new_inode+0x22/0x1c0 fs/inode.c:1145
 __shmem_get_inode mm/shmem.c:3058 [inline]
 shmem_get_inode+0x19a/0xfb0 mm/shmem.c:3132
 shmem_symlink+0xf7/0x780 mm/shmem.c:4107
 vfs_symlink fs/namei.c:4688 [inline]
 vfs_symlink+0x400/0x680 fs/namei.c:4672
 do_symlinkat+0x261/0x310 fs/namei.c:4714
 __do_sys_symlinkat fs/namei.c:4730 [inline]
 __se_sys_symlinkat fs/namei.c:4727 [inline]
 __ia32_sys_symlinkat+0x93/0xc0 fs/namei.c:4727
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 33:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2376 [inline]
 slab_free mm/slub.c:4633 [inline]
 kmem_cache_free+0x2d4/0x4d0 mm/slub.c:4735
 i_callback+0x43/0x70 fs/inode.c:325
 rcu_do_batch kernel/rcu/tree.c:2568 [inline]
 rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2824
 handle_softirqs+0x216/0x8e0 kernel/softirq.c:561
 run_ksoftirqd kernel/softirq.c:950 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:942
 smpboot_thread_fn+0x678/0xa70 kernel/smpboot.c:164
 kthread+0x3a4/0x760 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
 __call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
 destroy_inode+0x12c/0x1b0 fs/inode.c:401
 evict+0x5b4/0x920 fs/inode.c:834
 iput_final fs/inode.c:1898 [inline]
 iput fs/inode.c:1924 [inline]
 iput+0x521/0x880 fs/inode.c:1910
 do_unlinkat+0x518/0x6a0 fs/namei.c:4615
 __do_sys_unlink fs/namei.c:4654 [inline]
 __se_sys_unlink fs/namei.c:4652 [inline]
 __ia32_sys_unlink+0xc4/0x110 fs/namei.c:4652
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff888023670d10
 which belongs to the cache shmem_inode_cache of size 1544
The buggy address is located 1224 bytes inside of
 freed 1544-byte region [ffff888023670d10, ffff888023671318)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23670
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888025cbef01
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff888040491cc0 ffffea00010d9000 dead000000000003
raw: 0000000000000000 0000000000130013 00000000f5000000 ffff888025cbef01
head: 00fff00000000040 ffff888040491cc0 ffffea00010d9000 dead000000000003
head: 0000000000000000 0000000000130013 00000000f5000000 ffff888025cbef01
head: 00fff00000000003 ffffea00008d9c01 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
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 36, tgid 36 (kdevtmpfs), ts 6534445964, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x10c4/0x34c0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x223/0x24d0 mm/page_alloc.c:4740
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2446 [inline]
 allocate_slab mm/slub.c:2610 [inline]
 new_slab+0x23c/0x330 mm/slub.c:2663
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3849
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3939
 __slab_alloc_node mm/slub.c:4014 [inline]
 slab_alloc_node mm/slub.c:4175 [inline]
 kmem_cache_alloc_lru_noprof+0xf4/0x3b0 mm/slub.c:4206
 shmem_alloc_inode+0x25/0x50 mm/shmem.c:5160
 alloc_inode+0x61/0x240 fs/inode.c:346
 new_inode+0x22/0x1c0 fs/inode.c:1145
 __shmem_get_inode mm/shmem.c:3058 [inline]
 shmem_get_inode+0x19a/0xfb0 mm/shmem.c:3132
 shmem_mknod+0x1a8/0x450 mm/shmem.c:3854
 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4193
 handle_create drivers/base/devtmpfs.c:233 [inline]
 handle drivers/base/devtmpfs.c:393 [inline]
 devtmpfs_work_loop+0x1c8/0x8e0 drivers/base/devtmpfs.c:408
 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:450
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888023671080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023671100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888023671180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff888023671200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023671280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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