loop0: detected capacity change from 0 to 32768
(syz.0.0,5318,0):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0xb3775c19, computed 0x2dd1c265. Applying ECC.
(syz.0.0,5318,0):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0xb3775c19, computed 0x2dd1c265. Applying ECC.
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: slab-use-after-free in ocfs2_fault+0xd3/0x3f0 fs/ocfs2/mmap.c:41
Read of size 8 at addr ffff888011284918 by task syz.0.0/5318

CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.15.0-rc7-syzkaller #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_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xb4/0x290 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 ocfs2_fault+0xd3/0x3f0 fs/ocfs2/mmap.c:41
 __do_fault+0x135/0x390 mm/memory.c:5098
 do_read_fault mm/memory.c:5518 [inline]
 do_fault mm/memory.c:5652 [inline]
 do_pte_missing mm/memory.c:4160 [inline]
 handle_pte_fault mm/memory.c:5997 [inline]
 __handle_mm_fault+0x363e/0x5380 mm/memory.c:6140
 handle_mm_fault+0x3f6/0x8c0 mm/memory.c:6309
 faultin_page mm/gup.c:1193 [inline]
 __get_user_pages+0x16f0/0x2a40 mm/gup.c:1491
 populate_vma_page_range+0x26b/0x340 mm/gup.c:1929
 __mm_populate+0x24c/0x380 mm/gup.c:2032
 mm_populate include/linux/mm.h:3487 [inline]
 vm_mmap_pgoff+0x3f0/0x4c0 mm/util.c:584
 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f780138e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7802228038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f78015b5fa0 RCX: 00007f780138e969
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f7801410ab1 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f78015b5fa0 R15: 00007ffebc3a75f8
 </TASK>

Allocated by task 5318:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4147 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203
 vm_area_alloc+0x24/0x140 kernel/fork.c:441
 __mmap_new_vma mm/vma.c:2402 [inline]
 __mmap_region mm/vma.c:2519 [inline]
 mmap_region+0xcf4/0x1e50 mm/vma.c:2597
 do_mmap+0xc68/0x1100 mm/mmap.c:561
 vm_mmap_pgoff+0x31b/0x4c0 mm/util.c:579
 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 4685:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2380 [inline]
 slab_free_after_rcu_debug+0x127/0x290 mm/slub.c:4692
 rcu_do_batch kernel/rcu/tree.c:2568 [inline]
 rcu_core+0xca8/0x1710 kernel/rcu/tree.c:2824
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 do_softirq+0xec/0x180 kernel/softirq.c:480
 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline]
 kernel_fpu_end+0xd2/0x120 arch/x86/kernel/fpu/core.c:460
 crc32c_arch+0x71/0x240 arch/x86/lib/crc32-glue.c:52
 crc32c include/linux/crc32.h:35 [inline]
 jbd2_chksum include/linux/jbd2.h:1772 [inline]
 jbd2_commit_block_csum_set fs/jbd2/commit.c:102 [inline]
 journal_submit_commit_record+0x47f/0x8b0 fs/jbd2/commit.c:144
 jbd2_journal_commit_transaction+0x33a0/0x5960 fs/jbd2/commit.c:875
 kjournald2+0x3cf/0x750 fs/jbd2/journal.c:201
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/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+0x3e/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548
 slab_free_hook mm/slub.c:2341 [inline]
 slab_free mm/slub.c:4642 [inline]
 kmem_cache_free+0x2ee/0x3f0 mm/slub.c:4744
 remove_vma mm/vma.c:430 [inline]
 vms_complete_munmap_vmas+0x626/0x8a0 mm/vma.c:1249
 __mmap_complete mm/vma.c:2469 [inline]
 __mmap_region mm/vma.c:2535 [inline]
 mmap_region+0x1471/0x1e50 mm/vma.c:2597
 do_mmap+0xc68/0x1100 mm/mmap.c:561
 vm_mmap_pgoff+0x31b/0x4c0 mm/util.c:579
 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880112848c0
 which belongs to the cache vm_area_struct of size 256
The buggy address is located 88 bytes inside of
 freed 256-byte region [ffff8880112848c0, ffff8880112849c0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11284
memcg:ffff888000a5c381
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b2cdb40 ffffea00007da280 dead000000000005
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff888000a5c381
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4707, tgid 4707 (acpid), ts 24962764634, free_ts 24305900493
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1714
 prep_new_page mm/page_alloc.c:1722 [inline]
 get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3684
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4966
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2450 [inline]
 allocate_slab+0x8a/0x3b0 mm/slub.c:2618
 new_slab mm/slub.c:2672 [inline]
 ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
 __slab_alloc mm/slub.c:3948 [inline]
 __slab_alloc_node mm/slub.c:4023 [inline]
 slab_alloc_node mm/slub.c:4184 [inline]
 kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4203
 vm_area_dup+0x28/0x540 kernel/fork.c:488
 dup_mmap kernel/fork.c:668 [inline]
 dup_mm kernel/fork.c:1735 [inline]
 copy_mm+0xbda/0x2160 kernel/fork.c:1787
 copy_process+0x16d3/0x3b80 kernel/fork.c:2430
 kernel_clone+0x21e/0x870 kernel/fork.c:2845
 __do_sys_clone kernel/fork.c:2988 [inline]
 __se_sys_clone kernel/fork.c:2972 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2972
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1258 [inline]
 __free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2721
 __free_pages mm/page_alloc.c:5078 [inline]
 free_reserved_page+0xce/0x120 mm/page_alloc.c:5981
 free_reserved_area+0x4d/0xf0 mm/page_alloc.c:5967
 free_init_pages arch/x86/mm/init.c:937 [inline]
 free_kernel_image_pages+0xa2/0x100 arch/x86/mm/init.c:953
 kernel_init+0x31/0x1d0 init/main.c:1466
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888011284800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888011284880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888011284900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888011284980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888011284a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================