REISERFS (device loop3): journal params: device ram0, size 127, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
REISERFS (device loop3): checking transaction log (ram0)
==================================================================
BUG: KASAN: use-after-free in init_inode fs/reiserfs/inode.c:1314 [inline]
BUG: KASAN: use-after-free in reiserfs_read_locked_inode+0x20db/0x29b0 fs/reiserfs/inode.c:1560
Read of size 4 at addr ffff88805cc49000 by task syz.3.105/5584

CPU: 0 UID: 0 PID: 5584 Comm: syz.3.105 Not tainted 6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 init_inode fs/reiserfs/inode.c:1314 [inline]
 reiserfs_read_locked_inode+0x20db/0x29b0 fs/reiserfs/inode.c:1560
 reiserfs_fill_super+0x1361/0x2640 fs/reiserfs/super.c:2070
 mount_bdev+0x20a/0x2d0 fs/super.c:1679
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d7ed7f79a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f4d7faa4e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4d7faa4ef0 RCX: 00007f4d7ed7f79a
RDX: 0000000020001100 RSI: 0000000020001140 RDI: 00007f4d7faa4eb0
RBP: 0000000020001100 R08: 00007f4d7faa4ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020001140
R13: 00007f4d7faa4eb0 R14: 00000000000010e8 R15: 0000000020001180
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:1 mapping:0000000000000000 index:0x7f41bdf02 pfn:0x5cc49
memcg:ffff88807a0a0000
anon flags: 0xfff00000020808(uptodate|owner_2|swapbacked|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000020808 0000000000000000 dead000000000122 ffff8880324dcbb1
raw: 00000007f41bdf02 0000000000000000 0000000200000000 ffff88807a0a0000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5599, tgid 5598 (syz.0.108), ts 78619809160, free_ts 78210294456
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3039/0x3180 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 folio_alloc_mpol_noprof mm/mempolicy.c:2283 [inline]
 vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2314
 folio_prealloc+0x31/0x170
 alloc_anon_folio mm/memory.c:4721 [inline]
 do_anonymous_page mm/memory.c:4778 [inline]
 do_pte_missing mm/memory.c:3963 [inline]
 handle_pte_fault+0x24dd/0x6800 mm/memory.c:5751
 __handle_mm_fault mm/memory.c:5894 [inline]
 handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6062
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 5236 tgid 5236 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_folios+0xee2/0x18a0 mm/page_alloc.c:2686
 folios_put_refs+0x76c/0x860 mm/swap.c:1007
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x64c/0x1cf0 mm/shmem.c:1032
 shmem_truncate_range mm/shmem.c:1144 [inline]
 shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1272
 evict+0x4e8/0x9b0 fs/inode.c:723
 __dentry_kill+0x20d/0x630 fs/dcache.c:615
 dput+0x19f/0x2b0 fs/dcache.c:857
 __fput+0x5d2/0x880 fs/file_table.c:439
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88805cc48f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805cc48f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88805cc49000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff88805cc49080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805cc49100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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