==================================================================
BUG: KASAN: slab-out-of-bounds in diWrite+0x1209/0x1f40 fs/jfs/jfs_imap.c:753
Write of size 32 at addr ffff88804d52c320 by task syz.9.81/6606

CPU: 1 UID: 0 PID: 6606 Comm: syz.9.81 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 diWrite+0x1209/0x1f40 fs/jfs/jfs_imap.c:753
 txCommit+0x852/0x5430 fs/jfs/jfs_txnmgr.c:1255
 add_missing_indices+0x8ce/0xce0 fs/jfs/jfs_dtree.c:2674
 jfs_readdir+0x1d92/0x3ae0 fs/jfs/jfs_dtree.c:3031
 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:65
 iterate_dir+0x3a2/0x580 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0xe4/0x250 fs/readdir.c:312
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e04dbebe9
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:00007f6e03005038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f6e04ff6090 RCX: 00007f6e04dbebe9
RDX: 0000000020002078 RSI: 0000200000001fc0 RDI: 0000000000000007
RBP: 00007f6e04e41e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6e04ff6128 R14: 00007f6e04ff6090 R15: 00007ffd07f3c1d8
 </TASK>

Allocated by task 6170:
 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:330 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_noprof+0x143/0x310 mm/slub.c:4236
 lsm_inode_alloc security/security.c:755 [inline]
 security_inode_alloc+0x39/0x330 security/security.c:1697
 inode_init_always_gfp+0x9bf/0xd70 fs/inode.c:306
 inode_init_always include/linux/fs.h:3308 [inline]
 alloc_inode+0x82/0x1b0 fs/inode.c:353
 new_inode+0x22/0x170 fs/inode.c:1145
 debugfs_get_inode fs/debugfs/inode.c:72 [inline]
 __debugfs_create_file+0x14d/0x4f0 fs/debugfs/inode.c:441
 debugfs_create_file_unsafe+0x3a/0x50 fs/debugfs/inode.c:517
 nsim_udp_tunnels_info_create+0x1fa/0x640 drivers/net/netdevsim/udp_tunnels.c:150
 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1018 [inline]
 nsim_create+0x7c8/0xf20 drivers/net/netdevsim/netdev.c:1105
 __nsim_dev_port_add+0x6b6/0xb10 drivers/net/netdevsim/dev.c:1438
 nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1494
 nsim_drv_probe+0x884/0xba0 drivers/net/netdevsim/dev.c:1653
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26a/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x254/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2bb/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x188/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 nsim_bus_dev_new drivers/net/netdevsim/bus.c:463 [inline]
 new_device_store+0x36c/0x6f0 drivers/net/netdevsim/bus.c:191
 kernfs_fop_write_iter+0x379/0x4f0 fs/kernfs/file.c:334
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5d2/0xb40 fs/read_write.c:686
 ksys_write+0x14b/0x260 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88804d52c2c0
 which belongs to the cache lsm_inode_cache of size 112
The buggy address is located 96 bytes inside of
 allocated 112-byte region [ffff88804d52c2c0, ffff88804d52c330)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88804d52c4d0 pfn:0x4d52c
flags: 0x80000000000200(workingset|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000200 ffff88801aed0280 ffffea0001410050 ffffea0000bdc550
raw: ffff88804d52c4d0 0000000000170013 00000000f5000000 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6170, tgid 6170 (syz-executor), ts 155502100856, free_ts 131323706495
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2119/0x21b0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0x8a/0x370 mm/slub.c:2655
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0x8d1/0xdd0 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 kmem_cache_alloc_noprof+0xe6/0x310 mm/slub.c:4236
 lsm_inode_alloc security/security.c:755 [inline]
 security_inode_alloc+0x39/0x330 security/security.c:1697
 inode_init_always_gfp+0x9bf/0xd70 fs/inode.c:306
 inode_init_always include/linux/fs.h:3308 [inline]
 alloc_inode+0x82/0x1b0 fs/inode.c:353
 new_inode+0x22/0x170 fs/inode.c:1145
 debugfs_get_inode fs/debugfs/inode.c:72 [inline]
 __debugfs_create_file+0x14d/0x4f0 fs/debugfs/inode.c:441
 debugfs_create_file_unsafe+0x3a/0x50 fs/debugfs/inode.c:517
 nsim_ethtool_init+0x353/0x4d0 drivers/net/netdevsim/ethtool.c:246
 nsim_create+0x245/0xf20 drivers/net/netdevsim/netdev.c:1103
 __nsim_dev_port_add+0x6b6/0xb10 drivers/net/netdevsim/dev.c:1438
page last free pid 5838 tgid 5838 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_pages_ok+0xa3e/0xba0 mm/page_alloc.c:1571
 __free_frozen_pages+0x11e/0xce0 mm/page_alloc.c:2891
 free_large_kmalloc+0x13a/0x1f0 mm/slub.c:4805
 bch2_dev_journal_exit+0x27b/0x4a0 fs/bcachefs/journal.c:1593
 bch2_dev_free+0x342/0x480 fs/bcachefs/super.c:1388
 bch2_fs_free+0x440/0x5a0 fs/bcachefs/super.c:728
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d52c200: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804d52c280: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
>ffff88804d52c300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00
                                     ^
 ffff88804d52c380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff88804d52c400: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================