do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
==================================================================
BUG: KASAN: use-after-free in sanity_check_inode fs/f2fs/inode.c:282 [inline]
BUG: KASAN: use-after-free in do_read_inode fs/f2fs/inode.c:422 [inline]
BUG: KASAN: use-after-free in f2fs_iget+0x4224/0x5110 fs/f2fs/inode.c:521
Read of size 4 at addr ffff0000d012ca50 by task syz-executor.2/4811

CPU: 1 PID: 4811 Comm: syz-executor.2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x0/0x458 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x158 mm/kasan/report.c:451
 __asan_report_load4_noabort+0x44/0x50 mm/kasan/report_generic.c:308
 sanity_check_inode fs/f2fs/inode.c:282 [inline]
 do_read_inode fs/f2fs/inode.c:422 [inline]
 f2fs_iget+0x4224/0x5110 fs/f2fs/inode.c:521
 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3114
 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044
 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3128
 exportfs_decode_fh_raw+0x13c/0x4e8 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x530/0x924 fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4760:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x74/0x3f8 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x1d8/0x3d4 mm/slub.c:3238
 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2628 [inline]
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2638 [inline]
 __grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
 __f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
 f2fs_init_extent_tree+0x43c/0xa94 fs/f2fs/extent_cache.c:404
 do_read_inode fs/f2fs/inode.c:399 [inline]
 f2fs_iget+0x10c0/0x5110 fs/f2fs/inode.c:521
 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3114
 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044
 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3128
 exportfs_decode_fh_raw+0x13c/0x4e8 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x530/0x924 fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Freed by task 4760:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0x128/0x1e4 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0xdc/0x3b0 mm/slub.c:3520
 f2fs_destroy_extent_tree+0x2d0/0x674 fs/f2fs/extent_cache.c:845
 f2fs_evict_inode+0x32c/0x1538 fs/f2fs/inode.c:776
 evict+0x3e0/0x828 fs/inode.c:647
 iput_final fs/inode.c:1769 [inline]
 iput+0x6ac/0x764 fs/inode.c:1795
 iget_failed+0x148/0x194 fs/bad_inode.c:250
 f2fs_iget+0x58c/0x5110 fs/f2fs/inode.c:573
 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3114
 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044
 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3128
 exportfs_decode_fh_raw+0x13c/0x4e8 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x530/0x924 fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000d012ca28
 which belongs to the cache f2fs_extent_tree of size 136
The buggy address is located 40 bytes inside of
 136-byte region [ffff0000d012ca28, ffff0000d012cab0)
The buggy address belongs to the page:
page:000000002cb470bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11012c
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c6989800
raw: 0000000000000000 0000000080140014 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d012c900: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
 ffff0000d012c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
>ffff0000d012ca00: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff0000d012ca80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
 ffff0000d012cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
F2FS-fs (loop2): sanity_check_inode: inode (ino=8) extent info [5634, 0, 3] is incorrect, run fsck to fix
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3504 [inline]
BUG: KASAN: double-free or invalid-free in kmem_cache_free+0xdc/0x3b0 mm/slub.c:3520

CPU: 1 PID: 4811 Comm: syz-executor.2 Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x0/0x458 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 kasan_report_invalid_free+0x4c/0x7c mm/kasan/report.c:373
 ____kasan_slab_free+0x134/0x164 mm/kasan/common.c:-1
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0x128/0x1e4 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0xdc/0x3b0 mm/slub.c:3520
 f2fs_destroy_extent_tree+0x2d0/0x674 fs/f2fs/extent_cache.c:845
 f2fs_evict_inode+0x32c/0x1538 fs/f2fs/inode.c:776
 evict+0x3e0/0x828 fs/inode.c:647
 iput_final fs/inode.c:1769 [inline]
 iput+0x6ac/0x764 fs/inode.c:1795
 iget_failed+0x148/0x194 fs/bad_inode.c:250
 f2fs_iget+0x58c/0x5110 fs/f2fs/inode.c:573
 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3114
 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044
 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3128
 exportfs_decode_fh_raw+0x13c/0x4e8 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x530/0x924 fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4760:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x74/0x3f8 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x1d8/0x3d4 mm/slub.c:3238
 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2628 [inline]
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2638 [inline]
 __grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
 __f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
 f2fs_init_extent_tree+0x43c/0xa94 fs/f2fs/extent_cache.c:404
 do_read_inode fs/f2fs/inode.c:399 [inline]
 f2fs_iget+0x10c0/0x5110 fs/f2fs/inode.c:521
 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3114
 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044
 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3128
 exportfs_decode_fh_raw+0x13c/0x4e8 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x530/0x924 fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Freed by task 4760:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0x128/0x1e4 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kmem_cache_free+0xdc/0x3b0 mm/slub.c:3520
 f2fs_destroy_extent_tree+0x2d0/0x674 fs/f2fs/extent_cache.c:845
 f2fs_evict_inode+0x32c/0x1538 fs/f2fs/inode.c:776
 evict+0x3e0/0x828 fs/inode.c:647
 iput_final fs/inode.c:1769 [inline]
 iput+0x6ac/0x764 fs/inode.c:1795
 iget_failed+0x148/0x194 fs/bad_inode.c:250
 f2fs_iget+0x58c/0x5110 fs/f2fs/inode.c:573
 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3114
 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044
 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3128
 exportfs_decode_fh_raw+0x13c/0x4e8 fs/exportfs/expfs.c:436
 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x530/0x924 fs/fhandle.c:223
 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline]
 __se_sys_open_by_handle_at fs/fhandle.c:256 [inline]
 __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000d012ca28
 which belongs to the cache f2fs_extent_tree of size 136
The buggy address is located 0 bytes inside of
 136-byte region [ffff0000d012ca28, ffff0000d012cab0)
The buggy address belongs to the page:
page:000000002cb470bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11012c
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c6989800
raw: 0000000000000000 0000000080140014 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d012c900: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
 ffff0000d012c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
>ffff0000d012ca00: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff0000d012ca80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
 ffff0000d012cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================