loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-use-after-free in diWrite+0xb48/0x15cc fs/jfs/jfs_imap.c:753 Write of size 32 at addr ffff0000c7e910c0 by task syz.0.16/6992 CPU: 0 UID: 0 PID: 6992 Comm: syz.0.16 Not tainted 6.14.0-rc7-syzkaller-00205-g586de92313fc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x178/0x530 mm/kasan/report.c:521 kasan_report+0xd8/0x138 mm/kasan/report.c:634 kasan_check_range+0x254/0x294 mm/kasan/generic.c:189 __asan_memcpy+0x54/0x84 mm/kasan/shadow.c:106 diWrite+0xb48/0x15cc fs/jfs/jfs_imap.c:753 txCommit+0x750/0x5504 fs/jfs/jfs_txnmgr.c:1255 add_missing_indices+0x760/0xa8c fs/jfs/jfs_dtree.c:2663 jfs_readdir+0x18ac/0x3030 fs/jfs/jfs_dtree.c:3019 wrap_directory_iterator+0xa8/0xf4 fs/readdir.c:65 shared_jfs_readdir+0x30/0x40 fs/jfs/namei.c:1540 iterate_dir+0x46c/0x5f4 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64 fs/readdir.c:389 [inline] __arm64_sys_getdents64+0x1c0/0x490 fs/readdir.c:389 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Allocated by task 6965: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x254/0x410 mm/slub.c:4171 anon_vma_alloc mm/rmap.c:94 [inline] anon_vma_fork+0xdc/0x478 mm/rmap.c:360 dup_mmap kernel/fork.c:711 [inline] dup_mm kernel/fork.c:1700 [inline] copy_mm+0xbac/0x1cc0 kernel/fork.c:1752 copy_process+0x1568/0x3250 kernel/fork.c:2403 kernel_clone+0x1d8/0x870 kernel/fork.c:2815 __do_sys_clone kernel/fork.c:2958 [inline] __se_sys_clone kernel/fork.c:2926 [inline] __arm64_sys_clone+0x1f8/0x270 kernel/fork.c:2926 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 17: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free_after_rcu_debug+0x11c/0x2f8 mm/slub.c:4659 rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0x898/0x1b60 kernel/rcu/tree.c:2802 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2819 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 run_ksoftirqd+0x70/0xc0 kernel/softirq.c:950 smpboot_thread_fn+0x4b0/0x90c kernel/smpboot.c:164 kthread+0x5f8/0x744 kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 kasan_record_aux_stack+0xb4/0xcc mm/kasan/generic.c:548 slab_free_hook mm/slub.c:2314 [inline] slab_free mm/slub.c:4609 [inline] kmem_cache_free+0x368/0x554 mm/slub.c:4711 anon_vma_free mm/rmap.c:137 [inline] __put_anon_vma+0x120/0x2d0 mm/rmap.c:2568 put_anon_vma include/linux/rmap.h:116 [inline] unlink_anon_vmas+0x3dc/0x520 mm/rmap.c:444 free_pgtables+0x458/0x6f0 mm/memory.c:407 exit_mmap+0x43c/0xda0 mm/mmap.c:1295 __mmput+0xec/0x3e4 kernel/fork.c:1356 mmput+0x70/0xac kernel/fork.c:1378 exec_mmap+0x57c/0x69c fs/exec.c:1011 begin_new_exec+0x698/0x1228 fs/exec.c:1267 load_elf_binary+0x710/0x1cb0 fs/binfmt_elf.c:1002 search_binary_handler fs/exec.c:1775 [inline] exec_binprm fs/exec.c:1807 [inline] bprm_execve+0x7ec/0x11fc fs/exec.c:1859 do_execveat_common+0x6f0/0x880 fs/exec.c:1966 do_execve fs/exec.c:2040 [inline] __do_sys_execve fs/exec.c:2116 [inline] __se_sys_execve fs/exec.c:2111 [inline] __arm64_sys_execve+0x98/0xb0 fs/exec.c:2111 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000c7e91000 which belongs to the cache anon_vma of size 208 The buggy address is located 192 bytes inside of freed 208-byte region [ffff0000c7e91000, ffff0000c7e910d0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107e91 anon flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c1899140 0000000000000000 0000000000000001 raw: 0000000000000000 00000000000f000f 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c7e90f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000c7e91000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c7e91080: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ^ ffff0000c7e91100: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c7e91180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 0 ERROR: (device loop0): remounting filesystem as read-only