==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common+0x100/0x21a0 kernel/locking/mutex.c:587
Read of size 8 at addr ffff0000c41f6130 by task jffs2_gcd_mtd0/6740

CPU: 0 UID: 0 PID: 6740 Comm: jffs2_gcd_mtd0 Tainted: G        W          6.12.0-rc3-syzkaller-gc7e6f5e2fb8d #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (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:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 __mutex_lock_common+0x100/0x21a0 kernel/locking/mutex.c:587
 __mutex_lock kernel/locking/mutex.c:752 [inline]
 mutex_lock_interruptible_nested+0x2c/0x38 kernel/locking/mutex.c:826
 jffs2_garbage_collect_pass+0xa4/0x1a50 fs/jffs2/gc.c:134
 jffs2_garbage_collect_thread+0x410/0x488 fs/jffs2/background.c:155
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Allocated by task 6739:
 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:565
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __kmalloc_cache_noprof+0x244/0x378 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 jffs2_init_fs_context+0x58/0xc8 fs/jffs2/super.c:314
 alloc_fs_context+0x514/0x7a4 fs/fs_context.c:318
 fs_context_for_mount+0x34/0x44 fs/fs_context.c:332
 do_new_mount+0x14c/0x900 fs/namespace.c:3486
 path_mount+0x590/0xe04 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount fs/namespace.c:4032 [inline]
 __arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:4032
 __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 6631:
 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:579
 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:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x184/0x47c mm/slub.c:4727
 jffs2_kill_sb+0x9c/0xb0 fs/jffs2/super.c:351
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380
 task_work_run+0x230/0x2e0 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745
 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 ffff0000c41f6000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 304 bytes inside of
 freed 4096-byte region [ffff0000c41f6000, ffff0000c41f7000)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1041f0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0002140 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0002140 0000000000000000 dead000000000001
head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc3107c01 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c41f6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c41f6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000c41f6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000c41f6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000c41f6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address 00778055600003ba
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[00778055600003ba] address between user and kernel address ranges