loop2: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common+0x100/0x21a0 kernel/locking/mutex.c:587 Read of size 8 at addr ffff0000d29614b0 by task syz-executor126/6493 CPU: 0 UID: 0 PID: 6493 Comm: syz-executor126 Not tainted 6.11.0-rc5-syzkaller-gdf54f4a16f82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:119 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_nested+0x2c/0x38 kernel/locking/mutex.c:804 dbFreeBits+0x734/0xc0c fs/jfs/jfs_dmap.c:2390 dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline] dbFree+0x2d4/0x5b0 fs/jfs/jfs_dmap.c:409 dbDiscardAG+0x604/0x748 fs/jfs/jfs_dmap.c:1650 jfs_ioc_trim+0x3cc/0x5d8 fs/jfs/jfs_discard.c:100 jfs_ioctl+0x338/0x550 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:893 __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:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Allocated by task 6493: 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:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __kmalloc_cache_noprof+0x244/0x374 mm/slub.c:4189 kmalloc_noprof include/linux/slab.h:681 [inline] dbMount+0x68/0x810 fs/jfs/jfs_dmap.c:164 jfs_mount+0x1c8/0x7a8 fs/jfs/jfs_mount.c:121 jfs_fill_super+0x464/0x9f0 fs/jfs/super.c:556 mount_bdev+0x1d4/0x2a0 fs/super.c:1679 jfs_do_mount+0x44/0x58 fs/jfs/super.c:670 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x28c fs/super.c:1800 do_new_mount+0x278/0x900 fs/namespace.c:3472 path_mount+0x590/0xe04 fs/namespace.c:3799 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount fs/namespace.c:3997 [inline] __arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:3997 __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:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 6507: 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+0x128/0x180 mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x154/0x3e0 mm/slub.c:4594 dbUnmount+0xfc/0x168 fs/jfs/jfs_dmap.c:278 jfs_mount_rw+0x3d0/0x5b8 fs/jfs/jfs_mount.c:247 jfs_remount+0x328/0x594 fs/jfs/super.c:454 legacy_reconfigure+0xfc/0x114 fs/fs_context.c:685 reconfigure_super+0x1d0/0x6f0 fs/super.c:1083 do_remount fs/namespace.c:3012 [inline] path_mount+0xc0c/0xe04 fs/namespace.c:3791 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount fs/namespace.c:3997 [inline] __arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:3997 __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:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000d2961000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1200 bytes inside of freed 2048-byte region [ffff0000d2961000, ffff0000d2961800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112960 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 05ffc00000000040 ffff0000c0002000 fffffdffc34eca00 0000000000000002 raw: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 fffffdffc34eca00 0000000000000002 head: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000 head: 05ffc00000000003 fffffdffc34a5801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d2961380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d2961400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d2961480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d2961500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d2961580: fb fb fb fb fb fb fb fb 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