jfs_flush_journal: synclist not empty
=====================================================
BUG: KMSAN: uninit-value in hex_dump_to_buffer+0xe86/0xeb0 lib/hexdump.c:172
 hex_dump_to_buffer+0xe86/0xeb0 lib/hexdump.c:172
 print_hex_dump+0x10d/0x330 lib/hexdump.c:277
 jfs_flush_journal+0x13e9/0x1670 fs/jfs/jfs_logmgr.c:1597
 jfs_umount+0x1e3/0x720 fs/jfs/jfs_umount.c:58
 jfs_put_super+0x112/0x3d0 fs/jfs/super.c:194
 generic_shutdown_super+0x1b8/0x4c0 fs/super.c:646
 kill_block_super+0x42/0xd0 fs/super.c:1725
 deactivate_locked_super+0xcb/0x3c0 fs/super.c:476
 deactivate_super+0x12f/0x140 fs/super.c:509
 cleanup_mnt+0x7eb/0x870 fs/namespace.c:1312
 __cleanup_mnt+0x22/0x30 fs/namespace.c:1319
 task_work_run+0x208/0x2b0 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x306/0x1b60 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x24d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 hex_dump_to_buffer+0xe7f/0xeb0 lib/hexdump.c:174
 print_hex_dump+0x10d/0x330 lib/hexdump.c:277
 jfs_flush_journal+0x13e9/0x1670 fs/jfs/jfs_logmgr.c:1597
 jfs_umount+0x1e3/0x720 fs/jfs/jfs_umount.c:58
 jfs_put_super+0x112/0x3d0 fs/jfs/super.c:194
 generic_shutdown_super+0x1b8/0x4c0 fs/super.c:646
 kill_block_super+0x42/0xd0 fs/super.c:1725
 deactivate_locked_super+0xcb/0x3c0 fs/super.c:476
 deactivate_super+0x12f/0x140 fs/super.c:509
 cleanup_mnt+0x7eb/0x870 fs/namespace.c:1312
 __cleanup_mnt+0x22/0x30 fs/namespace.c:1319
 task_work_run+0x208/0x2b0 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x306/0x1b60 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x24d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4466 [inline]
 slab_alloc_node mm/slub.c:4788 [inline]
 kmem_cache_alloc_noprof+0x37b/0x1270 mm/slub.c:4795
 mempool_alloc_slab+0x36/0x50 mm/mempool.c:723
 mempool_alloc_noprof+0x19d/0x3c0 mm/mempool.c:567
 alloc_metapage fs/jfs/jfs_metapage.c:264 [inline]
 __get_metapage+0xa20/0x1790 fs/jfs/jfs_metapage.c:760
 diNewExt+0x101f/0x3fd0 fs/jfs/jfs_imap.c:2275
 diAllocExt fs/jfs/jfs_imap.c:1952 [inline]
 diAllocAG+0x1373/0x31a0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x22e/0x33d0 fs/jfs/jfs_imap.c:1590
 ialloc+0xfc/0xe40 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x2a6/0x13a0 fs/jfs/namei.c:226
 vfs_mkdir+0x653/0x9f0 fs/namei.c:5233
 filename_mkdirat+0x42f/0xa60 fs/namei.c:5266
 __do_sys_mkdirat fs/namei.c:5287 [inline]
 __se_sys_mkdirat+0x82/0x330 fs/namei.c:5284
 __x64_sys_mkdirat+0x97/0xe0 fs/namei.c:5284
 x64_sys_call+0x37fc/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5784 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
=====================================================