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+0x152d/0x17b0 fs/jfs/jfs_logmgr.c:1595
 jfs_umount+0x1e0/0x750 fs/jfs/jfs_umount.c:59
 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+0x505/0x2420 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x261/0x3c0 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+0x152d/0x17b0 fs/jfs/jfs_logmgr.c:1595
 jfs_umount+0x1e0/0x750 fs/jfs/jfs_umount.c:59
 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+0x505/0x2420 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x261/0x3c0 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:4577 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_noprof+0x373/0x1250 mm/slub.c:4906
 mempool_alloc_slab+0x36/0x50 mm/mempool.c:722
 mempool_alloc_noprof+0x19d/0x3c0 mm/mempool.c:566
 alloc_metapage fs/jfs/jfs_metapage.c:264 [inline]
 __get_metapage+0xa20/0x1840 fs/jfs/jfs_metapage.c:761
 diWrite+0x58f/0x2190 fs/jfs/jfs_imap.c:639
 txCommit+0xca6/0x92c0 fs/jfs/jfs_txnmgr.c:1257
 jfs_truncate_nolock+0x378/0x670 fs/jfs/inode.c:407
 jfs_truncate fs/jfs/inode.c:420 [inline]
 jfs_write_failed fs/jfs/inode.c:295 [inline]
 jfs_write_end+0x2c5/0x4c0 fs/jfs/inode.c:322
 generic_perform_write+0x99f/0x1050 mm/filemap.c:4346
 __generic_file_write_iter+0x213/0x460 mm/filemap.c:4442
 generic_file_write_iter+0x131/0x980 mm/filemap.c:4468
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0xbe1/0x15c0 fs/read_write.c:688
 ksys_pwrite64 fs/read_write.c:795 [inline]
 __do_sys_pwrite64 fs/read_write.c:803 [inline]
 __se_sys_pwrite64 fs/read_write.c:800 [inline]
 __x64_sys_pwrite64+0x2ab/0x3b0 fs/read_write.c:800
 x64_sys_call+0xbef/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:19
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 18678 Comm: syz-executor Tainted: G        W    L      syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================