===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:131 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:30 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:302 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:330 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xef3/0x3400 lib/iov_iter.c:197 instrument_copy_to_user include/linux/instrumented.h:131 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0xef3/0x3400 lib/iov_iter.c:197 copy_page_to_iter+0x482/0x900 lib/iov_iter.c:374 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x1cd6/0x2300 mm/filemap.c:2851 blkdev_read_iter+0x89f/0xb00 block/fops.c:856 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x8ec/0xf90 fs/read_write.c:574 ksys_read+0x1d9/0x470 fs/read_write.c:717 __do_sys_read fs/read_write.c:726 [inline] __se_sys_read fs/read_write.c:724 [inline] __x64_sys_read+0x97/0xf0 fs/read_write.c:724 x64_sys_call+0x311c/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:1 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 Uninit was stored to memory at: memcpy_to_iter lib/iov_iter.c:77 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0x130f/0x3400 lib/iov_iter.c:197 copy_page_to_iter+0x482/0x900 lib/iov_iter.c:374 copy_folio_to_iter include/linux/uio.h:204 [inline] shmem_file_read_iter+0x904/0x1140 mm/shmem.c:3449 lo_rw_aio+0x1164/0x14a0 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1926 [inline] loop_process_work+0xf05/0x1ff0 drivers/block/loop.c:1961 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1992 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3358 worker_thread+0xede/0x1580 kernel/workqueue.c:3439 kthread+0x53f/0x600 kernel/kthread.c:467 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: memcpy_from_iter lib/iov_iter.c:85 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:261 [inline] copy_folio_from_iter_atomic+0xea0/0x38b0 lib/iov_iter.c:491 generic_perform_write+0x8b7/0x1050 mm/filemap.c:4332 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3501 lo_rw_aio+0x1164/0x14a0 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1926 [inline] loop_process_work+0xf05/0x1ff0 drivers/block/loop.c:1961 loop_workfn+0x3e/0x60 drivers/block/loop.c:1985 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3358 worker_thread+0xede/0x1580 kernel/workqueue.c:3439 kthread+0x53f/0x600 kernel/kthread.c:467 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: xlog_write_iovec fs/xfs/xfs_log.c:1911 [inline] xlog_write_full fs/xfs/xfs_log.c:1938 [inline] xlog_write+0x1a75/0x20f0 fs/xfs/xfs_log.c:2178 xlog_cil_write_chain fs/xfs/xfs_log_cil.c:1175 [inline] xlog_cil_push_work+0x3533/0x5030 fs/xfs/xfs_log_cil.c:1518 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3358 worker_thread+0xede/0x1580 kernel/workqueue.c:3439 kthread+0x53f/0x600 kernel/kthread.c:467 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: xlog_format_copy fs/xfs/xfs_log.h:78 [inline] xfs_inode_item_format_attr_fork+0x6f1/0xa80 fs/xfs/xfs_inode_item.c:455 xfs_inode_item_format+0x2024/0x2280 fs/xfs/xfs_inode_item.c:674 xlog_cil_insert_format_items fs/xfs/xfs_log_cil.c:603 [inline] xlog_cil_insert_items fs/xfs/xfs_log_cil.c:654 [inline] xlog_cil_commit+0x17f8/0x4760 fs/xfs/xfs_log_cil.c:1841 __xfs_trans_commit+0x556/0xf20 fs/xfs/xfs_trans.c:868 xfs_trans_roll+0xfd/0x600 fs/xfs/xfs_trans.c:1031 xfs_defer_trans_roll+0x106/0x520 fs/xfs/libxfs/xfs_defer.c:479 xfs_defer_finish_noroll+0xce3/0x1d80 fs/xfs/libxfs/xfs_defer.c:688 xfs_trans_commit+0x165/0x270 fs/xfs/xfs_trans.c:919 xfs_attr_set+0x1da1/0x2030 fs/xfs/libxfs/xfs_attr.c:1244 xfs_attr_change+0x408/0x5b0 fs/xfs/xfs_xattr.c:128 xfs_xattr_set+0x1d4/0x2f0 fs/xfs/xfs_xattr.c:186 __vfs_setxattr+0x742/0x840 fs/xattr.c:200 __vfs_setxattr_noperm+0x224/0xad0 fs/xattr.c:234 __vfs_setxattr_locked+0x1f8/0x510 fs/xattr.c:295 vfs_setxattr+0x276/0x690 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x396/0xcb0 fs/xattr.c:664 path_setxattrat+0x702/0x800 fs/xattr.c:708 __do_sys_lsetxattr fs/xattr.c:749 [inline] __se_sys_lsetxattr fs/xattr.c:745 [inline] __x64_sys_lsetxattr+0x103/0x1c0 fs/xattr.c:745 x64_sys_call+0x168d/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:190 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 Uninit was created at: slab_post_alloc_hook mm/slub.c:4466 [inline] slab_alloc_node mm/slub.c:4788 [inline] __do_kmalloc_node mm/slub.c:5176 [inline] __kmalloc_node_track_caller_noprof+0x4ff/0x1710 mm/slub.c:5285 __do_krealloc mm/slub.c:6546 [inline] krealloc_node_align_noprof+0x463/0xf10 mm/slub.c:6605 xfs_broot_realloc+0x361/0x480 fs/xfs/libxfs/xfs_inode_fork.c:431 xfs_bmap_broot_realloc+0x243/0x650 fs/xfs/libxfs/xfs_bmap_btree.c:-1 xfs_bmap_extents_to_btree+0x1f8/0x1430 fs/xfs/libxfs/xfs_bmap.c:660 xfs_bmap_add_extent_hole_real+0x2267/0x3040 fs/xfs/libxfs/xfs_bmap.c:2791 xfs_bmapi_allocate+0x48d2/0x4f50 fs/xfs/libxfs/xfs_bmap.c:3977 xfs_bmapi_write+0x10a9/0x26f0 fs/xfs/libxfs/xfs_bmap.c:4267 xfs_attr_rmtval_set_blk+0x171/0x390 fs/xfs/libxfs/xfs_attr_remote.c:640 xfs_attr_rmtval_alloc fs/xfs/libxfs/xfs_attr.c:633 [inline] xfs_attr_set_iter+0x35f/0x7980 fs/xfs/libxfs/xfs_attr.c:862 xfs_attr_finish_item+0x16c/0x540 fs/xfs/xfs_attr_item.c:503 xfs_defer_finish_one+0x528/0x13c0 fs/xfs/libxfs/xfs_defer.c:595 xfs_defer_finish_noroll+0x1064/0x1d80 fs/xfs/libxfs/xfs_defer.c:707 xfs_trans_commit+0x165/0x270 fs/xfs/xfs_trans.c:919 xfs_attr_set+0x1da1/0x2030 fs/xfs/libxfs/xfs_attr.c:1244 xfs_attr_change+0x408/0x5b0 fs/xfs/xfs_xattr.c:128 xfs_xattr_set+0x1d4/0x2f0 fs/xfs/xfs_xattr.c:186 __vfs_setxattr+0x742/0x840 fs/xattr.c:200 __vfs_setxattr_noperm+0x224/0xad0 fs/xattr.c:234 __vfs_setxattr_locked+0x1f8/0x510 fs/xattr.c:295 vfs_setxattr+0x276/0x690 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x396/0xcb0 fs/xattr.c:664 path_setxattrat+0x702/0x800 fs/xattr.c:708 __do_sys_lsetxattr fs/xattr.c:749 [inline] __se_sys_lsetxattr fs/xattr.c:745 [inline] __x64_sys_lsetxattr+0x103/0x1c0 fs/xattr.c:745 x64_sys_call+0x168d/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:190 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 Bytes 1588-1591 of 4096 are uninitialized Memory access of size 4096 starts at ffff888053f85000 Data copied to user address 00007fc19855f000 CPU: 0 UID: 0 PID: 6227 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 =====================================================