=====================================================
BUG: KMSAN: uninit-value in LZ4_decompress_generic lib/lz4/lz4_decompress.c:148 [inline]
BUG: KMSAN: uninit-value in LZ4_decompress_safe_partial+0x825/0x1e50 lib/lz4/lz4_decompress.c:473
 LZ4_decompress_generic lib/lz4/lz4_decompress.c:148 [inline]
 LZ4_decompress_safe_partial+0x825/0x1e50 lib/lz4/lz4_decompress.c:473
 __bio_uncompress+0x503/0xa30 fs/bcachefs/compress.c:166
 bch2_bio_uncompress+0x4d9/0x800 fs/bcachefs/compress.c:283
 __bch2_read_endio+0x1b17/0x3070 fs/bcachefs/io_read.c:617
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4774
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2269
 alloc_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2348
 __bio_alloc_page_pool fs/bcachefs/io_write.c:113 [inline]
 bch2_bio_alloc_pages_pool+0xc2/0x2d0 fs/bcachefs/io_write.c:134
 __bch2_read_extent+0x33b8/0x6a50 fs/bcachefs/io_read.c:988
 bch2_read_extent fs/bcachefs/io_read.h:120 [inline]
 bchfs_read+0x2f5e/0x3660 fs/bcachefs/fs-io-buffered.c:217
 bch2_readahead+0x14a8/0x1970 fs/bcachefs/fs-io-buffered.c:277
 read_pages+0x193/0x1110 mm/readahead.c:160
 page_cache_ra_order+0xdb1/0x1250 mm/readahead.c:512
 page_cache_sync_ra+0xed1/0x11a0 mm/readahead.c:612
 page_cache_sync_readahead include/linux/pagemap.h:1397 [inline]
 filemap_get_pages+0x5a8/0x3860 mm/filemap.c:2546
 filemap_read+0x613/0x1560 mm/filemap.c:2646
 bch2_read_iter+0x1a90/0x2010 fs/bcachefs/fs-io-direct.c:208
 __kernel_read+0x726/0xd30 fs/read_write.c:523
 kernel_read+0xcb/0x100 fs/read_write.c:541
 prepare_binprm fs/exec.c:1683 [inline]
 search_binary_handler fs/exec.c:1732 [inline]
 exec_binprm fs/exec.c:1790 [inline]
 bprm_execve+0xa75/0x21c0 fs/exec.c:1842
 do_execveat_common+0xd5d/0xe00 fs/exec.c:1949
 do_execveat fs/exec.c:2034 [inline]
 __do_sys_execveat fs/exec.c:2108 [inline]
 __se_sys_execveat fs/exec.c:2102 [inline]
 __x64_sys_execveat+0x13f/0x1b0 fs/exec.c:2102
 x64_sys_call+0x32b1/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:323
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 1017 Comm: kworker/u8:5 Not tainted 6.13.0-rc2-syzkaller-00130-g150b567e0d57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Workqueue: events_unbound __bch2_read_endio
=====================================================