=====================================================
BUG: KMSAN: uninit-value in LZ4_decompress_generic lib/lz4/lz4_decompress.c:147 [inline]
BUG: KMSAN: uninit-value in LZ4_decompress_safe_partial+0x94a/0x2190 lib/lz4/lz4_decompress.c:472
 LZ4_decompress_generic lib/lz4/lz4_decompress.c:147 [inline]
 LZ4_decompress_safe_partial+0x94a/0x2190 lib/lz4/lz4_decompress.c:472
 __bio_uncompress+0x62a/0xde0 fs/bcachefs/compress.c:200
 bch2_bio_uncompress+0x523/0x880 fs/bcachefs/compress.c:323
 __bch2_read_endio+0x18de/0x2340 fs/bcachefs/io_read.c:790
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd59/0xf00 kernel/kthread.c:464
 ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:4993
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2301
 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline]
 alloc_pages_noprof+0x102/0x280 mm/mempolicy.c:2392
 __bio_alloc_page_pool fs/bcachefs/io_write.c:119 [inline]
 bch2_bio_alloc_pages_pool+0x8f/0x230 fs/bcachefs/io_write.c:140
 __bch2_read_extent+0x3451/0x60a0 fs/bcachefs/io_read.c:1096
 bch2_read_extent fs/bcachefs/io_read.h:140 [inline]
 bchfs_read+0x3afd/0x4690 fs/bcachefs/fs-io-buffered.c:226
 bch2_readahead+0x1579/0x1c10 fs/bcachefs/fs-io-buffered.c:316
 read_pages+0x159/0xe40 mm/readahead.c:160
 page_cache_ra_order+0xeab/0x14f0 mm/readahead.c:515
 page_cache_sync_ra+0x108a/0x13e0 mm/readahead.c:621
 filemap_get_pages+0xfb3/0x3a70 mm/filemap.c:2591
 filemap_read+0x5c6/0x2190 mm/filemap.c:2702
 bch2_read_iter+0x559/0x21c0 fs/bcachefs/fs-io-direct.c:221
 __kernel_read+0x750/0xda0 fs/read_write.c:528
 integrity_kernel_read+0x77/0x90 security/integrity/iint.c:28
 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline]
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline]
 ima_calc_file_hash+0x1ff9/0x3fd0 security/integrity/ima/ima_crypto.c:568
 ima_collect_measurement+0x45d/0xe60 security/integrity/ima/ima_api.c:293
 process_measurement+0x2d1a/0x40e0 security/integrity/ima/ima_main.c:385
 ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:613
 security_file_post_open+0xbf/0x530 security/security.c:3130
 do_open fs/namei.c:3882 [inline]
 path_openat+0x5ac3/0x6760 fs/namei.c:4039
 do_filp_open+0x280/0x660 fs/namei.c:4066
 do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_openat fs/open.c:1460 [inline]
 __se_sys_openat fs/open.c:1455 [inline]
 __x64_sys_openat+0x240/0x300 fs/open.c:1455
 x64_sys_call+0x213/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 2201 Comm: kworker/u8:7 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: events_unbound __bch2_read_endio
=====================================================