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BUG: KMSAN: uninit-value in sw842_compress+0xd19/0x4fa0 lib/842/842_compress.c:528
 sw842_compress+0xd19/0x4fa0 lib/842/842_compress.c:528
 crypto842_scompress+0x4e/0x70 crypto/842.c:46
 scomp_acomp_comp_decomp+0xa46/0x1120 include/crypto/internal/scompress.h:-1
 scomp_acomp_compress+0x33/0x40 crypto/scompress.c:282
 crypto_acomp_compress+0x5b1/0xe80 crypto/acompress.c:291
 zswap_compress mm/zswap.c:886 [inline]
 zswap_store_page mm/zswap.c:1429 [inline]
 zswap_store+0x1ea0/0x4bb0 mm/zswap.c:1540
 swap_writeout+0x8c1/0x1390 mm/page_io.c:275
 shmem_writeout+0x1ac6/0x1f70 mm/shmem.c:1643
 writeout mm/vmscan.c:660 [inline]
 pageout mm/vmscan.c:721 [inline]
 shrink_folio_list+0x56ca/0x7e30 mm/vmscan.c:1453
 evict_folios+0x9a43/0xc010 mm/vmscan.c:4745
 try_to_shrink_lruvec+0x12b6/0x17e0 mm/vmscan.c:4908
 shrink_one+0x6b5/0xe10 mm/vmscan.c:4953
 shrink_many mm/vmscan.c:5016 [inline]
 lru_gen_shrink_node mm/vmscan.c:5094 [inline]
 shrink_node+0x481a/0x54a0 mm/vmscan.c:6081
 kswapd_shrink_node mm/vmscan.c:6941 [inline]
 balance_pgdat mm/vmscan.c:7124 [inline]
 kswapd+0x2b99/0x4ce0 mm/vmscan.c:7389
 kthread+0xd59/0xf00 kernel/kthread.c:463
 ret_from_fork+0x233/0x380 arch/x86/kernel/process.c:148
 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:73 [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:249 [inline]
 copy_folio_from_iter_atomic+0x11f7/0x3c20 lib/iov_iter.c:479
 generic_perform_write+0x8b1/0x1050 mm/filemap.c:4242
 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3464
 lo_rw_aio+0x1265/0x1590 drivers/block/loop.c:-1
 do_req_filebacked drivers/block/loop.c:-1 [inline]
 loop_handle_cmd drivers/block/loop.c:1919 [inline]
 loop_process_work+0xe30/0x1ec0 drivers/block/loop.c:1954
 loop_workfn+0x3e/0x60 drivers/block/loop.c:1978
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3346
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427
 kthread+0xd59/0xf00 kernel/kthread.c:463
 ret_from_fork+0x233/0x380 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was stored to memory at:
 lmWriteRecord+0x135c/0x1e40 fs/jfs/jfs_logmgr.c:473
 lmLogInit+0x2012/0x27a0 fs/jfs/jfs_logmgr.c:1367
 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline]
 lmLogOpen+0xaef/0x21a0 fs/jfs/jfs_logmgr.c:1069
 jfs_mount_rw+0xdf/0x9f0 fs/jfs/jfs_mount.c:257
 jfs_fill_super+0xabf/0x18f0 fs/jfs/super.c:532
 get_tree_bdev_flags+0x6e3/0x920 fs/super.c:1691
 get_tree_bdev+0x38/0x50 fs/super.c:1714
 jfs_get_tree+0x35/0x40 fs/jfs/super.c:635
 vfs_get_tree+0xb0/0x5c0 fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x839/0x15f0 fs/namespace.c:3727
 path_mount+0x747/0x1fb0 fs/namespace.c:4037
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x6f7/0x7e0 fs/namespace.c:4215
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4215
 x64_sys_call+0x3604/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable lrd created at:
 lmLogInit+0x41/0x27a0 fs/jfs/jfs_logmgr.c:1243
 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline]
 lmLogOpen+0xaef/0x21a0 fs/jfs/jfs_logmgr.c:1069

CPU: 1 UID: 0 PID: 87 Comm: kswapd1 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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