Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in sw842_compress
=====================================================
BUG: KMSAN: uninit-value in check_template lib/842/842_compress.c:393 [inline]
BUG: KMSAN: uninit-value in process_next lib/842/842_compress.c:458 [inline]
BUG: KMSAN: uninit-value in sw842_compress+0x1744/0x5a70 lib/842/842_compress.c:545
check_template lib/842/842_compress.c:393 [inline]
process_next lib/842/842_compress.c:458 [inline]
sw842_compress+0x1744/0x5a70 lib/842/842_compress.c:545
crypto842_scompress+0x4f/0x70 crypto/842.c:78
scomp_acomp_comp_decomp+0x7c6/0xb90
scomp_acomp_compress+0x32/0x40 crypto/scompress.c:187
crypto_acomp_compress include/crypto/acompress.h:251 [inline]
zswap_compress+0x368/0xad0 mm/zswap.c:927
zswap_store+0x1af3/0x2dd0 mm/zswap.c:1459
swap_writepage+0x11f/0x470 mm/page_io.c:198
shmem_writepage+0x1a75/0x1f70 mm/shmem.c:1536
pageout mm/vmscan.c:680 [inline]
shrink_folio_list+0x577f/0x7cb0 mm/vmscan.c:1360
evict_folios+0x9a49/0xbb30 mm/vmscan.c:4560
try_to_shrink_lruvec+0x13a3/0x1750 mm/vmscan.c:4755
lru_gen_shrink_lruvec mm/vmscan.c:4897 [inline]
shrink_lruvec+0x4a3/0x46c0 mm/vmscan.c:5652
shrink_node_memcgs mm/vmscan.c:5888 [inline]
shrink_node+0x104e/0x50f0 mm/vmscan.c:5928
shrink_zones mm/vmscan.c:6172 [inline]
do_try_to_free_pages+0x820/0x2550 mm/vmscan.c:6234
try_to_free_mem_cgroup_pages+0x3f7/0xae0 mm/vmscan.c:6566
try_charge_memcg+0x72c/0x1830 mm/memcontrol.c:2210
try_charge mm/memcontrol-v1.h:20 [inline]
charge_memcg mm/memcontrol.c:4438 [inline]
__mem_cgroup_charge+0x11d/0x3f0 mm/memcontrol.c:4453
mem_cgroup_charge include/linux/memcontrol.h:672 [inline]
shmem_alloc_and_add_folio+0xe83/0x1ca0 mm/shmem.c:1792
shmem_get_folio_gfp+0x10bd/0x24c0 mm/shmem.c:2188
shmem_read_folio_gfp+0x80/0x140 mm/shmem.c:5201
drm_gem_get_pages+0x3cf/0x1440 drivers/gpu/drm/drm_gem.c:568
drm_gem_shmem_get_pages drivers/gpu/drm/drm_gem_shmem_helper.c:177 [inline]
drm_gem_shmem_vmap+0x2dc/0xca0 drivers/gpu/drm/drm_gem_shmem_helper.c:337
drm_gem_shmem_object_vmap+0x35/0x40 include/drm/drm_gem_shmem_helper.h:229
drm_gem_vmap drivers/gpu/drm/drm_gem.c:1205 [inline]
drm_gem_vmap_unlocked+0xc6/0x200 drivers/gpu/drm/drm_gem.c:1247
drm_gem_fb_vmap+0x11b/0x590 drivers/gpu/drm/drm_gem_framebuffer_helper.c:365
vkms_prepare_fb+0x12f/0x170 drivers/gpu/drm/vkms/vkms_plane.c:176
drm_atomic_helper_prepare_planes+0x436/0x10b0 drivers/gpu/drm/drm_atomic_helper.c:2601
drm_atomic_helper_commit+0x1f3/0xe80 drivers/gpu/drm/drm_atomic_helper.c:2029
drm_atomic_commit+0x30a/0x380 drivers/gpu/drm/drm_atomic.c:1522
drm_atomic_helper_update_plane+0x42b/0x600 drivers/gpu/drm/drm_atomic_helper.c:3190
__setplane_atomic+0x33d/0x3f0 drivers/gpu/drm/drm_plane.c:1074
drm_mode_cursor_universal drivers/gpu/drm/drm_plane.c:1229 [inline]
drm_mode_cursor_common+0x171a/0x1e80 drivers/gpu/drm/drm_plane.c:1288
drm_mode_cursor_ioctl+0x97/0xd0 drivers/gpu/drm/drm_plane.c:1338
drm_ioctl_kernel+0x4ea/0x560 drivers/gpu/drm/drm_ioctl.c:745
drm_ioctl+0xd13/0x15a0 drivers/gpu/drm/drm_ioctl.c:842
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x261/0x450 fs/ioctl.c:893
__x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:893
x64_sys_call+0x18bf/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:17
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
<Zero or more stacks not recorded to save memory>
Uninit was stored to memory at:
memcpy_from_iter lib/iov_iter.c:73 [inline]
iterate_bvec include/linux/iov_iter.h:122 [inline]
iterate_and_advance2 include/linux/iov_iter.h:249 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
copy_page_from_iter_atomic+0x12bb/0x2ae0 lib/iov_iter.c:481
copy_folio_from_iter_atomic include/linux/uio.h:186 [inline]
generic_perform_write+0x896/0x12e0 mm/filemap.c:4032
shmem_file_write_iter+0x2bd/0x2f0 mm/shmem.c:3074
do_iter_readv_writev+0x8a1/0xa40
vfs_iter_write+0x459/0xd50 fs/read_write.c:895
lo_write_bvec drivers/block/loop.c:243 [inline]
lo_write_simple drivers/block/loop.c:264 [inline]
do_req_filebacked drivers/block/loop.c:511 [inline]
loop_handle_cmd drivers/block/loop.c:1910 [inline]
loop_process_work+0x15ec/0x3750 drivers/block/loop.c:1945
loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1976
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
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 stored to memory at:
ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
indx_write fs/ntfs3/index.c:1027 [inline]
indx_update_dup+0xd81/0xf80 fs/ntfs3/index.c:2694
ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
write_inode fs/fs-writeback.c:1497 [inline]
__writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
__writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
wb_check_background_flush fs/fs-writeback.c:2199 [inline]
wb_do_writeback fs/fs-writeback.c:2287 [inline]
wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
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 stored to memory at:
ntfs_read_run_nb+0x786/0x1070 fs/ntfs3/fsntfs.c:1252
ntfs_read_bh+0x64/0xde0 fs/ntfs3/fsntfs.c:1313
indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
indx_find+0xd12/0x1440 fs/ntfs3/index.c:1181
indx_update_dup+0x607/0xf80 fs/ntfs3/index.c:2666
ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
write_inode fs/fs-writeback.c:1497 [inline]
__writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
__writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
wb_check_background_flush fs/fs-writeback.c:2199 [inline]
wb_do_writeback fs/fs-writeback.c:2287 [inline]
wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
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 stored to memory at:
ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
indx_write fs/ntfs3/index.c:1027 [inline]
indx_update_dup+0xd81/0xf80 fs/ntfs3/index.c:2694
ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
write_inode fs/fs-writeback.c:1497 [inline]
__writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
__writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
wb_check_background_flush fs/fs-writeback.c:2199 [inline]
wb_do_writeback fs/fs-writeback.c:2287 [inline]
wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
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 stored to memory at:
ntfs_read_run_nb+0x786/0x1070 fs/ntfs3/fsntfs.c:1252
ntfs_read_bh+0x64/0xde0 fs/ntfs3/fsntfs.c:1313
indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
indx_find+0xd12/0x1440 fs/ntfs3/index.c:1181
indx_update_dup+0x607/0xf80 fs/ntfs3/index.c:2666
ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
write_inode fs/fs-writeback.c:1497 [inline]
__writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
__writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2018
wb_writeback+0x50b/0xea0 fs/fs-writeback.c:2129
wb_check_background_flush fs/fs-writeback.c:2199 [inline]
wb_do_writeback fs/fs-writeback.c:2287 [inline]
wb_workfn+0x122c/0x1940 fs/fs-writeback.c:2314
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3393
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 stored to memory at:
ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
indx_write fs/ntfs3/index.c:1027 [inline]
indx_insert_into_buffer+0xd8f/0x2010 fs/ntfs3/index.c:1811
indx_insert_entry+0xa3c/0xee0 fs/ntfs3/index.c:1988
ni_add_name+0xe5d/0x10d0 fs/ntfs3/frecord.c:3123
ntfs_link_inode+0x265/0x310 fs/ntfs3/inode.c:1768
ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
vfs_link+0x93d/0xb70 fs/namei.c:4692
do_linkat+0x4f5/0xfd0 fs/namei.c:4762
__do_sys_link fs/namei.c:4796 [inline]
__se_sys_link fs/namei.c:4794 [inline]
__x64_sys_link+0xe8/0x140 fs/namei.c:4794
x64_sys_call+0x2853/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:87
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
Uninit was stored to memory at:
hdr_insert_de fs/ntfs3/index.c:838 [inline]
indx_insert_into_buffer+0xcdf/0x2010 fs/ntfs3/index.c:1807
indx_insert_entry+0xa3c/0xee0 fs/ntfs3/index.c:1988
ni_add_name+0xe5d/0x10d0 fs/ntfs3/frecord.c:3123
ntfs_link_inode+0x265/0x310 fs/ntfs3/inode.c:1768
ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
vfs_link+0x93d/0xb70 fs/namei.c:4692
do_linkat+0x4f5/0xfd0 fs/namei.c:4762
__do_sys_link fs/namei.c:4796 [inline]
__se_sys_link fs/namei.c:4794 [inline]
__x64_sys_link+0xe8/0x140 fs/namei.c:4794
x64_sys_call+0x2853/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:87
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
Uninit was created at:
slab_post_alloc_hook mm/slub.c:3998 [inline]
slab_alloc_node mm/slub.c:4041 [inline]
kmem_cache_alloc_noprof+0x637/0xb20 mm/slub.c:4048
ntfs_link_inode+0x8f/0x310 fs/ntfs3/inode.c:1756
ntfs_link+0x21d/0x500 fs/ntfs3/namei.c:146
vfs_link+0x93d/0xb70 fs/namei.c:4692
do_linkat+0x4f5/0xfd0 fs/namei.c:4762
__do_sys_link fs/namei.c:4796 [inline]
__se_sys_link fs/namei.c:4794 [inline]
__x64_sys_link+0xe8/0x140 fs/namei.c:4794
x64_sys_call+0x2853/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:87
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: 1 UID: 0 PID: 5939 Comm: syz.0.15 Not tainted 6.11.0-rc7-syzkaller-g196145c606d0-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================
Tested on:
commit: 196145c6 Merge tag 'clk-fixes-for-linus' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=159027c7980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea008021530b2de3
dashboard link: https://syzkaller.appspot.com/bug?extid=17cae3c0a5b0acdc327d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=1453949f980000