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:391 [inline] BUG: KMSAN: uninit-value in process_next lib/842/842_compress.c:456 [inline] BUG: KMSAN: uninit-value in sw842_compress+0x15eb/0x5990 lib/842/842_compress.c:543 check_template lib/842/842_compress.c:391 [inline] process_next lib/842/842_compress.c:456 [inline] sw842_compress+0x15eb/0x5990 lib/842/842_compress.c:543 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+0xea7/0x14d0 kernel/workqueue.c:3389 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+0xea7/0x14d0 kernel/workqueue.c:3389 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+0xea7/0x14d0 kernel/workqueue.c:3389 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+0xea7/0x14d0 kernel/workqueue.c:3389 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+0xea7/0x14d0 kernel/workqueue.c:3389 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:150 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:150 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:150 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: 6036 Comm: syz.0.15 Not tainted 6.11.0-rc7-syzkaller-gda3ea35007d0-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ===================================================== Tested on: commit: da3ea350 Linux 6.11-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17a0e567980000 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=11514e00580000
