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BUG: KMSAN: uninit-value in __writepoint_find fs/bcachefs/alloc_foreground.c:1090 [inline]
BUG: KMSAN: uninit-value in writepoint_find fs/bcachefs/alloc_foreground.c:1164 [inline]
BUG: KMSAN: uninit-value in bch2_alloc_sectors_start_trans+0x750/0x3560 fs/bcachefs/alloc_foreground.c:1272
 __writepoint_find fs/bcachefs/alloc_foreground.c:1090 [inline]
 writepoint_find fs/bcachefs/alloc_foreground.c:1164 [inline]
 bch2_alloc_sectors_start_trans+0x750/0x3560 fs/bcachefs/alloc_foreground.c:1272
 __bch2_write+0x7ff/0x6bc0 fs/bcachefs/io_write.c:1533
 bch2_write+0xcc5/0x1860 fs/bcachefs/io_write.c:1722
 closure_queue include/linux/closure.h:270 [inline]
 closure_call include/linux/closure.h:432 [inline]
 bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:486 [inline]
 bch2_writepages+0x26b/0x570 fs/bcachefs/fs-io-buffered.c:668
 do_writepages+0x3f2/0x860 mm/page-writeback.c:2636
 filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
 __filemap_fdatawrite_range mm/filemap.c:419 [inline]
 filemap_write_and_wait_range+0x5bb/0x840 mm/filemap.c:691
 bchfs_truncate+0xc85/0x1550 fs/bcachefs/fs-io.c:-1
 bch2_setattr+0x298/0x300 fs/bcachefs/fs.c:1243
 notify_change+0x1993/0x1aa0 fs/attr.c:552
 do_truncate+0x28f/0x310 fs/open.c:68
 vfs_truncate+0x921/0x9d0 fs/open.c:118
 do_sys_truncate+0x103/0x240 fs/open.c:141
 __do_sys_truncate fs/open.c:153 [inline]
 __se_sys_truncate fs/open.c:151 [inline]
 __x64_sys_truncate+0x74/0xb0 fs/open.c:151
 x64_sys_call+0x321f/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:77
 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

Uninit was stored to memory at:
 bch2_writepage_io_alloc fs/bcachefs/fs-io-buffered.c:514 [inline]
 __bch2_writepage+0x2b40/0x3c90 fs/bcachefs/fs-io-buffered.c:636
 write_cache_pages+0xc5/0x270 mm/page-writeback.c:2614
 bch2_writepages+0x153/0x570 fs/bcachefs/fs-io-buffered.c:666
 do_writepages+0x3f2/0x860 mm/page-writeback.c:2636
 filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
 __filemap_fdatawrite_range mm/filemap.c:419 [inline]
 filemap_write_and_wait_range+0x5bb/0x840 mm/filemap.c:691
 bchfs_truncate+0xc85/0x1550 fs/bcachefs/fs-io.c:-1
 bch2_setattr+0x298/0x300 fs/bcachefs/fs.c:1243
 notify_change+0x1993/0x1aa0 fs/attr.c:552
 do_truncate+0x28f/0x310 fs/open.c:68
 vfs_truncate+0x921/0x9d0 fs/open.c:118
 do_sys_truncate+0x103/0x240 fs/open.c:141
 __do_sys_truncate fs/open.c:153 [inline]
 __se_sys_truncate fs/open.c:151 [inline]
 __x64_sys_truncate+0x74/0xb0 fs/open.c:151
 x64_sys_call+0x321f/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:77
 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

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4154 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 kmem_cache_alloc_lru_noprof+0x822/0xed0 mm/slub.c:4216
 __bch2_new_inode+0x9b/0x4b0 fs/bcachefs/fs.c:455
 __bch2_create+0x286/0x1650 fs/bcachefs/fs.c:558
 bch2_mknod fs/bcachefs/fs.c:750 [inline]
 bch2_create+0xba/0x1c0 fs/bcachefs/fs.c:764
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x2d47/0x6760 fs/namei.c:4043
 do_filp_open+0x280/0x660 fs/namei.c:4073
 do_sys_openat2+0x1bb/0x2f0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_open fs/open.c:1460 [inline]
 __se_sys_open fs/open.c:1456 [inline]
 __x64_sys_open+0x219/0x2c0 fs/open.c:1456
 x64_sys_call+0x18ec/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:3
 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

CPU: 0 UID: 0 PID: 6988 Comm: syz.1.324 Not tainted 6.16.0-rc1-syzkaller-00101-g27605c8c0f69 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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