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BUG: KMSAN: uninit-value in __writepoint_find fs/bcachefs/alloc_foreground.c:1091 [inline]
BUG: KMSAN: uninit-value in writepoint_find fs/bcachefs/alloc_foreground.c:1165 [inline]
BUG: KMSAN: uninit-value in bch2_alloc_sectors_start_trans+0x750/0x3560 fs/bcachefs/alloc_foreground.c:1273
 __writepoint_find fs/bcachefs/alloc_foreground.c:1091 [inline]
 writepoint_find fs/bcachefs/alloc_foreground.c:1165 [inline]
 bch2_alloc_sectors_start_trans+0x750/0x3560 fs/bcachefs/alloc_foreground.c:1273
 __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:2634
 __writeback_single_inode+0x101/0x1190 fs/fs-writeback.c:1680
 writeback_sb_inodes+0xac1/0x1cb0 fs/fs-writeback.c:1976
 wb_writeback+0x4ce/0xc00 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x397/0x1910 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 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:
 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:2612
 bch2_writepages+0x153/0x570 fs/bcachefs/fs-io-buffered.c:666
 do_writepages+0x3f2/0x860 mm/page-writeback.c:2634
 __writeback_single_inode+0x101/0x1190 fs/fs-writeback.c:1680
 writeback_sb_inodes+0xac1/0x1cb0 fs/fs-writeback.c:1976
 wb_writeback+0x4ce/0xc00 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x397/0x1910 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 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:5171
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof+0xf7/0x200 mm/mempolicy.c:2487
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0x24d/0x1220 mm/slub.c:2655
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0x1024/0x34e0 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 kmem_cache_alloc_lru_noprof+0x922/0xed0 mm/slub.c:4248
 __bch2_new_inode+0x9b/0x4b0 fs/bcachefs/fs.c:455
 bch2_new_inode fs/bcachefs/fs.c:481 [inline]
 bch2_inode_hash_init_insert+0x82/0x3c0 fs/bcachefs/fs.c:501
 bch2_vfs_inode_get+0x565/0x710 fs/bcachefs/fs.c:524
 bch2_fs_get_tree+0x1f68/0x2b50 fs/bcachefs/fs.c:2572
 vfs_get_tree+0xb3/0x5c0 fs/super.c:1815
 do_new_mount+0x733/0x1420 fs/namespace.c:3805
 path_mount+0x6db/0x1e90 fs/namespace.c:4120
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount+0x6eb/0x7d0 fs/namespace.c:4321
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4321
 x64_sys_call+0x3604/0x3e20 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

CPU: 1 UID: 0 PID: 3933 Comm: kworker/u8:15 Not tainted 6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-bcachefs-41)
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