=====================================================
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+0xb91/0x1d80 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd59/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e3/0x310 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+0xb91/0x1d80 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd59/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4186 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_lru_noprof+0x822/0xed0 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_lookup_trans fs/bcachefs/fs.c:691 [inline]
 bch2_lookup+0x1fbf/0x2540 fs/bcachefs/fs.c:719
 __lookup_slow+0x563/0x760 fs/namei.c:1808
 lookup_slow+0x6a/0xd0 fs/namei.c:1825
 walk_component+0x444/0x650 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x251/0x6b0 fs/namei.c:2654
 filename_lookup+0x2bd/0x800 fs/namei.c:2683
 user_path_at+0x91/0x3d0 fs/namei.c:3127
 ksys_umount fs/namespace.c:2115 [inline]
 __do_sys_umount fs/namespace.c:2123 [inline]
 __se_sys_umount fs/namespace.c:2121 [inline]
 __x64_sys_umount+0x143/0x250 fs/namespace.c:2121
 x64_sys_call+0x1057/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:167
 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: 3719 Comm: kworker/u8:11 Tainted: G        W           6.16.0-syzkaller-11322-g352af6a011d5 #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-bcachefs-16)
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