===================================================== BUG: KMSAN: uninit-value in __writepoint_find include/linux/rcupdate.h:-1 [inline] BUG: KMSAN: uninit-value in writepoint_find fs/bcachefs/alloc_foreground.c:1248 [inline] BUG: KMSAN: uninit-value in bch2_alloc_sectors_start_trans+0x44a/0x32d0 fs/bcachefs/alloc_foreground.c:1348 __writepoint_find include/linux/rcupdate.h:-1 [inline] writepoint_find fs/bcachefs/alloc_foreground.c:1248 [inline] bch2_alloc_sectors_start_trans+0x44a/0x32d0 fs/bcachefs/alloc_foreground.c:1348 __bch2_write+0x7bd/0x6a10 fs/bcachefs/io_write.c:1494 bch2_write+0xdfe/0x1b30 fs/bcachefs/io_write.c:1681 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:494 [inline] bch2_writepages+0x24a/0x3c0 fs/bcachefs/fs-io-buffered.c:677 do_writepages+0x427/0xc30 mm/page-writeback.c:2656 __writeback_single_inode+0x103/0x1290 fs/fs-writeback.c:1680 writeback_sb_inodes+0xac4/0x1c90 fs/fs-writeback.c:1976 wb_writeback+0x4df/0xcb0 fs/fs-writeback.c:2156 wb_do_writeback fs/fs-writeback.c:2303 [inline] wb_workfn+0x40b/0x1970 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xc1d/0x1e80 kernel/workqueue.c:3319 worker_thread+0xea3/0x1500 kernel/workqueue.c:3400 kthread+0x6ce/0xf10 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3686 at kernel/stacktrace.c:29 stack_trace_print+0x102/0x120 kernel/stacktrace.c:29 Modules linked in: CPU: 1 UID: 0 PID: 3686 Comm: kworker/u8:19 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: writeback wb_workfn (flush-bcachefs-37) RIP: 0010:stack_trace_print+0x102/0x120 kernel/stacktrace.c:29 Code: 4b 8d 04 2e 48 ff c0 49 ff c6 48 83 f8 01 0f 85 58 ff ff ff eb 17 31 ff e8 fb 0f bf 00 e9 54 ff ff ff e8 f1 0f bf 00 eb bc 90 <0f> 0b 90 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc RSP: 0018:ffff888117ed2ac0 EFLAGS: 00010246 RAX: ffff8881188bccd8 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888117ed2af0 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8881176d2b08 R11: 0000000000000001 R12: 0000000000000000 R13: 00000000abcd0200 R14: ffff888117ed2b20 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881ab057000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe0902dfe8 CR3: 0000000093372000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kmsan_print_origin+0xad/0x320 mm/kmsan/report.c:133 kmsan_report+0x1d9/0x2d0 mm/kmsan/report.c:196 __msan_warning+0x95/0x120 mm/kmsan/instrumentation.c:318 __writepoint_find include/linux/rcupdate.h:-1 [inline] writepoint_find fs/bcachefs/alloc_foreground.c:1248 [inline] bch2_alloc_sectors_start_trans+0x44a/0x32d0 fs/bcachefs/alloc_foreground.c:1348 __bch2_write+0x7bd/0x6a10 fs/bcachefs/io_write.c:1494 bch2_write+0xdfe/0x1b30 fs/bcachefs/io_write.c:1681 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:494 [inline] bch2_writepages+0x24a/0x3c0 fs/bcachefs/fs-io-buffered.c:677 do_writepages+0x427/0xc30 mm/page-writeback.c:2656 __writeback_single_inode+0x103/0x1290 fs/fs-writeback.c:1680 writeback_sb_inodes+0xac4/0x1c90 fs/fs-writeback.c:1976 wb_writeback+0x4df/0xcb0 fs/fs-writeback.c:2156 wb_do_writeback fs/fs-writeback.c:2303 [inline] wb_workfn+0x40b/0x1970 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xc1d/0x1e80 kernel/workqueue.c:3319 worker_thread+0xea3/0x1500 kernel/workqueue.c:3400 kthread+0x6ce/0xf10 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---[ end trace 0000000000000000 ]--- Uninit was created at: slab_post_alloc_hook mm/slub.c:4157 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_lru_noprof+0x92d/0xe30 mm/slub.c:4219 __bch2_new_inode+0x98/0x450 fs/bcachefs/fs.c:438 __bch2_create+0x284/0x1700 fs/bcachefs/fs.c:541 bch2_mknod fs/bcachefs/fs.c:728 [inline] bch2_create+0xc0/0x1d0 fs/bcachefs/fs.c:742 lookup_open fs/namei.c:3666 [inline] open_last_lookups fs/namei.c:3765 [inline] path_openat+0x2efe/0x6280 fs/namei.c:4001 do_filp_open+0x26b/0x610 fs/namei.c:4031 do_sys_openat2+0x1ca/0x300 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1455 x64_sys_call+0x1fe/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 3686 Comm: kworker/u8:19 Tainted: G W 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: writeback wb_workfn (flush-bcachefs-37) =====================================================