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================================================================== BUG: KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put write to 0xffff88811c436aba of 2 bytes by task 5581 on cpu 1: fat16_ent_put+0x28/0x60 fs/fat/fatent.c:183 fat_alloc_clusters+0x4ce/0xa80 fs/fat/fatent.c:503 fat_add_cluster fs/fat/inode.c:107 [inline] __fat_get_block fs/fat/inode.c:154 [inline] fat_get_block+0x258/0x5e0 fs/fat/inode.c:189 __block_write_begin_int+0x419/0xf70 fs/buffer.c:2151 block_write_begin fs/buffer.c:2262 [inline] cont_write_begin+0x5a3/0x8e0 fs/buffer.c:2601 fat_write_begin+0x4f/0xe0 fs/fat/inode.c:228 generic_perform_write+0x181/0x490 mm/filemap.c:4103 __generic_file_write_iter+0x9e/0x120 mm/filemap.c:4220 generic_file_write_iter+0x8d/0x2f0 mm/filemap.c:4246 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x49d/0x8d0 fs/read_write.c:684 ksys_write+0xda/0x1a0 fs/read_write.c:736 __do_sys_write fs/read_write.c:747 [inline] __se_sys_write fs/read_write.c:744 [inline] __x64_sys_write+0x40/0x50 fs/read_write.c:744 x64_sys_call+0x2cdd/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811c436a00 of 512 bytes by task 2228 on cpu 0: memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_page_from_iter_atomic+0x77f/0xff0 lib/iov_iter.c:483 copy_folio_from_iter_atomic include/linux/uio.h:210 [inline] generic_perform_write+0x2c2/0x490 mm/filemap.c:4121 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3464 lo_rw_aio+0x5f7/0x7c0 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1866 [inline] loop_process_work+0x52d/0xa60 drivers/block/loop.c:1901 loop_workfn+0x31/0x40 drivers/block/loop.c:1925 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319 worker_thread+0x582/0x770 kernel/workqueue.c:3400 kthread+0x486/0x510 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 2228 Comm: kworker/u8:6 Not tainted 6.15.0-rc4-syzkaller-00296-ge8ab83e34bdc #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: loop2 loop_workfn ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/05/04 10:18 | upstream | e8ab83e34bdc | b0714e37 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put | ||
2025/05/03 21:11 | upstream | 2a239ffbebb5 | b0714e37 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put | ||
2025/05/01 13:51 | upstream | 4f79eaa2ceac | 51b137cd | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put | ||
2025/05/01 13:50 | upstream | 4f79eaa2ceac | 51b137cd | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put | ||
2025/04/29 20:39 | upstream | ca91b9500108 | 85a5a23f | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put | ||
2025/04/28 18:01 | upstream | f15d97df5afa | c6b4fb39 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_page_from_iter_atomic / fat16_ent_put |