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================================================================== BUG: KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic write to 0xffff888127ed44a2 of 2 bytes by task 9229 on cpu 1: 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_folio_from_iter_atomic+0x7fc/0x1170 lib/iov_iter.c:479 generic_perform_write+0x2c2/0x490 mm/filemap.c:4130 ext4_buffered_write_iter+0x1ee/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x383/0xf00 fs/ext4/file.c:-1 iter_file_splice_write+0x5f2/0x970 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x156/0x2a0 fs/splice.c:1158 splice_direct_to_actor+0x312/0x680 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1227 do_sendfile+0x380/0x650 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417 x64_sys_call+0xb39/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888127ed4400 of 1024 bytes by task 7188 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_folio_from_iter_atomic+0x7fc/0x1170 lib/iov_iter.c:479 generic_perform_write+0x2c2/0x490 mm/filemap.c:4130 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3463 lo_rw_aio+0x6ea/0x7a0 include/linux/fs.h:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1890 [inline] loop_process_work+0x52d/0xa60 drivers/block/loop.c:1925 loop_workfn+0x31/0x40 drivers/block/loop.c:1949 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321 worker_thread+0x582/0x770 kernel/workqueue.c:3402 kthread+0x486/0x510 kernel/kthread.c:464 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 7188 Comm: kworker/u8:19 Not tainted 6.16.0-rc1-syzkaller-00004-gaef17cb3d3c4 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: loop8 loop_workfn ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/06/10 22:25 | upstream | aef17cb3d3c4 | 5d7e17ca | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/10 07:56 | upstream | f09079bd04a9 | 4826c28e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/09 09:19 | upstream | 19272b37aa4f | 4826c28e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/07 23:49 | upstream | 5b032cac6225 | 4826c28e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/07 23:48 | upstream | 5b032cac6225 | 4826c28e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/07 02:45 | upstream | c0c9379f235d | 4826c28e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/06 21:59 | upstream | c0c9379f235d | 9fa58bba | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/04 23:36 | upstream | 1af80d00e1e0 | 6b6b5f21 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic | ||
2025/06/04 17:42 | upstream | 1af80d00e1e0 | e565f08d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic |