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================================================================== BUG: KCSAN: data-race in _copy_to_iter / copy_folio_from_iter_atomic write to 0xffff88813af497a2 of 92 bytes by task 14170 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:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_folio_from_iter_atomic+0x7fc/0x11b0 lib/iov_iter.c:479 generic_perform_write+0x2c2/0x490 mm/filemap.c:4260 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3464 iter_file_splice_write+0x666/0xa60 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x156/0x2a0 fs/splice.c:1161 splice_direct_to_actor+0x312/0x680 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1230 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+0x2bb4/0x3000 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 0xffff88813af497a2 of 46 bytes by task 14168 on cpu 1: memcpy_to_iter lib/iov_iter.c:65 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0x602/0xe70 lib/iov_iter.c:185 copy_page_to_iter+0x18f/0x2d0 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] shmem_file_read_iter+0x2d6/0x540 mm/shmem.c:3412 copy_splice_read+0x442/0x660 fs/splice.c:363 do_splice_read fs/splice.c:981 [inline] splice_direct_to_actor+0x290/0x680 fs/splice.c:1086 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1230 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+0x2bb4/0x3000 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 14168 Comm: syz.4.3052 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/10/20 06:53 | upstream | 211ddde0823f | 1c8c8cd8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in _copy_to_iter / copy_folio_from_iter_atomic | ||
2025/10/20 06:52 | upstream | 211ddde0823f | 1c8c8cd8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in _copy_to_iter / copy_folio_from_iter_atomic | ||
2025/10/20 06:52 | upstream | 211ddde0823f | 1c8c8cd8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in _copy_to_iter / copy_folio_from_iter_atomic | ||
2025/10/19 01:26 | upstream | 1c64efcb083c | 1c8c8cd8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in _copy_to_iter / copy_folio_from_iter_atomic |