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================================================================== BUG: KCSAN: data-race in filemap_fault / generic_write_end write to 0xffff888106675840 of 8 bytes by task 6955 on cpu 0: i_size_write include/linux/fs.h:871 [inline] generic_write_end+0x96/0x180 fs/buffer.c:2207 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3110 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3671 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888106675840 of 8 bytes by task 6956 on cpu 1: i_size_read include/linux/fs.h:849 [inline] filemap_fault+0x88/0x7b0 mm/filemap.c:2971 ext4_filemap_fault+0x4b/0x60 fs/ext4/inode.c:6194 __do_fault mm/memory.c:3678 [inline] do_shared_fault mm/memory.c:4034 [inline] do_fault mm/memory.c:4112 [inline] handle_pte_fault mm/memory.c:4367 [inline] __handle_mm_fault mm/memory.c:4502 [inline] handle_mm_fault+0xf76/0x1a70 mm/memory.c:4600 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x94/0x230 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577 copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:205 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:190 [inline] copy_page_to_iter_iovec lib/iov_iter.c:261 [inline] copy_page_to_iter+0x32d/0x860 lib/iov_iter.c:973 filemap_read+0xf06/0x1230 mm/filemap.c:2605 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x565/0x5d0 fs/read_write.c:496 ksys_read+0xce/0x180 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:642 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000363000 -> 0x0000000000363e00 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6956 Comm: syz-executor.4 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2021/06/03 19:38 | upstream | f88cd3fb9df2 | 0740de69 | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in filemap_fault / generic_write_end | |||
2021/05/05 21:15 | upstream | a79cdfba68a1 | 06c27ff5 | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in filemap_fault / generic_write_end | |||
2021/03/12 10:03 | upstream | f78d76e72a46 | 429d8a6b | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in filemap_fault / generic_write_end |