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KCSAN: data-race in ext4_handle_inode_extension / filemap_read

Status: auto-closed as invalid on 2021/05/19 12:34
Subsystems: ext4
[Documentation on labels]
First crash: 1109d, last: 1079d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in ext4_handle_inode_extension / filemap_read

write to 0xffff888009659c90 of 8 bytes by task 16435 on cpu 0:
 i_size_write include/linux/fs.h:872 [inline]
 ext4_update_inode_size fs/ext4/ext4.h:3292 [inline]
 ext4_handle_inode_extension+0x226/0x550 fs/ext4/file.c:331
 ext4_dio_write_iter fs/ext4/file.c:557 [inline]
 ext4_file_write_iter+0xef4/0x10b0 fs/ext4/file.c:661
 call_write_iter include/linux/fs.h:1977 [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+0x7a6/0xe20 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888009659c90 of 8 bytes by task 16449 on cpu 1:
 i_size_read include/linux/fs.h:850 [inline]
 filemap_read+0x1dc/0x7b0 mm/filemap.c:2470
 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609
 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1971 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16449 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/04/14 12:33 upstream 50987beca096 3134b37f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/13 23:28 upstream eebe426d32e1 a184b83e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/13 20:10 upstream 89698becf06d a184b83e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/12 09:11 upstream 7d900724913c 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/08 09:47 upstream 454859c552da 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/06 23:47 upstream 2d743660786e 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/05 06:18 upstream e49d033bddf5 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/04 05:17 upstream 2023a53bdf41 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/04/03 13:57 upstream d93a0d43e3d0 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/31 23:00 upstream d19cc4bfbff1 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/27 13:24 upstream 0f4498cef9f5 a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/20 22:24 upstream 812da4d39463 17810eae .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/18 20:59 upstream bf152b0b41dc 380dcc3e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/18 11:45 upstream 6417f03132a6 7216542e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/16 06:34 upstream 1a4431a5db2b fdb2bb2c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
2021/03/15 10:21 upstream 1e28eed17697 cc1cff8f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_handle_inode_extension / filemap_read
* Struck through repros no longer work on HEAD.