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KCSAN: data-race in shmem_file_read_iter / shmem_setattr (2)

Status: auto-closed as invalid on 2021/06/14 12:51
Subsystems: mm
[Documentation on labels]
First crash: 1111d, last: 1111d
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (8) mm 5 378d 425d 0/26 auto-obsoleted due to no activity on 2023/06/17 08:48
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (9) mm 1 85d 85d 0/26 auto-obsoleted due to no activity on 2024/04/05 18:31
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (7) mm 2 509d 533d 0/26 auto-obsoleted due to no activity on 2023/02/11 12:28
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (5) mm 1 631d 631d 0/26 auto-closed as invalid on 2022/10/07 03:18
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (4) mm 3 691d 695d 0/26 auto-closed as invalid on 2022/08/08 10:34
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (6) mm 2 573d 577d 0/26 auto-obsoleted due to no activity on 2022/12/04 01:06
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr (3) mm 1 961d 961d 0/26 auto-closed as invalid on 2021/11/11 20:26
upstream KCSAN: data-race in shmem_file_read_iter / shmem_setattr mm 3 1219d 1254d 0/26 auto-closed as invalid on 2021/02/26 05:27

Sample crash report:
==================================================================
BUG: KCSAN: data-race in shmem_file_read_iter / shmem_setattr

write to 0xffff888130610b40 of 8 bytes by task 3336 on cpu 1:
 i_size_write include/linux/fs.h:871 [inline]
 shmem_setattr+0x299/0x450 mm/shmem.c:1082
 notify_change+0x8a3/0xa80 fs/attr.c:398
 do_truncate fs/open.c:64 [inline]
 do_sys_ftruncate+0x405/0x4c0 fs/open.c:196
 __do_sys_ftruncate fs/open.c:207 [inline]
 __se_sys_ftruncate fs/open.c:205 [inline]
 __x64_sys_ftruncate+0x2f/0x40 fs/open.c:205
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888130610b40 of 8 bytes by task 3328 on cpu 0:
 i_size_read include/linux/fs.h:849 [inline]
 shmem_file_read_iter+0x222/0x5c0 mm/shmem.c:2624
 call_read_iter include/linux/fs.h:2108 [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+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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3328 Comm: syz-executor.4 Tainted: G        W         5.13.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/05/10 12:43 upstream 6efb943b8616 ca873091 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_read_iter / shmem_setattr
* Struck through repros no longer work on HEAD.