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KCSAN: data-race in shmem_file_splice_read / shmem_write_end

Status: moderation: reported on 2023/12/08 00:05
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+3fa16cefdc9e145cbe22@syzkaller.appspotmail.com
First crash: 241d, last: 20h20m

Sample crash report:
==================================================================
BUG: KCSAN: data-race in shmem_file_splice_read / shmem_write_end

write to 0xffff888139f743c0 of 8 bytes by task 8513 on cpu 1:
 i_size_write include/linux/fs.h:934 [inline]
 shmem_write_end+0x9a/0x470 mm/shmem.c:2741
 generic_perform_write+0x267/0x410 mm/filemap.c:3941
 shmem_file_write_iter+0xc8/0xe0 mm/shmem.c:2893
 call_write_iter include/linux/fs.h:2087 [inline]
 iter_file_splice_write+0x5de/0x950 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x167/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x2fb/0x660 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888139f743c0 of 8 bytes by task 8512 on cpu 0:
 i_size_read include/linux/fs.h:912 [inline]
 shmem_file_splice_read+0x145/0x600 mm/shmem.c:2961
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x268/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000000000018e2 -> 0x00000000000018f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8512 Comm: syz-executor.2 Not tainted 6.8.0-rc5-syzkaller-00121-g1c892cdd8fe0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================

Crashes (206):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/22 23:16 upstream 1c892cdd8fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/22 14:25 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/21 02:46 upstream fca7526b7d89 3af7dd65 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/19 16:46 upstream b401b621758e 3af7dd65 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/19 05:20 upstream b401b621758e 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/18 19:04 upstream c02197fc9076 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/18 18:54 upstream c02197fc9076 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/16 19:08 upstream 0f1dd5e91e2b 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/15 23:52 upstream 4f5e5092fdbf fd39cf6f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/15 02:58 upstream 8d3dea210042 d9b1cdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/14 22:31 upstream 7e90b5c295ec d9b1cdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/13 19:51 upstream c664e16bb1ba e66542d7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/13 00:52 upstream 716f4aaa7b48 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/11 01:03 upstream a5b6244cf87c 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/10 14:40 upstream 4a7bbe7519b6 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/09 23:33 upstream e6f39a90de92 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/07 13:20 upstream 6d280f4d760e 6404acf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/06 13:28 upstream 99bd3cb0d12e 6404acf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/06 05:57 upstream 54be6c6c5ae8 6404acf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/03 04:14 upstream 021533194476 60bf9982 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/02 10:34 upstream 5c24e4e9e708 d61103fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/01 17:14 upstream 6764c317b6bb 81024119 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/02/01 03:35 upstream 6764c317b6bb 373b66cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/31 12:33 upstream 1bbb19b6eb1b 373b66cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/31 07:32 upstream 2a6526c4f389 7f400fcb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/30 09:55 upstream 861c0981648f 991a98f4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/30 01:28 upstream 41bccc98fb79 991a98f4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/25 13:28 upstream 6098d87eaf31 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/24 19:42 upstream 615d30064886 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/23 21:26 upstream 7ed2632ec7d7 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/23 14:03 upstream 5d9248eed480 1c0ecc51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/23 02:41 upstream 5d9248eed480 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/22 20:31 upstream 6613476e225e 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/20 13:15 upstream 9d64bf433c53 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/18 17:40 upstream 296455ade1fd 239abf84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/17 23:39 upstream 1b1934dbbdcf 915053c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/17 17:36 upstream 052d534373b7 c9a1c95b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/16 10:39 upstream 052d534373b7 2a7bcc7f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/13 11:10 upstream 052d534373b7 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/12 19:24 upstream 70d201a40823 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/12 02:04 upstream 3e7aeb78ab01 dda5a988 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/11 16:25 upstream de927f6c0b07 00f3cc59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/09 11:27 upstream 9f8413c4a66f 4c0fd4bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/09 02:53 upstream 5db8752c3b81 4c0fd4bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/08 09:54 upstream 0dd3ee311255 d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/06 02:30 upstream a4ab2706bb12 d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2024/01/04 21:26 upstream 5eff55d725a4 28c42cff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2023/12/06 14:19 upstream bee0e7762ad2 e3299f55 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
2023/11/28 08:41 upstream df60cee26a2e 9fe51b7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_file_splice_read / shmem_write_end
* Struck through repros no longer work on HEAD.