syzbot


KCSAN: data-race in shmem_getpage_gfp / shmem_write_end

Status: auto-obsoleted due to no activity on 2022/11/15 02:39
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+9b7038569bf2cea1082a@syzkaller.appspotmail.com
First crash: 1607d, last: 525d

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

write to 0xffff8881393f9a88 of 8 bytes by task 467 on cpu 0:
 i_size_write include/linux/fs.h:886 [inline]
 shmem_write_end+0x59/0x380 mm/shmem.c:2535
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3756
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3873
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3905
 do_iter_write+0x494/0x750 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x235/0x430 fs/read_write.c:1031
 __do_sys_pwritev fs/read_write.c:1078 [inline]
 __se_sys_pwritev fs/read_write.c:1073 [inline]
 __x64_sys_pwritev+0x54/0x60 fs/read_write.c:1073
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881393f9a88 of 8 bytes by task 28382 on cpu 1:
 i_size_read include/linux/fs.h:864 [inline]
 shmem_getpage_gfp+0x1a3/0x1750 mm/shmem.c:1854
 shmem_getpage mm/shmem.c:150 [inline]
 shmem_file_read_iter+0x161/0x6c0 mm/shmem.c:2592
 do_iter_read+0x492/0x760 fs/read_write.c:796
 vfs_iter_read+0x4c/0x70 fs/read_write.c:838
 lo_read_simple drivers/block/loop.c:290 [inline]
 do_req_filebacked drivers/block/loop.c:500 [inline]
 loop_handle_cmd drivers/block/loop.c:1864 [inline]
 loop_process_work+0x783/0x1340 drivers/block/loop.c:1899
 loop_rootcg_workfn+0x1b/0x20 drivers/block/loop.c:1930
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

value changed: 0x00000000008f1000 -> 0x00000000008f2000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28382 Comm: kworker/u4:1 Not tainted 6.0.0-syzkaller-10145-ge2302539dd4f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: loop5 loop_rootcg_workfn
==================================================================

Crashes (660):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/11 02:39 upstream e2302539dd4f 5bcf0c31 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/10 17:36 upstream 493ffd6605b2 5bcf0c31 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/10 06:13 upstream 4899a36f91a9 aea5da89 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/09 17:31 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/08 08:06 upstream 62e6e5940c0c aea5da89 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/07 20:11 upstream 4c86114194e6 79a59635 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/05 04:29 upstream 0326074ff465 267e3bb1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/04 15:15 upstream 725737e7c21d eab8f949 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/04 12:17 upstream 4fe89d07dcc2 978d1f19 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/02 21:10 upstream a962b54e162c feb56351 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/02 09:06 upstream b357fd1c2afc feb56351 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/10/01 15:43 upstream ffb4d94b4314 feb56351 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/29 18:39 upstream c3e0e1e23c70 45fd7169 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/28 20:52 upstream 49c13ed0316d a41a2080 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/28 02:13 upstream 46452d3786a8 75c78242 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/27 07:25 upstream 3800a713b607 10323ddf .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/27 03:38 upstream 3800a713b607 d59ba983 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/26 23:33 upstream f76349cf4145 d59ba983 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/25 04:57 upstream 1a61b828566f 0042f2b4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/24 19:22 upstream a63f2e7cb110 0042f2b4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/23 11:09 upstream dc164f4fb00a 0042f2b4 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/21 21:21 upstream 06f7db949993 380f82fb .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/19 03:39 upstream 38eddeedbbea dd9a85ff .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/17 06:56 upstream a335366bad13 dd9a85ff .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/17 00:01 upstream 6879c2d3b960 dd9a85ff .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/15 08:57 upstream 3245cb65fd91 dd9a85ff .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/13 14:50 upstream d1221cea11fc a08652b0 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/13 09:53 upstream e839a756012b a08652b0 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/12 23:50 upstream e839a756012b f371ed7e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/12 17:06 upstream 80e78fcce86d f371ed7e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/10 20:15 upstream b96fbd602d35 356d8217 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/10 09:46 upstream ce888220d5c7 356d8217 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/09 13:14 upstream 9b4509495418 90058bdc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/09 11:43 upstream 506357871c18 90058bdc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/08 14:51 upstream 26b1224903b3 f3027468 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/06 22:58 upstream d2ec799d1c1b 5fc30c37 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/05 11:47 upstream 7e18e42e4b28 922294ab .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/05 01:35 upstream 7e18e42e4b28 28811d0a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/02 15:57 upstream 42e66b1cc3a0 25194605 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/02 05:01 upstream 42e66b1cc3a0 a805568e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/09/01 06:56 upstream c5e4d5e99162 b01ec571 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/31 17:21 upstream dcf8e5633e2e 51e54e30 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/30 18:35 upstream dcf8e5633e2e 4a380809 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/29 12:19 upstream b90cb1053190 94da0b6b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/27 18:32 upstream 89b749d8552d 07177916 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/27 06:53 upstream e022620b5d05 07177916 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/23 11:21 upstream 072e51356cd5 cea8b0f7 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/21 22:46 upstream e3f259d33c0e 26a13b38 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/21 08:19 upstream 15b3f48a4339 26a13b38 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/20 20:15 upstream f31c32efd57c 26a13b38 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2022/08/20 00:36 upstream 50cd95ac4654 26a13b38 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
2021/01/16 04:49 upstream 5ee88057889b 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2020/02/02 23:47 https://github.com/google/ktsan.git kcsan 245a43005292 93e5e335 .config console log report ci2-upstream-kcsan-gce
2020/02/01 07:18 https://github.com/google/ktsan.git kcsan 245a43005292 0eb59c27 .config console log report ci2-upstream-kcsan-gce
2019/10/24 11:19 https://github.com/google/ktsan.git kcsan 05f2236801fe d01bb02a .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.