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KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list (5)

Status: moderation: reported on 2023/12/08 00:06
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+442f65aa520459a25521@syzkaller.appspotmail.com
First crash: 507d, last: 7h56m
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list (4) block 2 710d 711d 0/26 auto-closed as invalid on 2022/04/19 11:06
upstream KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list (3) block 1 758d 758d 0/26 auto-closed as invalid on 2022/03/02 19:51
upstream KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list block 2 1597d 1598d 0/26 closed as invalid on 2019/10/18 14:11
upstream KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list (2) block 1741 844d 1541d 0/26 auto-closed as invalid on 2021/12/06 01:22

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

read to 0xffff888101014cf8 of 4 bytes by task 44 on cpu 1:
 blk_mq_update_dispatch_busy block/blk-mq.c:1919 [inline]
 blk_mq_dispatch_rq_list+0xcb3/0x10a0 block/blk-mq.c:2170
 __blk_mq_sched_dispatch_requests+0x1ce/0xd20 block/blk-mq-sched.c:301
 blk_mq_sched_dispatch_requests+0x78/0xe0 block/blk-mq-sched.c:331
 blk_mq_run_hw_queue+0x298/0x4c0 block/blk-mq.c:2285
 blk_mq_run_hw_queues+0x15b/0x1e0 block/blk-mq.c:2334
 scsi_starved_list_run drivers/scsi/scsi_lib.c:428 [inline]
 scsi_run_queue+0x4aa/0x5b0 drivers/scsi/scsi_lib.c:451
 scsi_requeue_run_queue+0x25/0x30 drivers/scsi/scsi_lib.c:464
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

write to 0xffff888101014cf8 of 4 bytes by task 2514 on cpu 0:
 blk_mq_dispatch_rq_list+0xf55/0x10a0
 __blk_mq_sched_dispatch_requests+0x1ce/0xd20 block/blk-mq-sched.c:301
 blk_mq_sched_dispatch_requests+0x78/0xe0 block/blk-mq-sched.c:331
 blk_mq_run_hw_queue+0x298/0x4c0 block/blk-mq.c:2285
 blk_mq_get_tag+0x479/0x590 block/blk-mq-tag.c:170
 __blk_mq_alloc_requests+0x63c/0xa40 block/blk-mq.c:500
 blk_mq_get_new_requests block/blk-mq.c:2905 [inline]
 blk_mq_submit_bio+0x417/0xe30 block/blk-mq.c:3001
 __submit_bio+0x11c/0x350 block/blk-core.c:608
 __submit_bio_noacct_mq block/blk-core.c:687 [inline]
 submit_bio_noacct_nocheck+0x449/0x5e0 block/blk-core.c:716
 submit_bio_noacct+0x67d/0x830 block/blk-core.c:826
 submit_bio+0x212/0x220 block/blk-core.c:868
 ext4_io_submit+0x8a/0xa0 fs/ext4/page-io.c:378
 ext4_do_writepages+0xb3a/0x2100 fs/ext4/inode.c:2699
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2768
 do_writepages+0x1c2/0x340 mm/page-writeback.c:2553
 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 __filemap_fdatawrite mm/filemap.c:427 [inline]
 filemap_flush+0x95/0xc0 mm/filemap.c:454
 ext4_alloc_da_blocks+0x50/0x130 fs/ext4/inode.c:3072
 ext4_release_file+0x5f/0x1c0 fs/ext4/file.c:169
 __fput+0x299/0x630 fs/file_table.c:376
 ____fput+0x15/0x20 fs/file_table.c:404
 task_work_run+0x135/0x1a0 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x604/0x16d0 kernel/exit.c:871
 do_group_exit+0x101/0x150 kernel/exit.c:1020
 get_signal+0xf4e/0x10a0 kernel/signal.c:2893
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x9c/0x130 kernel/entry/common.c:225
 irqentry_exit+0x12/0x40 kernel/entry/common.c:328
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x00000009 -> 0x00000007

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2514 Comm: syz-executor.3 Not tainted 6.8.0-rc5-syzkaller-00163-gffd2cb6b718e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================

Crashes (158):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/23 13:31 upstream ffd2cb6b718e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/22 11:17 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/20 11:45 upstream b401b621758e 3af7dd65 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/14 08:57 upstream 7e90b5c295ec d902085f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/12 06:00 upstream 841c35169323 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/09 21:11 upstream e6f39a90de92 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/06 16:33 upstream 99bd3cb0d12e 6404acf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/06 03:02 upstream 54be6c6c5ae8 6404acf9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/02 02:43 upstream 5c24e4e9e708 d61103fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/02/01 18:13 upstream 6764c317b6bb 81024119 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/31 16:05 upstream 1bbb19b6eb1b 373b66cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/30 23:01 upstream 861c0981648f 7f400fcb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/29 06:01 upstream 4854cf9c61d0 cc4a4020 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/25 14:48 upstream 6098d87eaf31 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/23 16:40 upstream 5d9248eed480 1c0ecc51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/17 19:15 upstream 052d534373b7 c9a1c95b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/15 13:28 upstream 052d534373b7 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/12 20:06 upstream 70d201a40823 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/08 19:49 upstream 0dd3ee311255 4c0fd4bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2024/01/03 03:38 upstream 610a9b8f49fb fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/31 14:11 upstream 453f5db0619e fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/30 08:27 upstream f016f7547aee fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/26 14:12 upstream fbafc3e621c3 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/21 03:22 upstream 1a44b0073b92 de21eb89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/19 23:54 upstream 55cb5f43689d 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/19 18:36 upstream 2cf4f94d8e86 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/18 13:35 upstream ceb6a6f023fd 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/18 03:51 upstream 0e389834672c 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/17 14:17 upstream 3b8a9b2e6809 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/15 23:38 upstream 3f7168591ebf 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/12 18:28 upstream 26aff849438c ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/12 03:41 upstream 26aff849438c 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/10 05:21 upstream b10a3ccaf6e3 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/07 12:52 upstream bee0e7762ad2 0a02ce36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/05 04:04 upstream bee0e7762ad2 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/12/01 13:50 upstream 994d5c58e50e f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/29 08:47 upstream 18d46e76d7c2 1adfb6f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/24 20:29 upstream f1a09972a45a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/23 04:17 upstream 9b6de136b5f0 fc59b78e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/22 04:48 upstream c2d5304e6c64 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/19 21:48 upstream 037266a5f723 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/19 00:30 upstream 23dfa043f6d5 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/18 04:39 upstream 791c8ab095f7 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/17 03:55 upstream 7475e51b8796 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/14 03:58 upstream 9bacdd8996c7 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/10 16:34 upstream 89cdf9d55601 45e9b83e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/11/09 13:27 upstream 6bc986ab839c 4862372a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/10/31 15:24 upstream 5a6a09e97199 58499c95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/10/30 16:27 upstream ffc253263a13 b5729d82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/10/29 02:23 upstream 51a7691038c3 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2023/10/27 23:03 upstream 750b95887e56 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
2022/10/04 00:59 upstream 4fe89d07dcc2 feb56351 .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
* Struck through repros no longer work on HEAD.