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KCSAN: data-race in bdev_statx / queue_limits_commit_update (2)

Status: moderation: reported on 2025/07/05 22:43
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+b3987a634290a5f1bd78@syzkaller.appspotmail.com
First crash: 323d, last: 8d05h
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision Error
5b3760fe-dd6e-419f-aa61-d4c6de202b11 assessment-security 💥 KCSAN: data-race in bdev_statx / queue_limits_commit_update (2) 2026/05/14 10:11 2026/05/14 10:11 2026/05/14 10:12 6ccb967e465e832a7bfd7a116ad00d52a0923a5d failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: 27% (25877/93697) Updating files: 28% (26236/93697) Updating files: 29% (27173/93697) Updating files: 30% (28110/93697) Updating files: 31% (29047/93697) Updating files: 32% (29984/93697) Updating files: 33% (30921/93697) Updating files: 34% (31857/93697) Updating files: 35% (32794/93697) Updating files: 36% (33731/93697) Updating files: 36% (34161/93697) Updating files: 37% (34668/93697) Updating files: 38% (35605/93697) Updating files: 39% (36542/93697) Updating files: 39% (37259/93697) Updating files: 39% (37353/93697) error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_11_0_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_11_0_3_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_11_0_3_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_11_5_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_11_5_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_12_0_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_12_0_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_12_1_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_12_1_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_0_default.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_1_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_1_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_2_1_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_2_1_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_4_1_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_4_1_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_4_2_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_4_2_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_4_3_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/gc/gc_9_4_3_sh_mask.h fatal: cannot create directory at 'drivers/gpu/drm/amd/include/asic_reg/gca': No space left on device
5055c7c0-649e-4989-9ccf-b95736aa06df repro ❓ KCSAN: data-race in bdev_statx / queue_limits_commit_update (2) 2026/03/06 10:18 2026/03/06 10:18 2026/03/06 10:25 31e9c887f7dc24e04b3ca70d0d54fc34141844b0
10813863-cdc5-40c5-a4ed-bfd5228d475c assessment-kcsan Benign: ✅ Confident: ✅ ❓ KCSAN: data-race in bdev_statx / queue_limits_commit_update (2) 2026/02/24 16:57 2026/02/24 16:57 2026/02/24 17:03 305c0ec5cd886e2d13738e28e1b2df9b0ec20fc9
0951449e-8589-4648-8418-65d6ec688724 assessment-kcsan 🏃 KCSAN: data-race in bdev_statx / queue_limits_commit_update (2) 2026/01/09 15:11 2026/01/09 15:11 9ee25c60da3366005e31dedd1574732f63338151
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in bdev_statx / queue_limits_commit_update block 6 1 381d 381d 0/29 auto-obsoleted due to no activity on 2025/07/03 18:51

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

read to 0xffff888101d3a450 of 4 bytes by task 4180 on cpu 1:
 queue_io_min include/linux/blkdev.h:1414 [inline]
 bdev_io_min include/linux/blkdev.h:1419 [inline]
 bdev_statx+0x295/0x2d0 block/bdev.c:1350
 vfs_getattr_nosec+0x1b6/0x1e0 fs/stat.c:227
 vfs_getattr fs/stat.c:262 [inline]
 vfs_fstat fs/stat.c:281 [inline]
 __do_sys_newfstat fs/stat.c:551 [inline]
 __se_sys_newfstat+0x96/0x460 fs/stat.c:546
 __x64_sys_newfstat+0x31/0x40 fs/stat.c:546
 x64_sys_call+0x2773/0x3020 arch/x86/include/generated/asm/syscalls_64.h:6
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888101d3a410 of 192 bytes by task 5000 on cpu 0:
 queue_limits_commit_update+0x4b/0x160 block/blk-settings.c:564
 loop_configure+0x78c/0x9c0 drivers/block/loop.c:1064
 lo_ioctl+0x1e1/0x13a0 drivers/block/loop.c:1534
 blkdev_ioctl+0x387/0x460 block/ioctl.c:797
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
 x64_sys_call+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5000 Comm: syz.0.422 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
==================================================================
loop0: detected capacity change from 0 to 512
ext4: Unknown parameter 'noacl'

Crashes (34):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/16 23:13 upstream 6916d5703ddf de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/05/10 03:34 upstream e92b2872d0b1 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/04/29 22:49 upstream 57b8e2d666a3 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/04/29 20:14 upstream 57b8e2d666a3 7ca9e4d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/04/24 02:38 upstream 45dcf5e28813 9cfb3ca7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/04/17 04:49 upstream 3cd8b194bf34 de0a551d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/04/16 03:20 upstream aec2f682d47c df15c5f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/04/06 18:49 upstream 591cd656a1bf 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/03/31 14:52 upstream d0c3bcd5b897 aeea1c72 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/03/29 03:22 upstream cbfffcca2bf0 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/03/22 22:12 upstream ec69c9e88315 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/03/12 06:39 upstream 80234b5ab240 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/03/11 02:08 upstream b4f0dd314b39 86914af9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/02/27 19:21 upstream a75cb869a8cc 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/02/25 22:50 upstream d9d32e5bd5a4 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/02/08 01:50 upstream e7aa57247700 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/02/06 12:55 upstream b7ff7151e653 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/01/30 13:44 upstream 4d310797262f ae7dc18c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/01/29 23:08 upstream 8dfce8991b95 aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2026/01/06 04:23 upstream 7f98ab9da046 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/12/15 11:48 upstream 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/11/18 08:29 upstream e7c375b18160 ef766cd7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/11/14 15:39 upstream 6da43bbeb691 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/11/04 18:05 upstream c9cfc122f037 686bf657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/10/29 06:31 upstream 8eefed8f65cc fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/10/07 07:59 upstream c746c3b51698 8ef35d49 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/10/01 00:41 upstream 30d4efb2f5a5 65a0eece .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/09/21 05:10 upstream 3b08f56fbbb9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/09/20 13:07 upstream cd89d487374c 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/09/10 20:21 upstream 7aac71907bde fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/08/03 05:33 upstream 186f3edfdd41 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/07/27 10:48 upstream ec2df4364666 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/07/23 01:50 upstream 89be9a83ccf1 8e9d1dc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
2025/07/05 22:43 upstream 05df91921da6 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in bdev_statx / queue_limits_commit_update
* Struck through repros no longer work on HEAD.