syzbot


KCSAN: data-race in block_uevent / inc_diskseq (2)

Status: upstream: reported on 2024/06/19 12:27
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+c147f9175ec6cc7bd73b@syzkaller.appspotmail.com
First crash: 305d, last: 8d22h
Discussions (4)
Title Replies (including bot) Last reply
[syzbot] Monthly block report (Mar 2025) 0 (1) 2025/03/24 18:56
[syzbot] Monthly block report (Oct 2024) 0 (1) 2024/10/16 15:35
[syzbot] Monthly block report (Jul 2024) 0 (1) 2024/07/15 11:51
[syzbot] [block?] KCSAN: data-race in block_uevent / inc_diskseq (2) 2 (3) 2024/06/19 18:49
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in block_uevent / inc_diskseq block 37 402d 498d 0/28 auto-obsoleted due to no activity on 2024/04/18 10:08

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

write to 0xffff888102217620 of 8 bytes by task 3921 on cpu 0:
 inc_diskseq+0x2c/0x40 block/genhd.c:1517
 disk_force_media_change+0xa7/0xf0 block/disk-events.c:297
 __loop_clr_fd drivers/block/loop.c:1192 [inline]
 lo_release+0x2d2/0x400 drivers/block/loop.c:1772
 bdev_release+0x3c6/0x420 block/bdev.c:-1
 blkdev_release+0x15/0x20 block/fops.c:660
 __fput+0x2ac/0x640 fs/file_table.c:465
 fput_close_sync+0xc0/0x110 fs/file_table.c:570
 __do_sys_close fs/open.c:1581 [inline]
 __se_sys_close fs/open.c:1566 [inline]
 __x64_sys_close+0x55/0xe0 fs/open.c:1566
 x64_sys_call+0x262b/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888102217620 of 8 bytes by task 3007 on cpu 1:
 block_uevent+0x31/0x50 block/genhd.c:1256
 dev_uevent+0x304/0x390 drivers/base/core.c:2674
 uevent_show+0x11e/0x210 drivers/base/core.c:2732
 dev_attr_show+0x3a/0xa0 drivers/base/core.c:2424
 sysfs_kf_seq_show+0x1a8/0x280 fs/sysfs/file.c:65
 kernfs_seq_show+0x7c/0x90 fs/kernfs/file.c:205
 seq_read_iter+0x2c8/0x970 fs/seq_file.c:230
 kernfs_fop_read_iter+0xc3/0x320 fs/kernfs/file.c:279
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x5e6/0x710 fs/read_write.c:570
 ksys_read+0xeb/0x1b0 fs/read_write.c:713
 __do_sys_read fs/read_write.c:722 [inline]
 __se_sys_read fs/read_write.c:720 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:720
 x64_sys_call+0x2a3b/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000000000d9 -> 0x00000000000000da

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3007 Comm: udevd Not tainted 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================

Crashes (81):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/11 15:59 upstream 900241a5cc15 94486846 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/04/05 08:47 upstream a52a3c18cdf3 c53ea9c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/04/03 02:16 upstream 92b71befc349 c799dfdd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/04/02 18:32 upstream acc4d5ff0b61 c799dfdd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/03/23 01:27 upstream 183601b78a9b c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/03/06 07:54 upstream bb2281fb05e5 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/03/02 08:21 upstream ece144f151ac c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/27 09:18 upstream 5394eea10651 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/21 15:30 upstream 334426094588 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/20 10:08 upstream 87a132e73910 50668798 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/19 19:16 upstream 6537cfb395f3 b257a9b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/15 20:59 upstream 496659003dac 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/08 03:42 upstream 7ee983c850b4 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/02 02:11 upstream cabb4685d57e 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/01 09:09 upstream 60c828cf80c0 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/02/01 00:47 upstream 69b8923f5003 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/30 08:01 upstream ebbb8be421ee afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/28 23:43 upstream 6d61a53dd6f5 f5427d7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/27 23:53 upstream 805ba04cb7cc 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/26 13:56 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/25 01:22 upstream 113691ce9f32 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/20 05:02 upstream 9528d418de4d f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/18 19:08 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/13 03:37 upstream be548645527a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/11 23:22 upstream b62cef9a5c67 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/08 03:42 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/06 16:32 upstream 9d89551994a4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2025/01/05 21:03 upstream 9244696b34f2 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/29 22:07 upstream 4099a71718b0 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/28 18:43 upstream fd0584d220fe d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/27 00:55 upstream d6ef8b40d075 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/26 08:27 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/22 20:09 upstream bcde95ce32b6 b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/18 20:07 upstream aef25be35d23 a0626d3a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/15 02:20 upstream a0e3919a2df2 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/10 22:34 upstream 7cb1b4663150 cfc402b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/08 08:35 upstream 7503345ac5f5 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/12/02 18:44 upstream e70140ba0d2b b499ea68 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/11/28 11:04 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/11/26 23:36 upstream 445d9f05fa14 e9a9a9f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/11/24 16:04 upstream 9f16d5e6f220 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/11/21 04:12 upstream 8f7c8b88bda4 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/09/08 11:29 upstream d1f2d51b711a 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/09/05 11:47 upstream c763c4339688 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/09/01 13:12 upstream 431c1646e1f8 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/31 06:19 upstream 20371ba12063 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/25 21:17 upstream 5be63fc19fca d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/23 05:21 upstream aa0743a22936 ce8a9099 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/05 09:46 upstream de9c2c66ad8e e35c337f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/05 03:46 upstream a5dbd76a8942 1786a2a8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/04 06:47 upstream defaf1a2113a 1786a2a8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/08/03 00:50 upstream 1c4246294c98 1786a2a8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/30 20:23 upstream 22f546873149 6fde257d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/29 13:08 upstream dc1c8034e31b 5187fc86 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/26 01:12 upstream 1722389b0d86 3f86dfed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/25 11:25 upstream c33ffdb70cc6 466a14e5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/22 18:35 upstream 933069701c1b df655b64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/21 03:20 upstream 3c3ff7be9729 b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/14 08:00 upstream d0d0cd380055 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/07/02 18:12 upstream 1dfe225e9af5 07f0a0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
2024/06/19 00:43 upstream 3d54351c64e8 639d6cdf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in block_uevent / inc_diskseq
* Struck through repros no longer work on HEAD.