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Message-ID: <bug-220760-13602@https.bugzilla.kernel.org/>
Date: Fri, 07 Nov 2025 08:10:19 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 220760] New: Observed  data-race in _find_next_bit+0x42/0xf0

https://bugzilla.kernel.org/show_bug.cgi?id=220760

            Bug ID: 220760
           Summary: Observed  data-race in _find_next_bit+0x42/0xf0
           Product: File System
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: parsishashank351@...il.com
        Regression: No

Created attachment 308913
  --> https://bugzilla.kernel.org/attachment.cgi?id=308913&action=edit
_find_next_bit+0x42/0xf0

Hello Team,
i have build linux kernel 6.17.7 by taking code from kernel.org and i have
enabled CONFIG_KCSAN in kernel config file and installed the kernel.
After the initial boot, i saw some concurrency issues in dmesg kernel ring
buffer.
Few are related to ACPI and few are related to timer subsystem.

ref dmesg log:
[  356.704237] BUG: KCSAN: data-race in _find_next_bit+0x42/0xf0

[  356.704264] race at unknown origin, with read to 0xffff88a9c0004230 of 8
bytes by interrupt on cpu 0:
[  356.704279]  _find_next_bit+0x42/0xf0
[  356.704297]  _nohz_idle_balance.isra.0+0x219/0x3a0
[  356.704317]  sched_balance_softirq+0x73/0x90
[  356.704335]  handle_softirqs+0xd8/0x310
[  356.704358]  __irq_exit_rcu+0x11a/0x140
[  356.704377]  irq_exit_rcu+0xe/0x20
[  356.704396]  sysvec_call_function_single+0x96/0xb0
[  356.704421]  asm_sysvec_call_function_single+0x1b/0x20
[  356.704440]  pv_native_safe_halt+0xb/0x10
[  356.704454]  arch_cpu_idle+0x9/0x10
[  356.704471]  default_idle_call+0x30/0x110
[  356.704489]  do_idle+0x203/0x240
[  356.704505]  cpu_startup_entry+0x2c/0x30
[  356.704520]  rest_init+0x121/0x140
[  356.704536]  start_kernel+0x9ed/0xe60
[  356.704559]  x86_64_start_reservations+0x18/0x30
[  356.704579]  x86_64_start_kernel+0xfe/0x150
[  356.704596]  common_startup_64+0x13e/0x141

[  356.704627] value changed: 0x000000009ffdfbfd -> 0x000000009ffdebfd

[  356.704645] Reported by Kernel Concurrency Sanitizer on:
[  356.704658] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.17.7 #4
PREEMPT(voluntary)
[  356.704678] Hardware name: VMware, Inc. VMware20,1/440BX Desktop Reference
Platform, BIOS VMW201.00V.23553139.B64.2403260940 03/26/2024
[  356.704690]
==================================================================
[  356.705780] scsi host28: ahci
[  356.707193] scsi host29: ahci
[  356.708567] scsi host30: ahci
[  356.709878] scsi host31: ahci
[  356.711303] scsi host32: ahci
[  356.712465] ata3: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210100
irq 34 lpm-pol 1 ext
[  356.712481] ata4: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210180
irq 34 lpm-pol 1 ext
[  356.712531] ata5: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210200
irq 34 lpm-pol 1 ext
[  356.712545] ata6: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210280
irq 34 lpm-pol 1 ext
[  356.712559] ata7: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210300
irq 34 lpm-pol 1 ext
[  356.712572] ata8: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210380
irq 34 lpm-pol 1 ext
[  356.712596] ata9: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210400
irq 34 lpm-pol 1 ext
[  356.712674] ata10: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210480
irq 34 lpm-pol 1 ext
[  356.712687] ata11: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210500
irq 34 lpm-pol 1 ext
[  356.712701] ata12: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210580
irq 34 lpm-pol 1 ext
[  356.712770] ata13: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210600
irq 34 lpm-pol 1 ext
[  356.712784] ata14: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210680
irq 34 lpm-pol 1 ext
[  356.712798] ata15: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210700
irq 34 lpm-pol 1 ext
[  356.712812] ata16: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210780
irq 34 lpm-pol 1 ext
[  356.712826] ata17: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210800
irq 34 lpm-pol 1 ext
[  356.712840] ata18: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210880
irq 34 lpm-pol 1 ext
[  356.712914] ata19: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210900
irq 34 lpm-pol 1 ext
[  356.712928] ata20: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210980
irq 34 lpm-pol 1 ext
[  356.712942] ata21: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210a00
irq 34 lpm-pol 1 ext
[  356.712955] ata22: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210a80
irq 34 lpm-pol 1 ext
[  356.712968] ata23: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210b00
irq 34 lpm-pol 1 ext
[  356.713031] ata24: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210b80
irq 34 lpm-pol 1 ext
[  356.713044] ata25: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210c00
irq 34 lpm-pol 1 ext
[  356.713057] ata26: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210c80
irq 34 lpm-pol 1 ext
[  356.713072] ata27: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210d00
irq 34 lpm-pol 1 ext
[  356.713125] ata28: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210d80
irq 34 lpm-pol 1 ext
[  356.713138] ata29: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210e00
irq 34 lpm-pol 1 ext
[  356.713164] ata30: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210e80
irq 34 lpm-pol 1 ext
[  356.713240] ata31: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210f00
irq 34 lpm-pol 1 ext
[  356.713253] ata32: SATA max UDMA/133 abar m4096@...e210000 port 0xfe210f80
irq 34 lpm-pol 1 ext
[  356.738288] usbcore: registered new interface driver usbhid
[  356.738300] usbhid: USB HID core driver
[  357.022742] ata27: SATA link down (SStatus 0 SControl 300)
[  357.022941] ata25: SATA link down (SStatus 0 SControl 300)
[  357.023093] ata22: SATA link down (SStatus 0 SControl 300)
[  357.023241] ata31: SATA link down (SStatus 0 SControl 300)
[  357.023373] ata13: SATA link down (SStatus 0 SControl 300)
[  357.023490] ata24: SATA link down (SStatus 0 SControl 300)
[  357.023618] ata20: SATA link down (SStatus 0 SControl 300)
[  357.023763] ata7: SATA link down (SStatus 0 SControl 300)
[  357.023994] ata18: SATA link down (SStatus 0 SControl 300)
[  357.024218] ata32: SATA link down (SStatus 0 SControl 300)
[  357.024352] ata19: SATA link down (SStatus 0 SControl 300)
[  357.024499] ata9: SATA link down (SStatus 0 SControl 300)
[  357.024712] ata6: SATA link down (SStatus 0 SControl 300)
[  357.024901] ata26: SATA link down (SStatus 0 SControl 300)
[  357.025010] ata12: SATA link down (SStatus 0 SControl 300)
[  357.025116] ata30: SATA link down (SStatus 0 SControl 300)
[  357.025308] ata17: SATA link down (SStatus 0 SControl 300)
[  357.025426] ata28: SATA link down (SStatus 0 SControl 300)
[  357.025544] ata4: SATA link down (SStatus 0 SControl 300)
[  357.025630] ata23: SATA link down (SStatus 0 SControl 300)
[  357.025760] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  357.025908] ata15: SATA link down (SStatus 0 SControl 300)
[  357.026035] ata16: SATA link down (SStatus 0 SControl 300)
[  357.026210] ata29: SATA link down (SStatus 0 SControl 300)
[  357.026322] ata21: SATA link down (SStatus 0 SControl 300)
[  357.026432] ata10: SATA link down (SStatus 0 SControl 300)
[  357.026631] ata5: SATA link down (SStatus 0 SControl 300)
[  357.026733] ata11: SATA link down (SStatus 0 SControl 300)
[  357.026848] ata8: SATA link down (SStatus 0 SControl 300)
[  357.027037] ata14: SATA link down (SStatus 0 SControl 300)
[  357.027222] ata3.00: ATAPI: VMware Virtual SATA CDRW Drive, 00000001, max
UDMA/33
[  357.027523] ata3.00: configured for UDMA/33
[  357.028728] scsi 3:0:0:0: CD-ROM            NECVMWar VMware SATA CD00 1.00
PQ: 0 ANSI: 5
[  357.030610] sr 3:0:0:0: [sr0] scsi3-mmc drive: 1x/1x writer dvd-ram cd/rw
xa/form2 cdda tray
[  357.030693] cdrom: Uniform CD-ROM driver Revision: 3.20
[  357.071982] sr 3:0:0:0: Attached scsi CD-ROM sr0
[  357.072960] sr 3:0:0:0: Attached scsi generic sg1 type 5
[  357.098035] input: VMware VMware Virtual USB Mouse as
/devices/pci0000:02/0000:02:01.0/usb1/1-1/1-1:1.0/0003:0E0F:0003.0001/input/input5
[  357.099472] hid-generic 0003:0E0F:0003.0001: input,hidraw0: USB HID v1.10
Mouse [VMware VMware Virtual USB Mouse] on usb-0000:02:01.0-1/input0
[  357.398735] fbcon: Taking over console
[  357.402271] Console: switching to colour frame buffer device 128x48
[  357.549114] EXT4-fs (sda4): mounted filesystem
574a78d5-a611-492b-a2fd-0fd9308f950d ro with ordered data mode. Quota mode:
none.
[  363.330092] systemd[1]: Inserted module 'autofs4'
[  363.381819] systemd[1]: systemd 249.11-0ubuntu3.16 running in system mode
(+PAM +AUDIT +SELINUX +APPARMOR +IMA +SMACK +SECCOMP +GCRYPT +GNUTLS +OPENSSL
+ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP
+LIBFDISK +PCRE2 -PWQUALITY -P11KIT -QRENCODE +BZIP2 +LZ4 +XZ +ZLIB +ZSTD
-XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
[  363.382132] systemd[1]: Detected virtualization vmware.
[  363.382510] systemd[1]: Detected architecture x86-64.

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