From: bugzilla-daemon@kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 220760] New: Observed data-race in _find_next_bit+0x42/0xf0
Date: Fri, 07 Nov 2025 08:10:19 +0000 [thread overview]
Message-ID: <bug-220760-13602@https.bugzilla.kernel.org/> (raw)
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@kernel-bugs.osdl.org
Reporter: parsishashank351@gmail.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@0xfe210000 port 0xfe210100
irq 34 lpm-pol 1 ext
[ 356.712481] ata4: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210180
irq 34 lpm-pol 1 ext
[ 356.712531] ata5: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210200
irq 34 lpm-pol 1 ext
[ 356.712545] ata6: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210280
irq 34 lpm-pol 1 ext
[ 356.712559] ata7: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210300
irq 34 lpm-pol 1 ext
[ 356.712572] ata8: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210380
irq 34 lpm-pol 1 ext
[ 356.712596] ata9: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210400
irq 34 lpm-pol 1 ext
[ 356.712674] ata10: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210480
irq 34 lpm-pol 1 ext
[ 356.712687] ata11: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210500
irq 34 lpm-pol 1 ext
[ 356.712701] ata12: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210580
irq 34 lpm-pol 1 ext
[ 356.712770] ata13: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210600
irq 34 lpm-pol 1 ext
[ 356.712784] ata14: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210680
irq 34 lpm-pol 1 ext
[ 356.712798] ata15: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210700
irq 34 lpm-pol 1 ext
[ 356.712812] ata16: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210780
irq 34 lpm-pol 1 ext
[ 356.712826] ata17: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210800
irq 34 lpm-pol 1 ext
[ 356.712840] ata18: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210880
irq 34 lpm-pol 1 ext
[ 356.712914] ata19: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210900
irq 34 lpm-pol 1 ext
[ 356.712928] ata20: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210980
irq 34 lpm-pol 1 ext
[ 356.712942] ata21: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210a00
irq 34 lpm-pol 1 ext
[ 356.712955] ata22: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210a80
irq 34 lpm-pol 1 ext
[ 356.712968] ata23: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210b00
irq 34 lpm-pol 1 ext
[ 356.713031] ata24: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210b80
irq 34 lpm-pol 1 ext
[ 356.713044] ata25: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210c00
irq 34 lpm-pol 1 ext
[ 356.713057] ata26: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210c80
irq 34 lpm-pol 1 ext
[ 356.713072] ata27: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210d00
irq 34 lpm-pol 1 ext
[ 356.713125] ata28: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210d80
irq 34 lpm-pol 1 ext
[ 356.713138] ata29: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210e00
irq 34 lpm-pol 1 ext
[ 356.713164] ata30: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210e80
irq 34 lpm-pol 1 ext
[ 356.713240] ata31: SATA max UDMA/133 abar m4096@0xfe210000 port 0xfe210f00
irq 34 lpm-pol 1 ext
[ 356.713253] ata32: SATA max UDMA/133 abar m4096@0xfe210000 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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