ci2 starts bisection 2026-11-01 11:30:09.932336028 +0000 UTC m=+34700.246214919
bisecting fixing commit since cf82dcca96346600c7068cf3f841335f9fa08f54
building syzkaller on 4e8b1cc684b6a13aa7e5ae999c1ddfc8a900f2ba
ensuring issue is reproducible on original commit cf82dcca96346600c7068cf3f841335f9fa08f54

testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: 9f903772e84e91c871701a3f35906d32aee71f4a1581c9747176e73fdff54e55
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
check whether we can drop unnecessary instrumentation
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: e701f6de030ef16d68442e91f6d670aee06a67b5de9b995a36029702c9fb5688
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
the bug reproduces without the instrumentation
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
kconfig minimization: base=7508 full=9788 leaves diff=2007
split chunks (needed=false): <2007>
split chunk #0 of len 2007 into 5 parts
testing without sub-chunk 1/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: 2147981d4c9766c96b8e6797bdf039920c6bcbec77f98efc195629dd7f69e90f
all runs: OK
false negative chance: 0.000
testing without sub-chunk 2/5
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: d72e98356d5b7179e53da52e41311e0ccbbc46e24ccb9dfbf6072c09c56a0ebb
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: df3edcb4578e48b3d24f05e9a90c4aad7e693e7446b0bb4969828f4e7487feb3
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: df5df59bf59e8a822edc42caf3e8b611e9b49b809dd3cc375ffa2a27c6f21e34
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit cf82dcca96346600c7068cf3f841335f9fa08f54 gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: 85a8d2025705b78ddea378016f23304557e587effc68fc16f353d87b80c58d76
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
the chunk can be dropped
minimized to 402 configs; suspects: [6LOWPAN 6LOWPAN_GHC_EXT_HDR_DEST 6LOWPAN_GHC_EXT_HDR_FRAG 6LOWPAN_GHC_EXT_HDR_HOP 6LOWPAN_GHC_EXT_HDR_ROUTE 6LOWPAN_GHC_ICMPV6 6LOWPAN_GHC_UDP 6LOWPAN_NHC 6LOWPAN_NHC_DEST 6LOWPAN_NHC_FRAGMENT 6LOWPAN_NHC_HOP 6LOWPAN_NHC_IPV6 6LOWPAN_NHC_MOBILITY 6LOWPAN_NHC_ROUTING 6LOWPAN_NHC_UDP 6PACK 842_COMPRESS 842_DECOMPRESS 9P_FSCACHE 9P_FS_POSIX_ACL 9P_FS_SECURITY ACORN_PARTITION ACORN_PARTITION_ADFS ACORN_PARTITION_CUMANA ACORN_PARTITION_EESOX ACORN_PARTITION_ICS ACORN_PARTITION_POWERTEC ACORN_PARTITION_RISCIX ACPI_DOCK ADFS_FS AFFS_FS AFS_FS AFS_FSCACHE AF_KCM AF_RXRPC AF_RXRPC_IPV6 AIX_PARTITION AMIGA_PARTITION ANDROID_BINDERFS ANDROID_BINDER_IPC ANON_VMA_NAME APPLE_MFI_FASTCHARGE AR5523 ARM64_ERRATUM_4118414 ARM_SDE_INTERFACE ASM_MODVERSIONS ASYNC_CORE ASYNC_MEMCPY ASYNC_PQ ASYNC_RAID6_RECOV ASYNC_TX_DMA ASYNC_XOR ATARI_PARTITION ATA_GENERIC ATA_OVER_ETH ATA_PIIX ATH10K ATH10K_CE ATH10K_PCI ATH10K_SNOC ATH10K_USB ATH11K ATH11K_AHB ATH11K_PCI ATH6KL ATH6KL_USB ATH9K ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_CHANNEL_CONTEXT ATH9K_COMMON ATH9K_COMMON_DEBUG ATH9K_COMMON_SPECTRAL ATH9K_DEBUGFS ATH9K_DYNACK ATH9K_HTC ATH9K_HTC_DEBUGFS ATH9K_HW ATH9K_PCI ATH9K_PCOEM ATH9K_RFKILL ATH_COMMON ATM ATM_BR2684 ATM_CLIP ATM_DRIVERS ATM_LANE ATM_MPOA ATM_TCP AX25 AX25_DAMA_SLAVE BAREUDP BATMAN_ADV BATMAN_ADV_BATMAN_V BATMAN_ADV_BLA BATMAN_ADV_DAT BATMAN_ADV_MCAST BATMAN_ADV_NC BCACHE BCMA BCMA_HOST_PCI_POSSIBLE BEFS_FS BFQ_CGROUP_DEBUG BFQ_GROUP_IOSCHED BFS_FS BIG_KEYS BINFMT_MISC BLK_CGROUP_IOCOST BLK_CGROUP_IOLATENCY BLK_CGROUP_RWSTAT BLK_DEBUG_FS_ZONED BLK_DEV_NULL_BLK BLK_DEV_NULL_BLK_FAULT_INJECTION BLK_DEV_RAM BLK_DEV_RNBD BLK_DEV_RNBD_CLIENT BLK_DEV_SR BLK_DEV_THROTTLING BLK_DEV_UBLK BLK_DEV_ZONED BLK_ICQ BLK_INLINE_ENCRYPTION BLK_INLINE_ENCRYPTION_FALLBACK BLK_MQ_RDMA BLK_RQ_ALLOC_TIME BLK_WBT BLK_WBT_MQ BONDING BPF_JIT_ALWAYS_ON BPQETHER BRIDGE_CFM BRIDGE_EBT_802_3 BRIDGE_EBT_AMONG BRIDGE_EBT_ARP BRIDGE_EBT_ARPREPLY BRIDGE_EBT_BROUTE BRIDGE_EBT_DNAT BRIDGE_EBT_IP BRIDGE_EBT_IP6 BRIDGE_EBT_LIMIT BRIDGE_EBT_LOG BRIDGE_EBT_MARK BRIDGE_EBT_MARK_T BRIDGE_EBT_NFLOG BRIDGE_EBT_PKTTYPE BRIDGE_EBT_REDIRECT BRIDGE_EBT_SNAT BRIDGE_EBT_STP BRIDGE_EBT_T_FILTER BRIDGE_EBT_T_NAT BRIDGE_EBT_VLAN BRIDGE_MRP BRIDGE_NF_EBTABLES BSD_DISKLABEL BTRFS_ASSERT BTRFS_FS_REF_VERIFY BT_6LOWPAN BT_ATH3K BT_BNEP BT_BNEP_MC_FILTER BT_BNEP_PROTO_FILTER BT_CMTP BT_HCIBCM203X BT_HCIBFUSB BT_HCIBPA10X BT_HCIBTUSB_AUTOSUSPEND BT_HCIBTUSB_MTK BT_HCIUART_3WIRE BT_HCIUART_AG6XX BT_HCIUART_BCSP BT_HCIVHCI BT_LE BT_MSFTEXT BT_MTK BT_RFCOMM BT_RFCOMM_TTY CACHEFILES CAIF CAIF_DEBUG CAIF_DRIVERS CAIF_NETDEV CAIF_TTY CAIF_USB CAIF_VIRTIO CAN_8DEV_USB CAN_EMS_USB CAN_ESD_USB CAN_ETAS_ES58X CAN_GS_USB CAN_IFI_CANFD CAN_ISOTP CAN_J1939 CAN_KVASER_USB CAN_MCBA_USB CAN_PEAK_USB CAN_SLCAN CAN_UCAN CAN_VCAN CAN_VXCAN CAPI_TRACE CARL9170 CARL9170_HWRNG CARL9170_LEDS CARL9170_WPC CDROM CEC_CORE CEC_NOTIFIER CEPH_FS CEPH_FSCACHE CEPH_FS_POSIX_ACL CEPH_LIB CEPH_LIB_USE_DNS_RESOLVER CFG80211 CFG80211_CRDA_SUPPORT CFG80211_DEBUGFS CFG80211_DEFAULT_PS CFG80211_REQUIRE_SIGNED_REGDB CFG80211_USE_KERNEL_REGDB_KEYS CFG80211_WEXT CFS_BANDWIDTH CGROUP_NET_CLASSID CGROUP_NET_PRIO CGROUP_RDMA CHARGER_BQ24190 CHARGER_ISP1704 CHECKPOINT_RESTORE CHECK_SIGNATURE CHR_DEV_SG CHR_DEV_ST CIFS CIFS_ALLOW_INSECURE_LEGACY CIFS_DEBUG CIFS_DFS_UPCALL CIFS_FSCACHE CIFS_POSIX CIFS_SMB_DIRECT CIFS_SWN_UPCALL CIFS_UPCALL CIFS_XATTR CLS_U32_MARK CLS_U32_PERF CMDLINE_PARTITION COMEDI COMEDI_8254 COMEDI_8255 COMEDI_8255_PCI COMEDI_8255_SA COMEDI_ADL_PCI9118 COMEDI_BOND COMEDI_DT9812 COMEDI_KCOMEDILIB COMEDI_MISC_DRIVERS COMEDI_NI_DAQ_700_CS COMEDI_NI_LABPC COMEDI_NI_LABPC_CS COMEDI_NI_LABPC_PCI COMEDI_NI_USB6501 COMEDI_PARPORT COMEDI_PCI_DRIVERS COMEDI_PCMCIA_DRIVERS COMEDI_TEST COMEDI_USBDUX COMEDI_USBDUXFAST COMEDI_USBDUXSIGMA COMEDI_USB_DRIVERS COMEDI_VMK80XX COMPAT_NETLINK_MESSAGES CONNECTOR COUNTER CPU_FREQ_DEFAULT_GOV_USERSPACE CRAMFS CRAMFS_BLOCKDEV CRAMFS_MTD CRC4 CRYPTO_ADIANTUM CRYPTO_AEGIS128 CRYPTO_AES_ARM64 CRYPTO_AES_TI CRYPTO_ANUBIS CRYPTO_ARC4 CRYPTO_ARCH_HAVE_LIB_POLY1305 CRYPTO_ARIA CRYPTO_BLOWFISH CRYPTO_BLOWFISH_COMMON CRYPTO_CAMELLIA CRYPTO_CHACHA20 CRYPTO_CHACHA20POLY1305 CRYPTO_CRC32 CRYPTO_CTS CRYPTO_DEV_CCP CRYPTO_DEV_CCP_DD CRYPTO_DEV_VIRTIO CRYPTO_DRBG_CTR CRYPTO_DRBG_HASH CRYPTO_ECRDSA CRYPTO_ESSIV CRYPTO_FCRYPT CRYPTO_HCTR2 CRYPTO_KDF800108_CTR CRYPTO_KEYWRAP CRYPTO_KHAZAD CRYPTO_LIB_ARC4 CRYPTO_LIB_CHACHA CRYPTO_LIB_CHACHA20POLY1305 CRYPTO_LIB_CURVE25519 CRYPTO_LIB_POLY1305 CRYPTO_LIB_POLY1305_GENERIC CRYPTO_LRW CRYPTO_NHPOLY1305 CRYPTO_PCBC CRYPTO_PCRYPT CRYPTO_POLY1305 CRYPTO_POLY1305_NEON CRYPTO_POLYVAL CRYPTO_RMD160 CRYPTO_SEED CRYPTO_SEQIV CRYPTO_SM2 CRYPTO_SM4_ARM64_CE CRYPTO_SM4_ARM64_CE_BLK CRYPTO_SM4_ARM64_NEON_BLK CRYPTO_STREEBOG CRYPTO_TEA CRYPTO_TWOFISH CRYPTO_TWOFISH_COMMON CRYPTO_USER CRYPTO_USER_API_AEAD CRYPTO_USER_API_HASH CRYPTO_USER_API_SKCIPHER CRYPTO_VMAC CRYPTO_WP512 CRYPTO_XCBC CRYPTO_XCTR CYPRESS_FIRMWARE DAMON DAMON_DBGFS DAMON_PADDR DAMON_RECLAIM DAMON_VADDR DAX DCB DEFAULT_CUBIC DEFAULT_PFIFO_FAST DEVICE_MIGRATION DEVICE_PRIVATE DLN2_ADC DMABUF_HEAPS DMABUF_HEAPS_CMA DMABUF_HEAPS_SYSTEM DMABUF_MOVE_NOTIFY DM_AUDIT DM_BIO_PRISON DM_BUFIO DM_CACHE DM_CACHE_SMQ DM_CLONE DM_CRYPT DM_FLAKEY DM_INTEGRITY DM_MULTIPATH DM_MULTIPATH_QL DM_MULTIPATH_ST DM_PERSISTENT_DATA DM_RAID DM_SNAPSHOT DM_THIN_PROVISIONING DM_UEVENT DM_VERITY DM_VERITY_FEC DM_WRITECACHE DM_ZONED DRAGONRISE_FF DRM DRM_ANALOGIX_DP DRM_BOCHS DRM_BRIDGE DRM_CDNS_MHDP8546 DRM_CDNS_MHDP8546_J721E DRM_CIRRUS_QEMU DRM_DEBUG_MM DRM_DISPLAY_CONNECTOR DRM_DISPLAY_DP_HELPER DRM_DISPLAY_HDCP_HELPER DRM_DISPLAY_HDMI_HELPER DRM_DISPLAY_HELPER DRM_DP_AUX_BUS DRM_DW_HDMI DRM_DW_HDMI_AHB_AUDIO DRM_DW_HDMI_CEC DRM_DW_HDMI_I2S_AUDIO DRM_DW_MIPI_DSI DRM_ETNAVIV DRM_ETNAVIV_THERMAL DRM_EXYNOS DRM_EXYNOS5433_DECON DRM_EXYNOS7_DECON DRM_EXYNOS_DSI DRM_EXYNOS_HDMI DRM_EXYNOS_MIC DRM_FBDEV_EMULATION DRM_GEM_DMA_HELPER DRM_GEM_SHMEM_HELPER DRM_GM12U320 DRM_GUD DRM_HDLCD DRM_HISI_HIBMC DRM_HISI_KIRIN DRM_I2C_ADV7511 DRM_I2C_ADV7511_AUDIO DRM_I2C_ADV7511_CEC DRM_I2C_CH7006 DRM_I2C_NXP_TDA998X DRM_I2C_SIL164 DRM_IMX_DCSS DRM_KMS_HELPER DRM_KOMEDA DRM_LEGACY DRM_LIMA DRM_LONTIUM_LT8912B DRM_LONTIUM_LT9611 DRM_LONTIUM_LT9611UXC DRM_MALI_DISPLAY DRM_MEDIATEK DRM_MEDIATEK_HDMI DRM_MESON DRM_MESON_DW_HDMI DRM_MIPI_DSI DRM_MSM DRM_MSM_DP DRM_MSM_DPU DRM_MSM_DSI DRM_MSM_DSI_10NM_PHY DRM_MSM_DSI_14NM_PHY DRM_MSM_DSI_20NM_PHY DRM_MSM_DSI_28NM_8960_PHY DRM_MSM_DSI_28NM_PHY DRM_MSM_DSI_7NM_PHY DRM_MSM_GPU_STATE DRM_MSM_HDMI DRM_MSM_HDMI_HDCP DRM_MSM_MDP4 DRM_MSM_MDP5 DRM_MSM_MDSS DRM_MXS DRM_MXSFB DRM_NOMODESET DRM_NOUVEAU DRM_NOUVEAU_BACKLIGHT DRM_NWL_MIPI_DSI DRM_PANEL DRM_PANEL_BOE_TV101WUM_NL6 DRM_PANEL_BRIDGE DRM_PANEL_EDP DRM_PANEL_LVDS DRM_PANEL_MANTIX_MLAF057WE51 DRM_PANEL_RAYDIUM_RM67191 DRM_PANEL_SIMPLE DRM_PANEL_SITRONIX_ST7703 DRM_PANEL_TRULY_NT35597_WQXGA DRM_PANFROST DRM_PARADE_PS8640 DRM_PL111 DRM_RCAR_CMM DRM_RCAR_DU DRM_RCAR_DW_HDMI DRM_RCAR_LVDS DRM_RCAR_MIPI_DSI DRM_RCAR_USE_CMM DRM_RCAR_USE_LVDS DRM_RCAR_USE_MIPI_DSI DRM_RCAR_VSP DRM_RCAR_WRITEBACK DRM_SCHED DRM_SII902X DRM_SIMPLEDRM DRM_SIMPLE_BRIDGE DRM_SUN4I DRM_SUN6I_DSI DRM_SUN8I_DW_HDMI DRM_SUN8I_MIXER DRM_SUN8I_TCON_TOP DRM_TEGRA ENCRYPTED_KEYS FSCACHE HAMRADIO HID_DRAGONRISE INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISDN ISDN_CAPI MAC80211 MAC80211_LEDS MFD_DLN2 NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED PCCARD PCMCIA RFKILL SND SND_SOC SOUND TCP_CONG_ADVANCED TLS TLS_DEVICE TRUSTED_KEYS WEXT_CORE WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ATH ZONE_DEVICE]
disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed
testing current HEAD 08889840163ebcdb7e24bf7ec311bc2e6fc3aaea
testing commit 08889840163ebcdb7e24bf7ec311bc2e6fc3aaea gcc
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
kernel signature: bf62a5e8b9ef9eea36da7b01473be84428ce904229b721b2e255d9dbdac6a0c3
all runs: crashed: WARNING in btrfs_init_new_device
representative crash: WARNING in btrfs_init_new_device, types: [WARNING]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 2h38m29.462923016s (build: 58m7.861584285s, test: 1h28m51.177761516s)
crash still not fixed or there were kernel test errors
commit msg: Linux 6.1.191
crash: WARNING in btrfs_init_new_device
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589
BTRFS warning (device loop1): creating sysfs device link for devid 2 failed: -17
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4105 at fs/btrfs/volumes.c:2958 btrfs_init_new_device+0x868/0xa5c fs/btrfs/volumes.c:2958
Modules linked in:
CPU: 0 PID: 4105 Comm: syz.1.32 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : btrfs_init_new_device+0x868/0xa5c fs/btrfs/volumes.c:2958
lr : btrfs_init_new_device+0x868/0xa5c fs/btrfs/volumes.c:2958
sp : ffff800013a0bd10
x29: ffff800013a0bd30 x28: 0000000000000000 x27: ffff0000c4a85000
x26: ffff0000c4511200 x25: 00000000ffffffef x24: ffff0000c40f3000
x23: ffff0000c5ecd008 x22: 0000000000000000 x21: ffff0000c7108000
x20: ffff0000c2e3f800 x19: ffff0000c04e8a80 x18: ffff80000afc0bb7
x17: 0000000000000001 x16: ffffffffffffffff x15: 0000000000000003
x14: ffff80000b6874f8 x13: 0000000000000003 x12: 0000000000000003
x11: 00000000ffffdfff x10: ffff80000b5f2be4 x9 : 5333a12e2bcf8d00
x8 : 5333a12e2bcf8d00 x7 : 0000000000000000 x6 : ffff80000a27a448
x5 : 0000000000000000 x4 : 0000000000000080 x3 : 0000000000000000
x2 : 0000000000000000 x1 : ffff80000afc0bb7 x0 : 0000000000000026
Call trace:
 btrfs_init_new_device+0x868/0xa5c fs/btrfs/volumes.c:2958
 btrfs_ioctl_add_dev+0xac/0x174 fs/btrfs/ioctl.c:3611
 btrfs_ioctl+0x8c0/0x944 fs/btrfs/ioctl.c:5570
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x88/0xc8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x40/0xdc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0xb0/0xe8 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x24/0x80 arch/arm64/kernel/syscall.c:204
 el0_svc+0x34/0xd4 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589
---[ end trace 0000000000000000 ]---
BTRFS: error (device loop1: state A) in btrfs_init_new_device:2958: errno=-17 Object already exists
BTRFS info (device loop1: state EA): forced readonly