ci2 starts bisection 2026-10-26 17:55:17.692787284 +0000 UTC m=+21208.926206570 bisecting cause commit starting from 21a7f44fd0765fcc5194130b28767786eba1d1e7 building syzkaller on 1d9ca40bc8cea3cf514fa7fbd790c9dec89521a0 ensuring issue is reproducible on original commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: c7c4dbd16a0d7e70e8869b533a09880ae7cb04fec0f315b79f61acca4a9c2129 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: fe0c6afcd2360c978ba7a257a67ec7d7a5f543f5b738a9f5d351b118406eb0bb all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed kconfig minimization: base=4206 full=8508 leaves diff=2103 split chunks (needed=false): <2103> split chunk #0 of len 2103 into 5 parts testing without sub-chunk 1/5 disabling configs for [kasan atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: b1b1a82ad9cce457caeffac0d7d5cc5152b2b353b57829565a044c8eea4c2dd9 all runs: OK false negative chance: 0.000 testing without sub-chunk 2/5 disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: bd6a4f876d5391af81591f70215cae2a5a148b4f73d152f488a13e4ceefc2091 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 5a94e375fccc0be51caad94db09f400a72443ca773d1e5b95211e0ceca6ace74 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: dd910f4c2bca9b4406d1e196f84b49094462038ed5abba191af91952c3701146 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing commit 21a7f44fd0765fcc5194130b28767786eba1d1e7 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: fd89f41803f30c8b4f102a547a8f5dfdb8e560a14e92b96e9c127cb9d3356e36 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] the chunk can be dropped minimized to 421 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 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_NFIT ACPI_NHLT ADFS_FS AFFS_FS AFS_FS AFS_FSCACHE AF_KCM AF_RXRPC AF_RXRPC_IPV6 AIX_PARTITION AMD_SFH_HID AMIGA_PARTITION ANON_VMA_NAME APERTURE_HELPERS APPLE_MFI_FASTCHARGE AR5523 ARCH_HAS_DEBUG_WX ARCH_HAS_USER_SHADOW_STACK ASM_MODVERSIONS ASUS_TF103C_DOCK ASYNC_CORE ASYNC_MEMCPY ASYNC_PQ ASYNC_RAID6_RECOV ASYNC_TX_DMA ASYNC_XOR ATARI_PARTITION ATA_GENERIC ATA_OVER_ETH ATH10K ATH10K_CE ATH10K_LEDS ATH10K_PCI ATH10K_USB ATH11K 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_DRIVERS AX88796B_PHY BALLOON BAREUDP BATMAN_ADV BATMAN_ADV_BATMAN_V BATMAN_ADV_BLA BATMAN_ADV_DAT BATMAN_ADV_MCAST BCACHE BCMA BCMA_HOST_PCI_POSSIBLE BEFS_FS BFQ_CGROUP_DEBUG BFQ_GROUP_IOSCHED BIG_KEYS BINFMT_MISC_BPF BLKDEV_UBLK_LEGACY_OPCODES BLK_CGROUP_PUNT_BIO BLK_CGROUP_RWSTAT BLK_DEV_BSGLIB BLK_DEV_INTEGRITY BLK_DEV_NBD BLK_DEV_NULL_BLK BLK_DEV_NULL_BLK_FAULT_INJECTION BLK_DEV_NVME BLK_DEV_PMEM BLK_DEV_RAM BLK_DEV_RNBD BLK_DEV_RNBD_CLIENT BLK_DEV_THROTTLING BLK_DEV_UBLK BLK_DEV_ZONED BLK_ERROR_INJECTION BLK_ICQ BLK_INLINE_ENCRYPTION BLK_INLINE_ENCRYPTION_FALLBACK BLK_WBT BLK_WBT_MQ BONDING BOOT_VESA_SUPPORT BPF_CRYPTO BPF_EVENTS BPF_JIT BPF_JIT_ALWAYS_ON BPF_JIT_DEFAULT_ON BPF_JIT_KASAN BPF_LSM BPF_PRELOAD BPF_PRELOAD_UMD BPF_SYSCALL BRIDGE BRIDGE_CFM BRIDGE_EBT_802_3 BRIDGE_EBT_AMONG BRIDGE_EBT_ARP BRIDGE_EBT_ARPREPLY 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_VLAN BRIDGE_IGMP_SNOOPING BRIDGE_MRP BRIDGE_NF_EBTABLES BRIDGE_VLAN_FILTERING BSD_DISKLABEL BSD_PROCESS_ACCT_V3 BT BTRFS_ASSERT BTRFS_FS BTRFS_FS_POSIX_ACL BTT BT_6LOWPAN BT_ATH3K BT_BCM BT_BNEP BT_BNEP_MC_FILTER BT_BNEP_PROTO_FILTER BT_BREDR BT_HCIBCM203X BT_HCIBFUSB BT_HCIBPA10X BT_HCIBTUSB BT_HCIBTUSB_AUTOSUSPEND BT_HCIBTUSB_BCM BT_HCIBTUSB_MTK BT_HCIBTUSB_POLL_SYNC BT_HCIBTUSB_RTL BT_HCIUART BT_HCIUART_3WIRE BT_HCIUART_AG6XX BT_HCIUART_BCSP BT_HCIUART_H4 BT_HCIUART_LL BT_HCIUART_MRVL BT_HCIUART_QCA BT_HCIUART_SERDEV BT_HCIVHCI BT_INTEL BT_LE BT_LEDS BT_LE_L2CAP_ECRED BT_MRVL BT_MRVL_SDIO BT_MSFTEXT BT_MTK BT_MTKSDIO BT_MTKUART BT_QCA BT_RFCOMM BT_RFCOMM_TTY BT_RTL CACHEFILES CAN CAN_8DEV_USB CAN_BCM CAN_CALC_BITTIMING CAN_DEV CAN_EMS_USB CAN_ESD_USB CAN_ETAS_ES58X CAN_F81604 CAN_GS_USB CAN_GW CAN_IFI_CANFD CAN_ISOTP CAN_J1939 CAN_KVASER_USB CAN_MCBA_USB CAN_NETLINK CAN_PEAK_USB CAN_RAW CAN_RX_OFFLOAD CAN_SLCAN CAN_UCAN CAN_VCAN CAN_VIRTIO_CAN CAN_VXCAN CARL9170 CARL9170_HWRNG CARL9170_LEDS CARL9170_WPC CC_HAS_MFENTRY CEC_CORE 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 CHARGER_ISP1704 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 CLOSURES CLS_U32_MARK CLS_U32_PERF CMA CMA_SIZE_SEL_MAX CMDLINE_PARTITION COMEDI COMEDI_8254 COMEDI_8255 COMEDI_8255_PCI COMEDI_8255_SA COMEDI_ADL_PCI9118 COMEDI_ADQ12B COMEDI_AIO_AIO12_8 COMEDI_AIO_IIRO_16 COMEDI_AMPLC_DIO200 COMEDI_AMPLC_DIO200_ISA COMEDI_AMPLC_PC236 COMEDI_AMPLC_PC236_ISA COMEDI_AMPLC_PC263_ISA COMEDI_BOND COMEDI_C6XDIGIO COMEDI_DAC02 COMEDI_DAS08 COMEDI_DAS08_ISA COMEDI_DAS16M1 COMEDI_DAS1800 COMEDI_DAS6402 COMEDI_DAS800 COMEDI_DMM32AT COMEDI_DT2801 COMEDI_DT2811 COMEDI_DT2814 COMEDI_DT2815 COMEDI_DT2817 COMEDI_DT282X COMEDI_DT9812 COMEDI_FL512 COMEDI_ISADMA COMEDI_ISA_DRIVERS COMEDI_KCOMEDILIB COMEDI_MISC_DRIVERS COMEDI_MPC624 COMEDI_MULTIQ3 COMEDI_NI_ATMIO16D COMEDI_NI_AT_A2150 COMEDI_NI_AT_AO COMEDI_NI_DAQ_700_CS COMEDI_NI_LABPC COMEDI_NI_LABPC_CS COMEDI_NI_LABPC_ISA COMEDI_NI_LABPC_ISADMA COMEDI_NI_LABPC_PCI COMEDI_NI_USB6501 COMEDI_PARPORT COMEDI_PCI_DRIVERS COMEDI_PCL711 COMEDI_PCL724 COMEDI_PCL726 COMEDI_PCL730 COMEDI_PCL812 COMEDI_PCL816 COMEDI_PCL818 COMEDI_PCM3724 COMEDI_PCMAD COMEDI_PCMCIA_DRIVERS COMEDI_PCMDA12 COMEDI_PCMMIO COMEDI_PCMUIO COMEDI_RTI800 COMEDI_RTI802 COMEDI_S526 COMEDI_TEST COMEDI_USBDUX COMEDI_USBDUXFAST COMEDI_USBDUXSIGMA COMEDI_USB_DRIVERS COMEDI_VMK80XX COMPAT_NETLINK_MESSAGES COREBOOT_FIRMWARE COREBOOT_MEMCONSOLE COREBOOT_MEMCONSOLE_COMMON COREBOOT_TABLE COUNTER CRAMFS CRAMFS_BLOCKDEV CRAMFS_MTD CRC64 CRC64_ARCH CRC8 CRC_ITU_T CRC_T10DIF CRC_T10DIF_ARCH CRYPTO_842 CRYPTO_ACOMP CRYPTO_ADIANTUM CRYPTO_AEGIS128 CRYPTO_AEGIS128_AESNI_SSE2 CRYPTO_AES_NI_INTEL CRYPTO_ANUBIS CRYPTO_ARC4 CRYPTO_ARIA CRYPTO_ARIA_AESNI_AVX_X86_64 CRYPTO_BLOWFISH CRYPTO_BLOWFISH_COMMON CRYPTO_BLOWFISH_X86_64 CRYPTO_CAMELLIA_AESNI_AVX2_X86_64 CRYPTO_CAMELLIA_AESNI_AVX_X86_64 CRYPTO_CAMELLIA_X86_64 CRYPTO_CAST5 CRYPTO_CAST5_AVX_X86_64 CRYPTO_CAST6 CRYPTO_CAST6_AVX_X86_64 CRYPTO_CAST_COMMON CRYPTO_CHACHA20 CRYPTO_CHACHA20POLY1305 CRYPTO_DEFLATE CRYPTO_DES CRYPTO_DEV_CCP CRYPTO_DEV_CCP_DD CRYPTO_DEV_PADLOCK CRYPTO_DEV_PADLOCK_AES CRYPTO_DEV_PADLOCK_SHA CRYPTO_DEV_QAT CRYPTO_DEV_QAT_C3XXX CRYPTO_DEV_QAT_C3XXXVF CRYPTO_DEV_QAT_C62X CRYPTO_DEV_QAT_C62XVF CRYPTO_DEV_QAT_DH895xCC CRYPTO_DEV_QAT_DH895xCCVF CRYPTO_DEV_VIRTIO CRYPTO_DH CRYPTO_ECC CRYPTO_ECDH CRYPTO_ECRDSA CRYPTO_ENGINE CRYPTO_ESSIV CRYPTO_HCTR2 CRYPTO_KDF800108_CTR CRYPTO_KHAZAD CRYPTO_KPP CRYPTO_KPP2 CRYPTO_LIB_AES_XTS CRYPTO_LIB_ARC4 CRYPTO_LIB_BLAKE2B CRYPTO_LIB_CHACHA CRYPTO_LIB_CHACHA20POLY1305 CRYPTO_LIB_CHACHA_ARCH CRYPTO_LIB_CURVE25519 CRYPTO_LIB_CURVE25519_ARCH CRYPTO_LIB_CURVE25519_GENERIC CRYPTO_LIB_DES CRYPTO_LIB_GF128MUL CRYPTO_LIB_NH CRYPTO_LIB_NH_ARCH CRYPTO_LIB_POLY1305 CRYPTO_LIB_POLY1305_ARCH CRYPTO_LIB_POLY1305_GENERIC CRYPTO_LRW CRYPTO_LZ4HC CRYPTO_NULL CRYPTO_PCRYPT CRYPTO_RMD160 CRYPTO_RNG CRYPTO_RNG2 CRYPTO_SEED CRYPTO_SERPENT CRYPTO_SERPENT_AVX2_X86_64 CRYPTO_SERPENT_AVX_X86_64 CRYPTO_SERPENT_SSE2_X86_64 CRYPTO_SHA3 CRYPTO_SM4 CRYPTO_SM4_AESNI_AVX2_X86_64 CRYPTO_SM4_AESNI_AVX_X86_64 CRYPTO_SM4_GENERIC CRYPTO_STREEBOG CRYPTO_TEA CRYPTO_TWOFISH CRYPTO_TWOFISH_AVX_X86_64 CRYPTO_TWOFISH_COMMON CRYPTO_TWOFISH_X86_64 CRYPTO_TWOFISH_X86_64_3WAY CRYPTO_USER CRYPTO_USER_API CRYPTO_USER_API_AEAD CRYPTO_USER_API_ENABLE_OBSOLETE CRYPTO_USER_API_HASH CRYPTO_USER_API_RNG CRYPTO_USER_API_SKCIPHER CRYPTO_WP512 CRYPTO_XCBC CRYPTO_XCTR CRYPTO_XTS CRYPTO_ZSTD CUSE CYPRESS_FIRMWARE DAMON DAMON_PADDR DAMON_RECLAIM DAMON_VADDR DAX DCA DCB DEBUG_INFO_BTF DEFAULT_CODEL DEVFREQ_GOV_SIMPLE_ONDEMAND DEVICE_MIGRATION DEVICE_PRIVATE DEV_COREDUMP DIBS DIBS_LO DLN2_ADC DMABUF_HEAPS DMABUF_HEAPS_CMA DMABUF_HEAPS_SYSTEM DMA_CMA DMA_ENGINE_RAID DM_AUDIT DM_BIO_PRISON DM_BUFIO DM_CACHE DM_CACHE_SMQ DM_CLONE DM_CRYPT DM_FLAKEY DM_INLINECRYPT 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_ACCEL DRM_AUX_BRIDGE DRM_BRIDGE ENCRYPTED_KEYS FSCACHE FUSE_FS GPIOLIB HID_DRAGONRISE IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_RTRS_CLIENT IOSCHED_BFQ ISA_BUS LIBNVDIMM MAC80211 MAC80211_DEBUGFS MAC80211_LEDS MEDIA_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MMC MODVERSIONS MTD NET_CLS_U32 NET_SCH_DEFAULT PARTITION_ADVANCED PCCARD PCMCIA PM_DEVFREQ RFKILL SERIAL_DEV_BUS TLS TLS_DEVICE TRUSTED_KEYS USB_GADGET USB_PHY VLAN_8021Q WANT_COMPAT_NETLINK_MESSAGES WEXT_CORE WIRELESS WLAN WLAN_VENDOR_ATH ZONE_DEVICE] disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed picked [v7.3 v7.2 v7.1 v6.19 v6.17 v6.15 v6.13 v6.11 v6.8 v6.5 v6.2 v5.19 v5.16 v5.13 v5.10 v5.7 v5.4 v5.1 v4.19] out of 46 release tags testing release v7.3 testing commit c03c1a14507dfaf8b856c2608f9ac216021fc222 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 335cb92a86e4a1969601ae29656ff42990f75d90792744bd439598d4c5faae98 all runs: OK false negative chance: 0.000 # git bisect start 21a7f44fd0765fcc5194130b28767786eba1d1e7 c03c1a14507dfaf8b856c2608f9ac216021fc222 Bisecting: 7577 revisions left to test after this (roughly 13 steps) [c5fd5e67c7812bc40cd897422c1e0d6dd9ed1e2e] Merge tag 'mm-stable-2026-10-19-21-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm testing commit c5fd5e67c7812bc40cd897422c1e0d6dd9ed1e2e gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 2c78df4ad40604b35ea9db2ab934afcae69614a10abce16ef7cd215c2331a115 all runs: OK false negative chance: 0.000 # git bisect good c5fd5e67c7812bc40cd897422c1e0d6dd9ed1e2e Bisecting: 3482 revisions left to test after this (roughly 12 steps) [5b0764a53235d3c77e1ed674e836e1b3fe1a4b1f] Merge tag 'drm-next-2026-10-21' of https://gitlab.freedesktop.org/drm/kernel testing commit 5b0764a53235d3c77e1ed674e836e1b3fe1a4b1f gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 48331839fef02fdb41b958e6db79d044ec35fa0372cfea20fbb718c3cb52046d all runs: OK false negative chance: 0.000 # git bisect good 5b0764a53235d3c77e1ed674e836e1b3fe1a4b1f Bisecting: 2180 revisions left to test after this (roughly 11 steps) [0dfc0090b925243490b5b71bc9a229517cda499a] Merge tag 'fbdev-for-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev testing commit 0dfc0090b925243490b5b71bc9a229517cda499a gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: bd4c6c7f86292a8bdb6ab119b01a3ffa5b771c88aba809801d7eebedbb10ac9f all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] # git bisect bad 0dfc0090b925243490b5b71bc9a229517cda499a Bisecting: 682 revisions left to test after this (roughly 9 steps) [cb8fef4b07f71da01843457b66e579ad248a625e] Merge tag 'tty-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty testing commit cb8fef4b07f71da01843457b66e579ad248a625e gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 14069853c4453db6aa934bcb153188baf0944c0ffd3ef8209ba9381d36822d18 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] # git bisect bad cb8fef4b07f71da01843457b66e579ad248a625e Bisecting: 363 revisions left to test after this (roughly 8 steps) [b23545529c21737dd7939e86b6f649f06480796d] Merge tag 'for-7.4/block-20261021' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux testing commit b23545529c21737dd7939e86b6f649f06480796d gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 3f083f6ff8e44cc5575976614dcb0f2b7fd9f9b98be34fc16e4ae030a0df4c70 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] # git bisect bad b23545529c21737dd7939e86b6f649f06480796d Bisecting: 127 revisions left to test after this (roughly 7 steps) [f06ca594eafcdf58a399a0f92480631192e06032] ublk: reset the FETCH round in release also without a disk testing commit f06ca594eafcdf58a399a0f92480631192e06032 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 351309ef021e48a8f3a7b0e1e4b60d31d26d840929a8801cc7e7b833cf5c3670 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] # git bisect bad f06ca594eafcdf58a399a0f92480631192e06032 Bisecting: 63 revisions left to test after this (roughly 6 steps) [7ac697d4a08f01e7aefdeb1f3e1d6f71b2cdac0d] rnull: fix geometry store check-then-act across lock scopes testing commit 7ac697d4a08f01e7aefdeb1f3e1d6f71b2cdac0d gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 4ae9e09482c717285d2543574965698464a9b5e2f5560517aae77744b9e5b0a0 all runs: OK false negative chance: 0.000 # git bisect good 7ac697d4a08f01e7aefdeb1f3e1d6f71b2cdac0d Bisecting: 32 revisions left to test after this (roughly 5 steps) [aaf49023041bc1f887a028a164d3bac714b65508] ublk: hold RCU read lock in ublk_try_buf_match() testing commit aaf49023041bc1f887a028a164d3bac714b65508 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: db46357a15d6cd679b46c3a808cd3346a381af042ce09702a48c0d7deb447bd1 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] # git bisect bad aaf49023041bc1f887a028a164d3bac714b65508 Bisecting: 15 revisions left to test after this (roughly 4 steps) [e1274a6bc40a4618f6fbaebbdc51cca865d51bed] aoe: pull in the headers each received packet type reads testing commit e1274a6bc40a4618f6fbaebbdc51cca865d51bed gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 0b0f86c747fc24a32328683bc94e427ca978801002125ab779404a2c8538d249 all runs: OK false negative chance: 0.000 # git bisect good e1274a6bc40a4618f6fbaebbdc51cca865d51bed Bisecting: 7 revisions left to test after this (roughly 3 steps) [d16519a561f4ccc2cebbf52831435833cac1fec6] block: honor IOCB_NOWAIT in the block device buffered read path testing commit d16519a561f4ccc2cebbf52831435833cac1fec6 gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: a18813bb592246236ad3edd8c6b866800119ca6afb65ccc4255b2fc10f19b082 all runs: OK false negative chance: 0.000 # git bisect good d16519a561f4ccc2cebbf52831435833cac1fec6 Bisecting: 3 revisions left to test after this (roughly 2 steps) [b91a661514f3a3ce5add42fc1f2eb17b61eacaca] block: unpin all pages of a bvec in bio_iov_iter_align_down() testing commit b91a661514f3a3ce5add42fc1f2eb17b61eacaca gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 53b805b58a153934a0ff0572414d78cf7e66329cb38e096be95ede5cb99dfd15 all runs: OK false negative chance: 0.000 # git bisect good b91a661514f3a3ce5add42fc1f2eb17b61eacaca Bisecting: 1 revision left to test after this (roughly 1 step) [a08bf4b9f87898628e70882430b8dd4260730dba] block: reject NOWAIT buffered write fallback testing commit a08bf4b9f87898628e70882430b8dd4260730dba gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 9a705179431c3e54969613be76513c3236416f713f5520ea466fe07e84649b55 all runs: OK false negative chance: 0.000 # git bisect good a08bf4b9f87898628e70882430b8dd4260730dba Bisecting: 0 revisions left to test after this (roughly 0 steps) [1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad] block: take the inode lock for buffered write fallback testing commit 1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad gcc compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 kernel signature: 39728219ab5e4dcbab19acfdaf9ba2dc3a97301ff9632079f3268d9a40a01574 all runs: crashed: possible deadlock in blkdev_buffered_write representative crash: possible deadlock in blkdev_buffered_write, types: [LOCKDEP] # git bisect bad 1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad 1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad is the first bad commit commit 1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad Author: Julian Sun Date: Thu Oct 15 17:11:05 2026 +0800 block: take the inode lock for buffered write fallback Commit c0e473a0d226 ("block: fix race between set_blocksize and read paths") added shared inode locking around ordinary buffered writes, but missed the direct-I/O fallback path. Move the lock into blkdev_buffered_write() so both paths serialize with set_blocksize(). Also correct the comment claiming that this path takes invalidate_lock; it only takes i_rwsem. Fixes: c0e473a0d226 ("block: fix race between set_blocksize and read paths") Signed-off-by: Julian Sun Link: https://patch.msgid.link/20261015091105.1315605-3-sunjunchao@bytedance.com Signed-off-by: Jens Axboe block/fops.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) accumulated error probability: 0.00 culprit signature: 39728219ab5e4dcbab19acfdaf9ba2dc3a97301ff9632079f3268d9a40a01574 parent signature: 9a705179431c3e54969613be76513c3236416f713f5520ea466fe07e84649b55 revisions tested: 21, total time: 6h20m59.043423993s (build: 2h17m2.150079919s, test: 3h0m48.948646887s) first bad commit: 1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad block: take the inode lock for buffered write fallback recipients (to): ["axboe@kernel.dk" "sunjunchao@bytedance.com"] recipients (cc): [] crash: possible deadlock in blkdev_buffered_write ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.2.17/3401 is trying to acquire lock: ffff8881105ca8e8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] ffff8881105ca8e8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_buffered_write+0x28/0x70 block/fops.c:728 but task is already holding lock: ffff8881105ca8e8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] ffff8881105ca8e8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_write_iter+0x1e3/0x220 block/fops.c:805 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sb->s_type->i_mutex_key#9); lock(&sb->s_type->i_mutex_key#9); *** DEADLOCK *** May be due to missing lock nesting notation locks held by syz.2.17/3401: 1, last CPU#0: #0: ffff8881105ca8e8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff8881105ca8e8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_write_iter+0x1e3/0x220 block/fops.c:805 stack backtrace: CPU: 0 UID: 0 PID: 3401 Comm: syz.2.17 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0x6d/0xa0 lib/dump_stack.c:120 print_deadlock_bug+0x27c/0x2c0 kernel/locking/lockdep.c:3085 check_deadlock kernel/locking/lockdep.c:3137 [inline] validate_chain kernel/locking/lockdep.c:3939 [inline] __lock_acquire+0x11aa/0x2340 kernel/locking/lockdep.c:5288 lock_acquire+0xea/0x2a0 kernel/locking/lockdep.c:5942 down_read+0x2c/0x100 kernel/locking/rwsem.c:1574 inode_lock_shared include/linux/fs.h:1039 [inline] blkdev_buffered_write+0x28/0x70 block/fops.c:728 blkdev_write_iter+0x1ee/0x220 block/fops.c:806 do_iter_readv_writev+0x194/0x1e0 fs/read_write.c:-1 vfs_writev+0x1d4/0x3c0 fs/read_write.c:1058 do_writev+0x74/0x110 fs/read_write.c:1104 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x104/0x400 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc0dde7f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc0dd4d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fc0de105fa0 RCX: 00007fc0dde7f559 RDX: 0000000000000002 RSI: 0000200000000100 RDI: 0000000000000003 RBP: 00007fc0ddf16b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc0de106038 R14: 00007fc0de105fa0 R15: 00007ffd0c59a308