ci2 starts bisection 2025-08-12 04:56:41.019574935 +0000 UTC m=+37420.018570118 bisecting fixing commit since 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 building syzkaller on e2f27c3515f1d25672dedf92071bf6d40f623969 ensuring issue is reproducible on original commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: f4f522761cae3fd51120391c399c9325ac990c05114f48862d219a5e7da0b171 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: c8d9de7b872b4fdd6a7ec5a67e4d1e9322f10368b3a75183ca92cfeda090bd5f all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed kconfig minimization: base=3829 full=7502 leaves diff=2069 split chunks (needed=false): <2069> split chunk #0 of len 2069 into 5 parts testing without sub-chunk 1/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 9ac73d26473faaec06dcd657dcebeb2d8feb6645cb18e197b5826ef30b019785 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 24087d3f20a72166c9f504f73cd0772eec42813d77d6e61067e19d4ca28d869a all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: fabb819bce6211cb07bfa6205165b735b9bcbdc24ae3d98f130ba74e2e596fd0 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 3153f202ec21fa200237510e23b12ba7fc43530bec1a1c003ad488da01ce829f all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed testing commit 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 91bff6b1b21510efbffc2f567a140dd793929301242480607a72e312e4e35caf all runs: OK false negative chance: 0.000 minimized to 413 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE 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USB_SERIAL_BELKIN USB_SERIAL_CH341 USB_SERIAL_CONSOLE USB_SERIAL_CP210X USB_SERIAL_CYBERJACK USB_SERIAL_CYPRESS_M8 USB_SERIAL_DEBUG USB_SERIAL_DIGI_ACCELEPORT USB_SERIAL_EDGEPORT USB_SERIAL_EDGEPORT_TI USB_SERIAL_EMPEG USB_SERIAL_F81232 USB_SERIAL_F8153X USB_SERIAL_FTDI_SIO USB_SERIAL_GARMIN USB_SERIAL_GENERIC USB_SERIAL_IPAQ USB_SERIAL_IPW USB_SERIAL_IR USB_SERIAL_IUU USB_SERIAL_KEYSPAN USB_SERIAL_KEYSPAN_PDA USB_SERIAL_KLSI USB_SERIAL_KOBIL_SCT USB_SERIAL_MCT_U232 USB_SERIAL_METRO USB_SERIAL_MOS7715_PARPORT USB_SERIAL_MOS7720 USB_SERIAL_MOS7840 USB_SERIAL_MXUPORT USB_SERIAL_NAVMAN USB_SERIAL_OMNINET USB_SERIAL_OPTICON USB_SERIAL_OPTION USB_SERIAL_OTI6858 USB_SERIAL_PL2303 USB_SERIAL_QCAUX USB_SERIAL_QT2 USB_SERIAL_QUALCOMM USB_SERIAL_SAFE USB_SERIAL_SIERRAWIRELESS USB_SERIAL_SIMPLE USB_SERIAL_SPCP8X5 USB_SERIAL_SSU100 USB_SERIAL_SYMBOL USB_SERIAL_TI USB_SERIAL_UPD78F0730 USB_SERIAL_VISOR USB_SERIAL_WHITEHEAT USB_SERIAL_WISHBONE USB_SERIAL_WWAN USB_SERIAL_XR USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_U132_HCD USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PCI_RENESAS USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_IOMMU_TYPE1 VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_VDPA VHOST_VSOCK VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOMODE_HELPERS VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_STK1160_COMMON VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_X2APIC XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XILLYBUS_CLASS XILLYUSB XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZBUD ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD] disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed testing current HEAD 3594f306da129190de25938b823f353ef7f9e322 testing commit 3594f306da129190de25938b823f353ef7f9e322 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 8a470e5b64c89b4542096707ba24af7d069201fae7b5861bda90f8fda76894fd all runs: OK false negative chance: 0.000 # git bisect start 3594f306da129190de25938b823f353ef7f9e322 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 Bisecting: 445 revisions left to test after this (roughly 9 steps) [38d767fb4a7766ec2058f97787e4c6e8d10343d6] jffs2: check jffs2_prealloc_raw_node_refs() result in few other places determine whether the revision contains the guilty commit revision 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 crashed and is reachable testing commit 38d767fb4a7766ec2058f97787e4c6e8d10343d6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 679418b1a2533226adf91fc77771c4e4fc88be2ec5b36149497f1fb9e0bf18ae all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 38d767fb4a7766ec2058f97787e4c6e8d10343d6 Bisecting: 222 revisions left to test after this (roughly 8 steps) [7141f9e827038acb7f36fc9bf6786d0461ff6922] drm/exynos: fimd: Guard display clock control with runtime PM calls determine whether the revision contains the guilty commit revision 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 crashed and is reachable testing commit 7141f9e827038acb7f36fc9bf6786d0461ff6922 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 22984d77f6d5391fe3a259bd58214ba6e62a80e0ca42ccaedfa92cd86ff6b31c all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 7141f9e827038acb7f36fc9bf6786d0461ff6922 Bisecting: 111 revisions left to test after this (roughly 7 steps) [91fa560c73a8126868848ed6cd70607cbf8d87e2] nbd: fix uaf in nbd_genl_connect() error path determine whether the revision contains the guilty commit revision 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 crashed and is reachable testing commit 91fa560c73a8126868848ed6cd70607cbf8d87e2 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: b33a04520a48385cc20bf1c71c90e59c0eac56fc43bf8c5ef6b1962d0413b82a all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 91fa560c73a8126868848ed6cd70607cbf8d87e2 Bisecting: 55 revisions left to test after this (roughly 6 steps) [9a88afbb69784cb321266f80495692254f84378b] mmc: sdhci-pci: Quirk for broken command queuing on Intel GLK-based Positivo models determine whether the revision contains the guilty commit revision 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 crashed and is reachable testing commit 9a88afbb69784cb321266f80495692254f84378b gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: c64e4afce67a2ac3edc4e0bdae30619f0de9b08e9b1fc5e5be2582205c44aa7e all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good 9a88afbb69784cb321266f80495692254f84378b Bisecting: 27 revisions left to test after this (roughly 5 steps) [ac3a8147bb24314fb3e84986590148e79f9872ec] Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb() determine whether the revision contains the guilty commit revision 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 crashed and is reachable testing commit ac3a8147bb24314fb3e84986590148e79f9872ec gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: c1bda454649310eb4b480b52d2ea238edcfae3ed19c366b69a8fdc0ab503d5ec all runs: OK false negative chance: 0.000 # git bisect bad ac3a8147bb24314fb3e84986590148e79f9872ec Bisecting: 13 revisions left to test after this (roughly 4 steps) [d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3] comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large determine whether the revision contains the guilty commit revision 38d767fb4a7766ec2058f97787e4c6e8d10343d6 crashed and is reachable testing commit d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 4333fb4c88f323b25e9a9d8980020ede3173dd7846e556837e6c9b7afd2053e0 all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 Bisecting: 6 revisions left to test after this (roughly 3 steps) [466e10194ab81caa2ee6a332d33ba16bcceeeba6] net/sched: sch_qfq: Fix race condition on qfq_aggregate determine whether the revision contains the guilty commit revision 7141f9e827038acb7f36fc9bf6786d0461ff6922 crashed and is reachable testing commit 466e10194ab81caa2ee6a332d33ba16bcceeeba6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: a9eccc2f5d69e2a724db9bd2b014003b0bdabbb2c4219399b94d4d9d89095438 run #0: ignore: lost connection to test machine run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK false negative chance: 0.000 # git bisect bad 466e10194ab81caa2ee6a332d33ba16bcceeeba6 Bisecting: 3 revisions left to test after this (roughly 2 steps) [d3436638738ace8f101af7bdee2eae1bc38e9b29] comedi: Fix initialization of data for instructions that write to subdevice determine whether the revision contains the guilty commit revision 58485ff1a74f6c5be9e7c6aafb7293e4337348e7 crashed and is reachable testing commit d3436638738ace8f101af7bdee2eae1bc38e9b29 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 6fd003d12a1985c38fe910b9f7426b6bde36d94619cbb802dc3d48adc4ef5f2d all runs: crashed: WARNING in format_decode representative crash: WARNING in format_decode, types: [WARNING] # git bisect good d3436638738ace8f101af7bdee2eae1bc38e9b29 Bisecting: 1 revision left to test after this (roughly 1 step) [a735ae46a9b8b65e720cc6e79e24e087f751c3f6] cachefiles: Fix the incorrect return value in __cachefiles_write() determine whether the revision contains the guilty commit revision 38d767fb4a7766ec2058f97787e4c6e8d10343d6 crashed and is reachable testing commit a735ae46a9b8b65e720cc6e79e24e087f751c3f6 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: 6ea75452f99fbc118df185178fc1699b8675617280f42781771b5852dd9a7b9f all runs: OK false negative chance: 0.000 # git bisect bad a735ae46a9b8b65e720cc6e79e24e087f751c3f6 Bisecting: 0 revisions left to test after this (roughly 0 steps) [61d5fa45ed13e42af14c7e959baba9908b8ee6d4] bpf: Reject %p% format string in bprintf-like helpers determine whether the revision contains the guilty commit revision 91fa560c73a8126868848ed6cd70607cbf8d87e2 crashed and is reachable testing commit 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 gcc compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 kernel signature: bcdffe8881bacd3ef6437cd9bda5110a8c41e57a80139298b3ea7d476f58ed3f all runs: OK false negative chance: 0.000 # git bisect bad 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 is the first bad commit commit 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 Author: Paul Chaignon Date: Tue Jul 1 21:47:30 2025 +0200 bpf: Reject %p% format string in bprintf-like helpers [ Upstream commit f8242745871f81a3ac37f9f51853d12854fd0b58 ] static const char fmt[] = "%p%"; bpf_trace_printk(fmt, sizeof(fmt)); The above BPF program isn't rejected and causes a kernel warning at runtime: Please remove unsupported %\x00 in format string WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0 This happens because bpf_bprintf_prepare skips over the second %, detected as punctuation, while processing %p. This patch fixes it by not skipping over punctuation. %\x00 is then processed in the next iteration and rejected. Reported-by: syzbot+e2c932aec5c8a6e1d31c@syzkaller.appspotmail.com Fixes: 48cac3f4a96d ("bpf: Implement formatted output helpers with bstr_printf") Acked-by: Yonghong Song Signed-off-by: Paul Chaignon Link: https://lore.kernel.org/r/a0e06cc479faec9e802ae51ba5d66420523251ee.1751395489.git.paul.chaignon@gmail.com Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin kernel/bpf/helpers.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) accumulated error probability: 0.00 culprit signature: bcdffe8881bacd3ef6437cd9bda5110a8c41e57a80139298b3ea7d476f58ed3f parent signature: 6fd003d12a1985c38fe910b9f7426b6bde36d94619cbb802dc3d48adc4ef5f2d revisions tested: 18, total time: 4h20m15.436807223s (build: 1h40m55.35272039s, test: 2h32m20.641828696s) first good commit: 61d5fa45ed13e42af14c7e959baba9908b8ee6d4 bpf: Reject %p% format string in bprintf-like helpers recipients (to): ["ast@kernel.org" "paul.chaignon@gmail.com" "sashal@kernel.org" "yonghong.song@linux.dev"] recipients (cc): []