ci2 starts bisection 2026-01-05 22:28:53.945085902 +0000 UTC m=+3488346.122208959 bisecting fixing commit since f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe building syzkaller on 2c50b6a91afe391fad4d14f7b7d7167d570089dd ensuring issue is reproducible on original commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 267c7cf73de70564555c32d14e61744064df2993958b9ce05b315b10968ad793 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in sys_recvmsg run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in nf_setsockopt run #9: crashed: INFO: rcu detected stall in corrupted run #10: crashed: INFO: rcu detected stall in corrupted run #11: crashed: INFO: rcu detected stall in corrupted run #12: crashed: INFO: rcu detected stall in corrupted run #13: crashed: INFO: rcu detected stall in corrupted run #14: crashed: INFO: rcu detected stall in corrupted run #15: crashed: INFO: rcu detected stall in corrupted run #16: crashed: INFO: rcu detected stall in corrupted run #17: crashed: INFO: rcu detected stall in corrupted run #18: crashed: INFO: rcu detected stall in corrupted run #19: crashed: no output from test machine representative crash: INFO: rcu detected stall in corrupted, types: [HANG] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep memleak ubsan bug_or_warning kasan locking], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 3cd2a2a6247ae6e446d508b1621a8035d64e34cacddc0bbe65c5d5d419651e15 all runs: OK false negative chance: 0.000 kconfig minimization: base=3829 full=7619 leaves diff=2131 split chunks (needed=false): <2131> split chunk #0 of len 2131 into 5 parts testing without sub-chunk 1/5 testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 5b864ac2c8616e6d2637ec21128b6437b5765ef693b28ea5afaae4f54488abe9 run #0: crashed: INFO: rcu detected stall in sys_openat run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in sys_clone run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in security_file_open run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in sys_openat, types: [HANG] the chunk can be dropped testing without sub-chunk 2/5 testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: e84bc7d15b5281869ad55143dfed6b9458646058787419eca48306f3a06ab8a4 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in mas_store_prealloc run #6: crashed: INFO: rcu detected stall in sys_exit_group run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: no output from test machine representative crash: INFO: rcu detected stall in corrupted, types: [HANG] the chunk can be dropped testing without sub-chunk 3/5 testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 41d4d62b63e48a0f31ad8b9ce0e924b3af795c2f477bfbedfa60b7ae934decd9 run #0: crashed: INFO: rcu detected stall in do_idle run #1: crashed: INFO: rcu detected stall in syscall_enter_from_user_mode run #2: crashed: INFO: rcu detected stall in sys_rename run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in do_idle run #6: crashed: INFO: rcu detected stall in sys_openat run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in do_idle, types: [HANG] the chunk can be dropped testing without sub-chunk 4/5 testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: fec9fcbd25a13e78abb49db1ec1ea5f033977ad8a9bd7fdf220739176aa35268 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in do_idle run #3: crashed: INFO: rcu detected stall in sys_newfstatat run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in do_idle run #6: crashed: INFO: rcu detected stall in vm_area_alloc run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in sys_newfstat representative crash: INFO: rcu detected stall in corrupted, types: [HANG] the chunk can be dropped testing without sub-chunk 5/5 testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: e6b3e5e679a4e1dec483058255c5e92fc3b2dd2d446b533e8ff8e9ca67566d9a all runs: OK false negative chance: 0.000 minimized to 423 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA COMMON_CLK CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB GPIOLIB HID_ZEROPLUS I2C_MUX IIO IRQ_REMAP KVM KVM_INTEL LIBNVDIMM MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE 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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 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] testing current HEAD 50cbba13faa294918f0e1a9cb2b0aba19f4e6fba testing commit 50cbba13faa294918f0e1a9cb2b0aba19f4e6fba gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 39c6c0ff6b3f621e3a5f3d7ac6b55ec86fd6df2721b98c43bb5e76ea00cd71ad all runs: OK false negative chance: 0.000 # git bisect start 50cbba13faa294918f0e1a9cb2b0aba19f4e6fba f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe Bisecting: 283 revisions left to test after this (roughly 8 steps) [94a649487ee7249cdbf153b933285da2ca537377] clk: at91: clk-master: Add check for divide by 3 determine whether the revision contains the guilty commit revision f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe crashed and is reachable testing commit 94a649487ee7249cdbf153b933285da2ca537377 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2c45b534b6341e8bb6c3d3e3d950a07611ca4b631892d73bd862c4dd1d6285a0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in do_idle run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in sys_openat run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in syscall_enter_from_user_mode run #8: crashed: INFO: rcu detected stall in sys_openat run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect good 94a649487ee7249cdbf153b933285da2ca537377 Bisecting: 141 revisions left to test after this (roughly 7 steps) [44a4833917370f110ece142642ae0f27a7ba1250] net/mlx5e: Preserve shared buffer capacity during headroom updates determine whether the revision contains the guilty commit revision f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe crashed and is reachable testing commit 44a4833917370f110ece142642ae0f27a7ba1250 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: ef2113b3b91f447d75378dd86083cc6686af5d1803a88564840035e8a48f113f all runs: OK false negative chance: 0.000 # git bisect bad 44a4833917370f110ece142642ae0f27a7ba1250 Bisecting: 70 revisions left to test after this (roughly 6 steps) [d0d858652834dcf531342c82a0428170aa7c2675] sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto determine whether the revision contains the guilty commit revision 94a649487ee7249cdbf153b933285da2ca537377 crashed and is reachable testing commit d0d858652834dcf531342c82a0428170aa7c2675 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: d4427fa25e3f23aa6168c76114c86903cf3aed86afbf92551ebd16d829ade37b run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in do_idle run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in kernfs_fop_release run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in sys_newfstatat run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect good d0d858652834dcf531342c82a0428170aa7c2675 Bisecting: 35 revisions left to test after this (roughly 5 steps) [c3ee48468bb4b0dac913047a2263e920713105cf] lib/crypto: arm/curve25519: Disable on CPU_BIG_ENDIAN determine whether the revision contains the guilty commit revision d0d858652834dcf531342c82a0428170aa7c2675 crashed and is reachable testing commit c3ee48468bb4b0dac913047a2263e920713105cf gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: c2e89887bd4654ace311b3c11d36d3b4fe79201bb929c53fec57054d0233e9d2 all runs: OK false negative chance: 0.000 # git bisect bad c3ee48468bb4b0dac913047a2263e920713105cf Bisecting: 17 revisions left to test after this (roughly 4 steps) [c022018353a16b4d492b989ba124e87493c6b8f0] net/mlx5e: Fix potentially misleading debug message determine whether the revision contains the guilty commit revision 94a649487ee7249cdbf153b933285da2ca537377 crashed and is reachable testing commit c022018353a16b4d492b989ba124e87493c6b8f0 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 49ceb32943e5e2c11858cee574f6a4408d218d330eaa7ac06fa9d29a4ec2c7b2 run #0: crashed: INFO: rcu detected stall in do_idle run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in sys_newfstatat run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in sys_newfstat run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in do_idle, types: [HANG] # git bisect good c022018353a16b4d492b989ba124e87493c6b8f0 Bisecting: 8 revisions left to test after this (roughly 3 steps) [6df6ead6382d07dec752a91a30d953b7efa4e50b] ASoC: cs4271: Fix regulator leak on probe failure determine whether the revision contains the guilty commit revision d0d858652834dcf531342c82a0428170aa7c2675 crashed and is reachable testing commit 6df6ead6382d07dec752a91a30d953b7efa4e50b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6c4822527411d9b4dc1452520009b03145b530ac68c49b299c30e9ba5f0e73be run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in do_idle run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in sys_newfstatat run #4: crashed: INFO: rcu detected stall in sys_openat run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect good 6df6ead6382d07dec752a91a30d953b7efa4e50b Bisecting: 4 revisions left to test after this (roughly 2 steps) [2762d3ea9c929ca4094541ca517c317ffa94625b] ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd determine whether the revision contains the guilty commit revision f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe crashed and is reachable testing commit 2762d3ea9c929ca4094541ca517c317ffa94625b gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 2a3edeced92036c55c7405e68dc30813aa52c7a096d821f78257318c08d1d2f0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in sys_openat run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG] # git bisect good 2762d3ea9c929ca4094541ca517c317ffa94625b Bisecting: 2 revisions left to test after this (roughly 1 step) [4443fc58fcc283a9a7aa73f2f30e427296612ec7] softirq: Add trace points for tasklet entry/exit determine whether the revision contains the guilty commit revision 2762d3ea9c929ca4094541ca517c317ffa94625b crashed and is reachable testing commit 4443fc58fcc283a9a7aa73f2f30e427296612ec7 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 4393d5025e8263e454f9a32c2f9a4c7ba335024438af28cf5cb67afbce8348e1 all runs: OK false negative chance: 0.000 # git bisect bad 4443fc58fcc283a9a7aa73f2f30e427296612ec7 Bisecting: 0 revisions left to test after this (roughly 0 steps) [5e149d8a8e732126fb6014efd60075cf63a73f91] bpf: Add bpf_prog_run_data_pointers() determine whether the revision contains the guilty commit revision 2762d3ea9c929ca4094541ca517c317ffa94625b crashed and is reachable testing commit 5e149d8a8e732126fb6014efd60075cf63a73f91 gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 0b8eb6943b741b86d68277339893220d5711d0fb3899c05cfbdacdbb07ff71bc run #0: crashed: INFO: rcu detected stall in do_idle run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in sys_unlink run #4: crashed: INFO: rcu detected stall in sys_bpf run #5: crashed: INFO: rcu detected stall in sys_unlink run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in clone3 representative crash: INFO: rcu detected stall in do_idle, types: [HANG] # git bisect good 5e149d8a8e732126fb6014efd60075cf63a73f91 4443fc58fcc283a9a7aa73f2f30e427296612ec7 is the first bad commit commit 4443fc58fcc283a9a7aa73f2f30e427296612ec7 Author: Sumanth Gavini Date: Tue Nov 11 21:16:20 2025 -0600 softirq: Add trace points for tasklet entry/exit commit f4bf3ca2e5cba655824b6e0893a98dfb33ed24e5 upstream. Tasklets are supposed to finish their work quickly and should not block the current running process, but it is not guaranteed that they do so. Currently softirq_entry/exit can be used to analyse the total tasklets execution time, but that's not helpful to track individual tasklets execution time. That makes it hard to identify tasklet functions, which take more time than expected. Add tasklet_entry/exit trace point support to track individual tasklet execution. Trivial usage example: # echo 1 > /sys/kernel/debug/tracing/events/irq/tasklet_entry/enable # echo 1 > /sys/kernel/debug/tracing/events/irq/tasklet_exit/enable # cat /sys/kernel/debug/tracing/trace # tracer: nop # # entries-in-buffer/entries-written: 4/4 #P:4 # # _-----=> irqs-off/BH-disabled # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / _-=> migrate-disable # |||| / delay # TASK-PID CPU# ||||| TIMESTAMP FUNCTION # | | | ||||| | | -0 [003] ..s1. 314.011428: tasklet_entry: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func -0 [003] ..s1. 314.011432: tasklet_exit: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func -0 [003] ..s1. 314.017369: tasklet_entry: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func -0 [003] ..s1. 314.017371: tasklet_exit: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func Signed-off-by: Lingutla Chandrasekhar Signed-off-by: J. Avila Signed-off-by: John Stultz Signed-off-by: Thomas Gleixner Reviewed-by: Steven Rostedt (Google) Link: https://lore.kernel.org/r/20230407230526.1685443-1-jstultz@google.com [elavila: Port to android-mainline] [jstultz: Rebased to upstream, cut unused trace points, added comments for the tracepoints, reworded commit] The intention is to keep the stable branch in sync with upstream fixes and improve observability without introducing new functionality. Signed-off-by: Sumanth Gavini Changes in V2: - No code changes - Link to V1: https://lore.kernel.org/all/20250812161755.609600-1-sumanth.gavini@yahoo.com/ - Updated the comment msg before the signed-off-by Signed-off-by: Sasha Levin include/trace/events/irq.h | 47 ++++++++++++++++++++++++++++++++++++++++++++++ kernel/softirq.c | 9 +++++++-- 2 files changed, 54 insertions(+), 2 deletions(-) accumulated error probability: 0.00 culprit signature: 4393d5025e8263e454f9a32c2f9a4c7ba335024438af28cf5cb67afbce8348e1 parent signature: 0b8eb6943b741b86d68277339893220d5711d0fb3899c05cfbdacdbb07ff71bc revisions tested: 17, total time: 5h48m48.882493688s (build: 3h10m20.160996246s, test: 2h30m3.815439542s) first good commit: 4443fc58fcc283a9a7aa73f2f30e427296612ec7 softirq: Add trace points for tasklet entry/exit recipients (to): ["clingutla@codeaurora.org" "elavila@google.com" "jstultz@google.com" "rostedt@goodmis.org" "sashal@kernel.org" "sumanth.gavini@yahoo.com" "tglx@linutronix.de"] recipients (cc): []