ci2 starts bisection 2024-09-16 20:16:21.99397541 +0000 UTC m=+20267.484402971 bisecting fixing commit since 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 building syzkaller on e4bacdaf3417006ad6aa0d911a44b49bb25a6e1a ensuring issue is reproducible on original commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ebd31d63b2be2823ba5b83e6ef2a69776edc3dceb1d4b12ca6a7711ea8c69431 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4eb8ce95cf5edd6f27b2da609691d0fbae635168424943db8f71d6090b578891 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed kconfig minimization: base=3706 full=7299 leaves diff=2036 split chunks (needed=false): <2036> split chunk #0 of len 2036 into 5 parts testing without sub-chunk 1/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1a69402355e4f41866d3b222b18e9d699b0757052d29b20be893203de483309d all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a46fe7305911231e693f4df8e97896404df330dff2771a9a230948728d70380b all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 06ea12939eff0b352566dc4a306ad1bfea5f6a9b33d22d66f43c1246108aede7 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 48182007e8a3243f09cfe30d5f7f68a13e0baba4d81bba43dc9cb9decca58c81 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6bc2500d134ffa3d7fbc94770c2eb23e1ad328a080419cae318071b73cb23b38 all runs: OK false negative chance: 0.000 minimized to 404 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB FRONTSWAP GPIOLIB HID_ZEROPLUS I2C_MUX IIO IRQ_REMAP 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_HOTPLUG_SPARSE MEMORY_HOTREMOVE MFD_VIPERBOARD PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RC_CORE RFKILL SND SOUND SPI SSB TAP TARGET_CORE TUN USB_AMD5536UDC USB_ATM USB_CONFIGFS USB_CONFIGFS_F_TCM USB_CONFIGFS_F_UAC1 USB_CONFIGFS_F_UAC1_LEGACY USB_CONFIGFS_F_UAC2 USB_CONFIGFS_F_UVC USB_CONFIGFS_MASS_STORAGE USB_CONFIGFS_NCM USB_CONFIGFS_OBEX USB_CONFIGFS_PHONET USB_CONFIGFS_RNDIS USB_CONFIGFS_SERIAL USB_CONN_GPIO USB_CXACRU 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USB_MAX3421_HCD USB_MDC800 USB_MICROTEK USB_MR800 USB_MSI2500 USB_MUSB_DUAL_ROLE USB_MUSB_HDRC USB_MV_U3D USB_MV_UDC USB_NET2272 USB_NET2272_DMA USB_NET2280 USB_NET_AQC111 USB_NET_AX88179_178A USB_NET_AX8817X USB_NET_CDCETHER USB_NET_CDC_EEM USB_NET_CDC_MBIM USB_NET_CDC_NCM USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_CH9200 USB_NET_CX82310_ETH USB_NET_DM9601 USB_NET_GL620A USB_NET_HUAWEI_CDC_NCM USB_NET_INT51X1 USB_NET_KALMIA USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_QMI_WWAN USB_NET_RNDIS_HOST USB_NET_RNDIS_WLAN USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_OXU210HP_HCD USB_PEGASUS USB_PULSE8_CEC USB_PWC USB_PWC_INPUT_EVDEV USB_PXA27X USB_R8A66597 USB_R8A66597_HCD USB_RAINSHADOW_CEC USB_RAREMONO USB_RAW_GADGET USB_RTL8150 USB_RTL8152 USB_RTL8153_ECM USB_S2255 USB_SERIAL USB_SERIAL_AIRCABLE USB_SERIAL_ARK3116 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_STKWEBCAM 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 USB_ZR364XX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA 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 VIDEOBUF_GEN VIDEOBUF_VMALLOC VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CPIA2 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_TM6000 VIDEO_TM6000_ALSA VIDEO_TM6000_DVB VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2 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 X86_SGX X86_X2APIC X86_X32 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 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 [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing current HEAD 3a5928702e7120f83f703fd566082bfb59f1a57e testing commit 3a5928702e7120f83f703fd566082bfb59f1a57e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: db6dbf31b94ca4660e210f68b28991060ec3d819e3ccbd9f1c0a445b71986423 all runs: OK false negative chance: 0.000 # git bisect start 3a5928702e7120f83f703fd566082bfb59f1a57e 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 Bisecting: 450 revisions left to test after this (roughly 9 steps) [f754591b17d0ee91c2b45fe9509d0cdc420527cb] xfs: fix log recovery buffer allocation for the legacy h_size fixup determine whether the revision contains the guilty commit revision 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 crashed and is reachable testing commit f754591b17d0ee91c2b45fe9509d0cdc420527cb gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ea2a5dc4b34ba2d9836a543656e784c4e6847f54cc91e09686adbe031c367619 all runs: OK false negative chance: 0.000 # git bisect bad f754591b17d0ee91c2b45fe9509d0cdc420527cb Bisecting: 225 revisions left to test after this (roughly 8 steps) [e4181a2c9b47fd06ee69b0f80c1a08fee3c1d2f1] perf/x86/intel/pt: Fix topa_entry base length determine whether the revision contains the guilty commit revision 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 crashed and is reachable testing commit e4181a2c9b47fd06ee69b0f80c1a08fee3c1d2f1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d5bb3219b81ed02f1f2ce97c6b317434ff559a04a1b0c1ee322ec4349ee4cdb0 all runs: OK false negative chance: 0.000 # git bisect bad e4181a2c9b47fd06ee69b0f80c1a08fee3c1d2f1 Bisecting: 112 revisions left to test after this (roughly 7 steps) [0d45e9942033d9a6645b36618ce2edf674358393] SUNRPC: Fixup gss_status tracepoint error output determine whether the revision contains the guilty commit revision 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 crashed and is reachable testing commit 0d45e9942033d9a6645b36618ce2edf674358393 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 86b4d779055c62b4a4e8ece0a3153f5675890540a0f16a3e9e9c56256e6d1ed5 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 0d45e9942033d9a6645b36618ce2edf674358393 Bisecting: 56 revisions left to test after this (roughly 6 steps) [215e9a695e4b86acbe71b441293f290dfdab0455] fuse: verify {g,u}id mount options correctly determine whether the revision contains the guilty commit revision 7e89efd3ae1cfa05fe918588a92628b9bbeda4b2 crashed and is reachable testing commit 215e9a695e4b86acbe71b441293f290dfdab0455 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5e61d3b99a5ab204c87125ff176b465c0913f1cfaf0dd95a428eb18cfd43cf85 all runs: OK false negative chance: 0.000 # git bisect bad 215e9a695e4b86acbe71b441293f290dfdab0455 Bisecting: 27 revisions left to test after this (roughly 5 steps) [6c57b171422735f231c35a863030e1dc359ada51] net: dsa: mv88e6xxx: Limit chip-wide frame size config to CPU ports determine whether the revision contains the guilty commit revision 0d45e9942033d9a6645b36618ce2edf674358393 crashed and is reachable testing commit 6c57b171422735f231c35a863030e1dc359ada51 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ce025e56a74650c54a5f763e0ac580ad44b2373dc4df88d2620647ddc58cb113 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 6c57b171422735f231c35a863030e1dc359ada51 Bisecting: 13 revisions left to test after this (roughly 4 steps) [ebefb924ceda81b89b3150d1e04b7a89666d9fef] fs/ntfs3: Fix field-spanning write in INDEX_HDR determine whether the revision contains the guilty commit revision 0d45e9942033d9a6645b36618ce2edf674358393 crashed and is reachable testing commit ebefb924ceda81b89b3150d1e04b7a89666d9fef gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ce025e56a74650c54a5f763e0ac580ad44b2373dc4df88d2620647ddc58cb113 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good ebefb924ceda81b89b3150d1e04b7a89666d9fef Bisecting: 6 revisions left to test after this (roughly 3 steps) [d240b789dded28e4fb9f28b4265dbaf67050d870] mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer determine whether the revision contains the guilty commit revision 0d45e9942033d9a6645b36618ce2edf674358393 crashed and is reachable testing commit d240b789dded28e4fb9f28b4265dbaf67050d870 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8ccd17669ac9844a264278aa82ef77e1f6223cfde6e1e5b98bfcf98f502f3d40 all runs: OK false negative chance: 0.000 # git bisect bad d240b789dded28e4fb9f28b4265dbaf67050d870 Bisecting: 3 revisions left to test after this (roughly 2 steps) [f99a44c33fa43adebefcd0e9d61e10ffbd8723cc] rtc: interface: Add RTC offset to alarm after fix-up determine whether the revision contains the guilty commit revision 6c57b171422735f231c35a863030e1dc359ada51 crashed and is reachable testing commit f99a44c33fa43adebefcd0e9d61e10ffbd8723cc gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1a756c24f26a75981c085117fbedbf5f33ec43a37def47db107bf8bac28a646a all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good f99a44c33fa43adebefcd0e9d61e10ffbd8723cc Bisecting: 1 revision left to test after this (roughly 1 step) [916c648323fa53b89eedb34a0988ddaf01406117] landlock: Don't lose track of restrictions on cred_transfer determine whether the revision contains the guilty commit revision 0d45e9942033d9a6645b36618ce2edf674358393 crashed and is reachable testing commit 916c648323fa53b89eedb34a0988ddaf01406117 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 59ac7fc95e265428052a4c484125351205b38feb539d85afda184e8529397147 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 916c648323fa53b89eedb34a0988ddaf01406117 Bisecting: 0 revisions left to test after this (roughly 0 steps) [fa774151f9b74a6b5a85cff1c9f876ad1f0db62a] mm/hugetlb: fix possible recursive locking detected warning determine whether the revision contains the guilty commit revision ebefb924ceda81b89b3150d1e04b7a89666d9fef crashed and is reachable testing commit fa774151f9b74a6b5a85cff1c9f876ad1f0db62a gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9afe3867026034e1a42eaf35d87431eaf03596371c286673daffd2bc643c7530 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good fa774151f9b74a6b5a85cff1c9f876ad1f0db62a d240b789dded28e4fb9f28b4265dbaf67050d870 is the first bad commit commit d240b789dded28e4fb9f28b4265dbaf67050d870 Author: Tetsuo Handa Date: Fri Jun 21 10:08:41 2024 +0900 mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer commit 7d6be67cfdd4a53cea7147313ca13c531e3a470f upstream. Commit 2b5067a8143e ("mm: mmap_lock: add tracepoints around lock acquisition") introduced TRACE_MMAP_LOCK_EVENT() macro using preempt_disable() in order to let get_mm_memcg_path() return a percpu buffer exclusively used by normal, softirq, irq and NMI contexts respectively. Commit 832b50725373 ("mm: mmap_lock: use local locks instead of disabling preemption") replaced preempt_disable() with local_lock(&memcg_paths.lock) based on an argument that preempt_disable() has to be avoided because get_mm_memcg_path() might sleep if PREEMPT_RT=y. But syzbot started reporting inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. and inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. messages, for local_lock() does not disable IRQ. We could replace local_lock() with local_lock_irqsave() in order to suppress these messages. But this patch instead replaces percpu buffers with on-stack buffer, for the size of each buffer returned by get_memcg_path_buf() is only 256 bytes which is tolerable for allocating from current thread's kernel stack memory. Link: https://lkml.kernel.org/r/ef22d289-eadb-4ed9-863b-fbc922b33d8d@I-love.SAKURA.ne.jp Reported-by: syzbot Closes: https://syzkaller.appspot.com/bug?extid=40905bca570ae6784745 Fixes: 832b50725373 ("mm: mmap_lock: use local locks instead of disabling preemption") Signed-off-by: Tetsuo Handa Reviewed-by: Axel Rasmussen Cc: Nicolas Saenz Julienne Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman mm/mmap_lock.c | 175 +++++++-------------------------------------------------- 1 file changed, 20 insertions(+), 155 deletions(-) accumulated error probability: 0.00 culprit signature: 8ccd17669ac9844a264278aa82ef77e1f6223cfde6e1e5b98bfcf98f502f3d40 parent signature: 9afe3867026034e1a42eaf35d87431eaf03596371c286673daffd2bc643c7530 revisions tested: 18, total time: 3h50m48.756066337s (build: 1h47m19.682666102s, test: 1h59m17.595660385s) first good commit: d240b789dded28e4fb9f28b4265dbaf67050d870 mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer recipients (to): ["akpm@linux-foundation.org" "axelrasmussen@google.com" "gregkh@linuxfoundation.org" "penguin-kernel@i-love.sakura.ne.jp"] recipients (cc): []