ci2 starts bisection 2026-06-27 15:57:52.505334228 +0000 UTC m=+88456.009882737 bisecting fixing commit since 9760bf04666dfe154161d49b6207c3486685bf29 building syzkaller on 303e2802d4760a2024848e19b613070c0df2a791 ensuring issue is reproducible on original commit 9760bf04666dfe154161d49b6207c3486685bf29 testing commit 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 19f0e569c392608342354aa95d65eab8fca41ea9eeea8be79234baf7d8f8315f all runs: crashed: inconsistent lock state in valid_state representative crash: inconsistent lock state in valid_state, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [bug_or_warning kasan atomic_sleep hang memleak ubsan], they are not needed testing commit 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 7909ac231a8b28121b385f66394e83ba6dc80e26c4a618810bdafee33bcd3a31 all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed kconfig minimization: base=3913 full=7800 leaves diff=2159 split chunks (needed=false): <2159> split chunk #0 of len 2159 into 5 parts testing without sub-chunk 1/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 8b0adba9d8c4b03c3f0880175ae1f240db6d8bf925d822a83fe5f507579ecc67 all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: fc27a81fc90fade2eab1e7da2d801ae8d1f32d7d1506316f55ee87a66620d18e all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [bug_or_warning kasan atomic_sleep hang memleak ubsan], they are not needed testing commit 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 1ad937d11d1522c2a3f994367d6a26c4b492e8f05c53f4ee4514afd86e2fb044 all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, 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 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: de2c0989133c447146ad0a4e4a3880d7f68b2da3b29259006c5d4be587ef8e8d all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 9760bf04666dfe154161d49b6207c3486685bf29 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: b75ee4c560cc60499de55d871defad14e6c699bb3aa466190573ccf0882cedbc all runs: OK false negative chance: 0.000 minimized to 431 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 IOMMUFD 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 MFD_VIPERBOARD NOP_USB_XCEIV 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 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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_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 UVC_COMMON 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_DEVICE_CDEV 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_TASK 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_CMDLINE 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_NOMODESET VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 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_USER_SHADOW_STACK 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 [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing current HEAD d1cfde2d5d15be14123bdd1689162bd27f995a90 testing commit d1cfde2d5d15be14123bdd1689162bd27f995a90 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: c79029f452f1ba010abc6202529c92a0f92580d4851309e7468cb2cfa21a9d3e run #0: OK run #1: OK run #2: OK run #3: OK run #4: OK run #5: ignore: lost connection to test machine run #6: OK run #7: OK run #8: OK run #9: OK false negative chance: 0.000 # git bisect start d1cfde2d5d15be14123bdd1689162bd27f995a90 9760bf04666dfe154161d49b6207c3486685bf29 Bisecting: 894 revisions left to test after this (roughly 10 steps) [a94d3dd78ee8b63e6b8ad629081c952c93ee5a10] bpf, sockmap: Fix af_unix null-ptr-deref in proto update determine whether the revision contains the guilty commit revision 9760bf04666dfe154161d49b6207c3486685bf29 crashed and is reachable testing commit a94d3dd78ee8b63e6b8ad629081c952c93ee5a10 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: c2aff5903cd7353ef85724e08dc75402575768f486c24e247370f782caef19c4 all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] # git bisect good a94d3dd78ee8b63e6b8ad629081c952c93ee5a10 Bisecting: 447 revisions left to test after this (roughly 9 steps) [d883312061ccde8c536595998aaf687ec070077c] Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size determine whether the revision contains the guilty commit revision a94d3dd78ee8b63e6b8ad629081c952c93ee5a10 crashed and is reachable testing commit d883312061ccde8c536595998aaf687ec070077c gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 661a6d7965d0c86cd854a27a0716e82ca501c5160572a4f756930b13ee8b01b3 all runs: OK false negative chance: 0.000 # git bisect bad d883312061ccde8c536595998aaf687ec070077c Bisecting: 223 revisions left to test after this (roughly 8 steps) [0f9ac21618c08ac73566e76712118f63992b32e2] ASoC: SOF: Intel: hda-dai: add support for dspless mode beyond HDAudio determine whether the revision contains the guilty commit revision 9760bf04666dfe154161d49b6207c3486685bf29 crashed and is reachable testing commit 0f9ac21618c08ac73566e76712118f63992b32e2 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: b4738a87aff61ae148351126e33ca16f8c004cf49d0ee2e292156513d58936e0 all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] # git bisect good 0f9ac21618c08ac73566e76712118f63992b32e2 Bisecting: 111 revisions left to test after this (roughly 7 steps) [309c6058622d080fe8c2fab87c30da82d834d989] scsi: isci: Fix use-after-free in device removal path determine whether the revision contains the guilty commit revision a94d3dd78ee8b63e6b8ad629081c952c93ee5a10 crashed and is reachable testing commit 309c6058622d080fe8c2fab87c30da82d834d989 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 40914c53c31e9eaf6d2515b680df72b2791816d27691ffaf50e45fb80b8c39f5 all runs: OK false negative chance: 0.000 # git bisect bad 309c6058622d080fe8c2fab87c30da82d834d989 Bisecting: 55 revisions left to test after this (roughly 6 steps) [492349e5e4a369a8b62781100a3ade470bf1ce6b] driver core: platform: use generic driver_override infrastructure determine whether the revision contains the guilty commit revision a94d3dd78ee8b63e6b8ad629081c952c93ee5a10 crashed and is reachable testing commit 492349e5e4a369a8b62781100a3ade470bf1ce6b gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 233d549a9d53c3210d004406e2412f4f5ba633408dbf6b91a4c43e5057dcf43a all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] # git bisect good 492349e5e4a369a8b62781100a3ade470bf1ce6b Bisecting: 27 revisions left to test after this (roughly 5 steps) [3af41ee7ebecb0d5c8a504861f6cfad31345310f] Bluetooth: ISO: drop ISO_END frames received without prior ISO_START determine whether the revision contains the guilty commit revision 0f9ac21618c08ac73566e76712118f63992b32e2 crashed and is reachable testing commit 3af41ee7ebecb0d5c8a504861f6cfad31345310f gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 3128b59b5dfa9a3019f03851aa1d018deef82c856439b9d3c1a5fde53a7dd50f all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] # git bisect good 3af41ee7ebecb0d5c8a504861f6cfad31345310f Bisecting: 13 revisions left to test after this (roughly 4 steps) [cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb] vsock/vmci: fix UAF when peer resets connection during handshake determine whether the revision contains the guilty commit revision 492349e5e4a369a8b62781100a3ade470bf1ce6b crashed and is reachable testing commit cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 20ab31e8efe25c20781404878a95215a7060697fe2dbc9fd2ccd0743cd852bf3 all runs: OK false negative chance: 0.000 # git bisect bad cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb Bisecting: 6 revisions left to test after this (roughly 3 steps) [16bd798cb6d8337d7c3eea1adc412f31b5181d5b] net: ifb: report ethtool stats over num_tx_queues determine whether the revision contains the guilty commit revision 9760bf04666dfe154161d49b6207c3486685bf29 crashed and is reachable testing commit 16bd798cb6d8337d7c3eea1adc412f31b5181d5b gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6cfc14c3680c57888122b2601647209a7dfbc9eb3973e99e976828c6693c54b3 all runs: OK false negative chance: 0.000 # git bisect bad 16bd798cb6d8337d7c3eea1adc412f31b5181d5b Bisecting: 3 revisions left to test after this (roughly 2 steps) [a143ce77a5292f2c9285137433d879ce71d190a7] Bluetooth: MGMT: validate Add Extended Advertising Data length determine whether the revision contains the guilty commit revision 9760bf04666dfe154161d49b6207c3486685bf29 crashed and is reachable testing commit a143ce77a5292f2c9285137433d879ce71d190a7 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: ea54682811f9b9b492bf6598acedbd88fcb8b8dcedd440c40d7abe0d4b844f2d all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] # git bisect good a143ce77a5292f2c9285137433d879ce71d190a7 Bisecting: 1 revision left to test after this (roughly 1 step) [8420aa4900417797323dd567ba9d1512280c2dc3] phonet/pep: disable BH around forwarded sk_receive_skb() determine whether the revision contains the guilty commit revision 0f9ac21618c08ac73566e76712118f63992b32e2 crashed and is reachable testing commit 8420aa4900417797323dd567ba9d1512280c2dc3 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 7b46175f71a32d74b1ce846edf3225988b9713b29717ab71636ce51d9d66b9cb all runs: OK false negative chance: 0.000 # git bisect bad 8420aa4900417797323dd567ba9d1512280c2dc3 Bisecting: 0 revisions left to test after this (roughly 0 steps) [be43e6b4043113c3b3cf887c3c8350f67140274c] Bluetooth: serialize accept_q access determine whether the revision contains the guilty commit revision 9760bf04666dfe154161d49b6207c3486685bf29 crashed and is reachable testing commit be43e6b4043113c3b3cf887c3c8350f67140274c gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6198311e7f9d5d8dacfd77e8837d30bd0fa928946209bc97571768f6ab19bb6c all runs: crashed: inconsistent lock state in __sk_receive_skb representative crash: inconsistent lock state in __sk_receive_skb, types: [LOCKDEP] # git bisect good be43e6b4043113c3b3cf887c3c8350f67140274c 8420aa4900417797323dd567ba9d1512280c2dc3 is the first bad commit commit 8420aa4900417797323dd567ba9d1512280c2dc3 Author: Zijing Yin Date: Tue May 19 10:26:33 2026 -0700 phonet/pep: disable BH around forwarded sk_receive_skb() commit dbc81608e3a653dea6cf403f20cae35468b8ab9c upstream. The networking receive path is usually run from softirq context, but protocols that take the socket lock may have packets stored in the backlog and processed later from process context. In that case release_sock() -> __release_sock() drops the slock with spin_unlock_bh() and then calls sk->sk_backlog_rcv() with bottom halves enabled. Typical sk_backlog_rcv handlers process the socket whose backlog is being drained, so the BH state at entry is irrelevant for the slocks they touch. pep_do_rcv() is different: when the inbound skb targets an existing PEP pipe, it forwards the skb to a different *child* socket via sk_receive_skb(). That helper takes the child slock with bh_lock_sock_nested(), which is just spin_lock_nested() and assumes BH is already off. The same child slock therefore ends up acquired with BH on (process path) and with BH off (softirq path): process context softirq context --------------- --------------- release_sock(listener) __netif_receive_skb() __release_sock() phonet_rcv() spin_unlock_bh() __sk_receive_skb(listener) [BH now ENABLED] [BH already disabled] sk_backlog_rcv: sk_backlog_rcv: pep_do_rcv() pep_do_rcv() sk_receive_skb(child) sk_receive_skb(child) bh_lock_sock_nested(child) bh_lock_sock_nested(child) => SOFTIRQ-ON-W => IN-SOFTIRQ-W Lockdep flags this as inconsistent lock state, and it can become a real self-deadlock if a softirq on the same CPU tries to receive to the same child socket while its slock is held in the BH-enabled path: WARNING: inconsistent lock state inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1cf/0x900 __sk_receive_skb net/core/sock.c:563 sk_receive_skb include/net/sock.h:2022 [inline] pep_do_rcv net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1190 __release_sock net/core/sock.c:3216 release_sock net/core/sock.c:3815 pep_sock_accept net/phonet/pep.c:879 Wrap the forwarded sk_receive_skb() in local_bh_disable() / local_bh_enable() so the child slock is always acquired with BH off. local_bh_disable() nests safely on the softirq path. Discovered via in-house syzkaller fuzzing; the same root cause also on the linux-6.1.y syzbot dashboard as extid 44f0626dd6284f02663c. Reproduced under KASAN + LOCKDEP + PROVE_LOCKING, reproducer: https://pastebin.com/A3t8xzCR Fixes: 9641458d3ec4 ("Phonet: Pipe End Point for Phonet Pipes protocol") Link: https://syzkaller.appspot.com/bug?extid=44f0626dd6284f02663c Cc: stable@vger.kernel.org Signed-off-by: Zijing Yin Acked-by: Rémi Denis-Courmont Reported-by: syzbot+9f4a135646b66c509935@syzkaller.appspotmail.com Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260519172635.86304-1-yzjaurora@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman net/phonet/pep.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) accumulated error probability: 0.00 culprit signature: 7b46175f71a32d74b1ce846edf3225988b9713b29717ab71636ce51d9d66b9cb parent signature: 6198311e7f9d5d8dacfd77e8837d30bd0fa928946209bc97571768f6ab19bb6c revisions tested: 19, total time: 4h34m53.992018648s (build: 1h34m47.946712773s, test: 2h16m1.070613719s) first good commit: 8420aa4900417797323dd567ba9d1512280c2dc3 phonet/pep: disable BH around forwarded sk_receive_skb() recipients (to): ["edumazet@google.com" "gregkh@linuxfoundation.org" "kuba@kernel.org" "remi@remlab.net" "yzjaurora@gmail.com"] recipients (cc): []