ci2 starts bisection 2024-05-10 19:19:50.390719897 +0000 UTC m=+17345.476751994 bisecting fixing commit since 9465fef4ae351749f7068da8c78af4ca27e61928 building syzkaller on e91187ee96e4c5db9197c2617b6335413b1ee13b ensuring issue is reproducible on original commit 9465fef4ae351749f7068da8c78af4ca27e61928 testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7e324a7b5da1e5ab81cec31ab415f8576d8bc7dbc49d3370775c2c45164735d8 run #0: crashed: possible deadlock in tick_setup_sched_timer run #1: crashed: possible deadlock in tick_setup_sched_timer run #2: crashed: WARNING in sock_hash_delete_elem run #3: crashed: WARNING in sock_hash_delete_elem run #4: crashed: possible deadlock in tick_setup_sched_timer run #5: crashed: possible deadlock in tick_setup_sched_timer run #6: crashed: possible deadlock in tick_setup_sched_timer run #7: crashed: possible deadlock in tick_setup_sched_timer run #8: crashed: possible deadlock in tick_setup_sched_timer run #9: crashed: possible deadlock in tick_setup_sched_timer run #10: crashed: WARNING in sock_hash_delete_elem run #11: crashed: WARNING in sock_hash_delete_elem run #12: crashed: possible deadlock in tick_setup_sched_timer run #13: crashed: possible deadlock in tick_setup_sched_timer run #14: crashed: possible deadlock in tick_setup_sched_timer run #15: crashed: WARNING in sock_hash_delete_elem run #16: crashed: possible deadlock in tick_setup_sched_timer run #17: crashed: WARNING in sock_hash_delete_elem run #18: crashed: possible deadlock in tick_setup_sched_timer run #19: crashed: possible deadlock in tick_setup_sched_timer representative crash: possible deadlock in tick_setup_sched_timer, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: da03aa62f66718b0359a55c5f5050a8de72ba3ab0af184b61a66fa1625adbabb run #0: crashed: possible deadlock in tick_setup_sched_timer run #1: crashed: possible deadlock in tick_setup_sched_timer run #2: crashed: possible deadlock in tick_setup_sched_timer run #3: crashed: possible deadlock in tick_setup_sched_timer run #4: crashed: possible deadlock in tick_setup_sched_timer run #5: crashed: possible deadlock in tick_setup_sched_timer run #6: crashed: inconsistent lock state in sock_hash_delete_elem run #7: crashed: possible deadlock in tick_setup_sched_timer run #8: crashed: possible deadlock in tick_setup_sched_timer run #9: crashed: possible deadlock in tick_setup_sched_timer representative crash: possible deadlock in tick_setup_sched_timer, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed kconfig minimization: base=3703 full=7263 leaves diff=1978 split chunks (needed=false): <1978> split chunk #0 of len 1978 into 5 parts testing without sub-chunk 1/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 7ca7841dd3fe46589deb5f72432cdee2aa3bd8551d9e02971b3d342fc0d1e05b all runs: crashed: possible deadlock in tick_setup_sched_timer representative crash: possible deadlock in tick_setup_sched_timer, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4757661a8a3a67cefd925ec97e9ea5daf1f1a74bf41ed75dd766ce5dbdb06f9c all runs: crashed: possible deadlock in tick_setup_sched_timer representative crash: possible deadlock in tick_setup_sched_timer, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9c4278d6ab0b0b4be70c7166e664da8984b7126e03e2d6dd825e05559fbc52c1 run #0: crashed: possible deadlock in hrtimer_run_queues run #1: crashed: possible deadlock in hrtimer_run_queues run #2: crashed: possible deadlock in hrtimer_run_queues run #3: crashed: possible deadlock in hrtimer_run_queues run #4: crashed: possible deadlock in hrtimer_run_queues run #5: crashed: possible deadlock in hrtimer_run_queues run #6: crashed: inconsistent lock state in sock_hash_delete_elem run #7: crashed: possible deadlock in hrtimer_run_queues run #8: crashed: inconsistent lock state in sock_hash_delete_elem run #9: crashed: possible deadlock in hrtimer_run_queues representative crash: possible deadlock in hrtimer_run_queues, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a19175a8afd14b664e56b7f710a8d643d939945407c6a5fd14afbb4cf6232753 run #0: crashed: possible deadlock in hrtimer_run_queues run #1: crashed: possible deadlock in hrtimer_run_queues run #2: crashed: possible deadlock in hrtimer_run_queues run #3: crashed: possible deadlock in hrtimer_run_queues run #4: crashed: possible deadlock in hrtimer_run_queues run #5: crashed: possible deadlock in hrtimer_run_queues run #6: crashed: possible deadlock in hrtimer_run_queues run #7: crashed: possible deadlock in hrtimer_run_queues run #8: crashed: possible deadlock in hrtimer_run_queues run #9: crashed: inconsistent lock state in sock_hash_delete_elem representative crash: possible deadlock in hrtimer_run_queues, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 9465fef4ae351749f7068da8c78af4ca27e61928 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ec8b90f7aabb01fce5a163f984ed83b46895c5f461c9d61df99f052fb9cd1fe1 all runs: OK false negative chance: 0.000 minimized to 394 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 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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 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 [LEAK UBSAN BUG KASAN ATOMIC_SLEEP HANG], they are not needed testing current HEAD 284087d4f7d57502b5a41b423b771f16cc6d157a testing commit 284087d4f7d57502b5a41b423b771f16cc6d157a gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: ff91932401a6230a2c07f560f541ecb1cbfc568bf98d8459b6630b134295b026 all runs: OK false negative chance: 0.000 # git bisect start 284087d4f7d57502b5a41b423b771f16cc6d157a 9465fef4ae351749f7068da8c78af4ca27e61928 Bisecting: 477 revisions left to test after this (roughly 9 steps) [b34aa1a8c7a79e131185fee4c9ae949bcdce8868] NFSD: Pass the target nfsd_file to nfsd_commit() determine whether the revision contains the guilty commit revision 9465fef4ae351749f7068da8c78af4ca27e61928 crashed and is reachable testing commit b34aa1a8c7a79e131185fee4c9ae949bcdce8868 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building b34aa1a8c7a79e131185fee4c9ae949bcdce8868: fs/lockd/svcsubs.c:213:36: error: implicit declaration of function 'locks_inode_context'; did you mean 'sock_no_connect'? [-Werror=implicit-function-declaration] # git bisect skip b34aa1a8c7a79e131185fee4c9ae949bcdce8868 Bisecting: 476 revisions left to test after this (roughly 9 steps) [a08d9df51c527645168872fe7ab70a79575337d8] NFSD: Revert "NFSD: NFSv4 CLOSE should release an nfsd_file immediately" determine whether the revision contains the guilty commit revision b34aa1a8c7a79e131185fee4c9ae949bcdce8868 crashed and is reachable testing commit a08d9df51c527645168872fe7ab70a79575337d8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building a08d9df51c527645168872fe7ab70a79575337d8: fs/lockd/svcsubs.c:213:36: error: implicit declaration of function 'locks_inode_context'; did you mean 'sock_no_connect'? [-Werror=implicit-function-declaration] # git bisect skip a08d9df51c527645168872fe7ab70a79575337d8 Bisecting: 476 revisions left to test after this (roughly 9 steps) [8c820f7c8e9b46238d277c575392fe9930207aab] scsi: qla2xxx: Fix off by one in qla_edif_app_getstats() determine whether the revision contains the guilty commit revision 9465fef4ae351749f7068da8c78af4ca27e61928 crashed and is reachable testing commit 8c820f7c8e9b46238d277c575392fe9930207aab gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 139d7ccfe460906aff8fb41227939201dd6df5c52335120f6a859baa376f2f2f all runs: OK false negative chance: 0.000 # git bisect bad 8c820f7c8e9b46238d277c575392fe9930207aab Bisecting: 381 revisions left to test after this (roughly 9 steps) [2540b70429984a5877f7a188edbf259de6b56ff6] NFSD: Clean up SPLICE_OK in nfsd4_encode_read() determine whether the revision contains the guilty commit revision 9465fef4ae351749f7068da8c78af4ca27e61928 crashed and is reachable testing commit 2540b70429984a5877f7a188edbf259de6b56ff6 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f734f1ca0a2404e1876e7b45a788d073fcd29313a7a7104e2895cb6cc7dcbfa9 run #0: crashed: possible deadlock in hrtimer_run_queues run #1: crashed: possible deadlock in hrtimer_run_queues run #2: crashed: inconsistent lock state in sock_hash_delete_elem run #3: crashed: inconsistent lock state in sock_hash_delete_elem run #4: crashed: inconsistent lock state in sock_hash_delete_elem run #5: crashed: possible deadlock in hrtimer_run_queues run #6: crashed: possible deadlock in hrtimer_run_queues run #7: crashed: possible deadlock in hrtimer_run_queues run #8: crashed: possible deadlock in hrtimer_run_queues run #9: crashed: possible deadlock in hrtimer_run_queues representative crash: possible deadlock in hrtimer_run_queues, types: [LOCKDEP] # git bisect good 2540b70429984a5877f7a188edbf259de6b56ff6 Bisecting: 190 revisions left to test after this (roughly 8 steps) [0ecd5689767b9bc85f1423b62481ba8c4a3f440d] mmc: core: Initialize mmc_blk_ioc_data determine whether the revision contains the guilty commit revision b34aa1a8c7a79e131185fee4c9ae949bcdce8868 crashed and is reachable testing commit 0ecd5689767b9bc85f1423b62481ba8c4a3f440d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: af1130dc9558dff3494c3271dfc515a58c649c0294cdde932fa5a762c226e856 all runs: crashed: possible deadlock in hrtimer_run_queues representative crash: possible deadlock in hrtimer_run_queues, types: [LOCKDEP] # git bisect good 0ecd5689767b9bc85f1423b62481ba8c4a3f440d Bisecting: 94 revisions left to test after this (roughly 7 steps) [117d7ef3190cce186c48c70000abe80f3a560b90] ata: sata_sx4: fix pdc20621_get_from_dimm() on 64-bit determine whether the revision contains the guilty commit revision 9465fef4ae351749f7068da8c78af4ca27e61928 crashed and is reachable testing commit 117d7ef3190cce186c48c70000abe80f3a560b90 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b0b3600318f521f0e09d93641d741bb0ab8426513e1d7d870ec13f69c09546d8 all runs: OK false negative chance: 0.000 # git bisect bad 117d7ef3190cce186c48c70000abe80f3a560b90 Bisecting: 47 revisions left to test after this (roughly 6 steps) [571d80f8a4581ba48fd3dc834e91139ec95abe52] x86/cpufeatures: Add new word for scattered features determine whether the revision contains the guilty commit revision 2540b70429984a5877f7a188edbf259de6b56ff6 crashed and is reachable testing commit 571d80f8a4581ba48fd3dc834e91139ec95abe52 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 0fa411056bde620764b53d94180875bf9a96bebce6a153f0b7f98cc9aa4b374d run #0: crashed: possible deadlock in hrtimer_run_queues run #1: crashed: possible deadlock in hrtimer_run_queues run #2: crashed: possible deadlock in hrtimer_run_queues run #3: crashed: inconsistent lock state in sock_hash_delete_elem run #4: crashed: possible deadlock in hrtimer_run_queues run #5: crashed: possible deadlock in hrtimer_run_queues run #6: crashed: inconsistent lock state in sock_hash_delete_elem run #7: crashed: possible deadlock in hrtimer_run_queues run #8: crashed: possible deadlock in hrtimer_run_queues run #9: crashed: possible deadlock in hrtimer_run_queues representative crash: possible deadlock in hrtimer_run_queues, types: [LOCKDEP] # git bisect good 571d80f8a4581ba48fd3dc834e91139ec95abe52 Bisecting: 23 revisions left to test after this (roughly 5 steps) [61f5b43bc04eb213c0b5bf594b2a949be86684e3] selftests: reuseaddr_conflict: add missing new line at the end of the output determine whether the revision contains the guilty commit revision 9465fef4ae351749f7068da8c78af4ca27e61928 crashed and is reachable testing commit 61f5b43bc04eb213c0b5bf594b2a949be86684e3 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4c4643fe65bca376220af798d7a9eacc15e7c752018a556ea7a2eed73ff5f284 all runs: OK false negative chance: 0.000 # git bisect bad 61f5b43bc04eb213c0b5bf594b2a949be86684e3 Bisecting: 11 revisions left to test after this (roughly 4 steps) [bd9a25a0228e557209f6e9bec4eae4c6d801e3ea] KVM: x86: Bail to userspace if emulation of atomic user access faults determine whether the revision contains the guilty commit revision 0ecd5689767b9bc85f1423b62481ba8c4a3f440d crashed and is reachable testing commit bd9a25a0228e557209f6e9bec4eae4c6d801e3ea gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 448b304dc573cad618c593c2f02392abdfbeefa7ca01ad725bb09a3f471099c9 all runs: crashed: possible deadlock in hrtimer_run_queues representative crash: possible deadlock in hrtimer_run_queues, types: [LOCKDEP] # git bisect good bd9a25a0228e557209f6e9bec4eae4c6d801e3ea Bisecting: 5 revisions left to test after this (roughly 3 steps) [465abe8a7af489fd6c762257cdc0f07fa01124a3] vboxsf: Avoid an spurious warning if load_nls_xxx() fails determine whether the revision contains the guilty commit revision 2540b70429984a5877f7a188edbf259de6b56ff6 crashed and is reachable testing commit 465abe8a7af489fd6c762257cdc0f07fa01124a3 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 240582025e630cdd7e3046825be8b42600d6ec04f7c70b1a5f4acae61fda9000 run #0: crashed: inconsistent lock state in sock_hash_delete_elem run #1: crashed: possible deadlock in hrtimer_run_queues run #2: crashed: inconsistent lock state in sock_hash_delete_elem run #3: crashed: possible deadlock in hrtimer_run_queues run #4: crashed: possible deadlock in hrtimer_run_queues run #5: crashed: possible deadlock in hrtimer_run_queues run #6: crashed: possible deadlock in hrtimer_run_queues run #7: crashed: possible deadlock in hrtimer_run_queues run #8: crashed: possible deadlock in hrtimer_run_queues run #9: crashed: inconsistent lock state in sock_hash_delete_elem representative crash: inconsistent lock state in sock_hash_delete_elem, types: [LOCKDEP] # git bisect good 465abe8a7af489fd6c762257cdc0f07fa01124a3 Bisecting: 2 revisions left to test after this (roughly 2 steps) [457c832a0c5db78339146734041faa61a2546737] net: stmmac: fix rx queue priority assignment determine whether the revision contains the guilty commit revision 2540b70429984a5877f7a188edbf259de6b56ff6 crashed and is reachable testing commit 457c832a0c5db78339146734041faa61a2546737 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4c4643fe65bca376220af798d7a9eacc15e7c752018a556ea7a2eed73ff5f284 all runs: OK false negative chance: 0.000 # git bisect bad 457c832a0c5db78339146734041faa61a2546737 Bisecting: 0 revisions left to test after this (roughly 1 step) [a097fc199ab5f4b5392c5144034c0d2148b55a14] net/sched: act_skbmod: prevent kernel-infoleak determine whether the revision contains the guilty commit revision 571d80f8a4581ba48fd3dc834e91139ec95abe52 crashed and is reachable testing commit a097fc199ab5f4b5392c5144034c0d2148b55a14 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4c4643fe65bca376220af798d7a9eacc15e7c752018a556ea7a2eed73ff5f284 all runs: OK false negative chance: 0.000 # git bisect bad a097fc199ab5f4b5392c5144034c0d2148b55a14 Bisecting: 0 revisions left to test after this (roughly 0 steps) [d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec] bpf, sockmap: Prevent lock inversion deadlock in map delete elem determine whether the revision contains the guilty commit revision b34aa1a8c7a79e131185fee4c9ae949bcdce8868 crashed and is reachable testing commit d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4c4643fe65bca376220af798d7a9eacc15e7c752018a556ea7a2eed73ff5f284 all runs: OK false negative chance: 0.000 # git bisect bad d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec is the first bad commit commit d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec Author: Jakub Sitnicki Date: Tue Apr 2 12:46:21 2024 +0200 bpf, sockmap: Prevent lock inversion deadlock in map delete elem commit ff91059932401894e6c86341915615c5eb0eca48 upstream. syzkaller started using corpuses where a BPF tracing program deletes elements from a sockmap/sockhash map. Because BPF tracing programs can be invoked from any interrupt context, locks taken during a map_delete_elem operation must be hardirq-safe. Otherwise a deadlock due to lock inversion is possible, as reported by lockdep: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&host->lock); lock(&htab->buckets[i].lock); lock(&host->lock); Locks in sockmap are hardirq-unsafe by design. We expects elements to be deleted from sockmap/sockhash only in task (normal) context with interrupts enabled, or in softirq context. Detect when map_delete_elem operation is invoked from a context which is _not_ hardirq-unsafe, that is interrupts are disabled, and bail out with an error. Note that map updates are not affected by this issue. BPF verifier does not allow updating sockmap/sockhash from a BPF tracing program today. Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface") Reported-by: xingwei lee Reported-by: yue sun Reported-by: syzbot+bc922f476bd65abbd466@syzkaller.appspotmail.com Reported-by: syzbot+d4066896495db380182e@syzkaller.appspotmail.com Signed-off-by: Jakub Sitnicki Signed-off-by: Daniel Borkmann Tested-by: syzbot+d4066896495db380182e@syzkaller.appspotmail.com Acked-by: John Fastabend Closes: https://syzkaller.appspot.com/bug?extid=d4066896495db380182e Closes: https://syzkaller.appspot.com/bug?extid=bc922f476bd65abbd466 Link: https://lore.kernel.org/bpf/20240402104621.1050319-1-jakub@cloudflare.com Signed-off-by: Greg Kroah-Hartman net/core/sock_map.c | 6 ++++++ 1 file changed, 6 insertions(+) accumulated error probability: 0.00 culprit signature: 4c4643fe65bca376220af798d7a9eacc15e7c752018a556ea7a2eed73ff5f284 parent signature: 240582025e630cdd7e3046825be8b42600d6ec04f7c70b1a5f4acae61fda9000 revisions tested: 19, total time: 3h3m42.211257763s (build: 1h0m18.063152334s, test: 1h59m31.733064407s) first good commit: d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec bpf, sockmap: Prevent lock inversion deadlock in map delete elem recipients (to): ["daniel@iogearbox.net" "gregkh@linuxfoundation.org" "jakub@cloudflare.com" "john.fastabend@gmail.com" "syzbot+d4066896495db380182e@syzkaller.appspotmail.com"] recipients (cc): []