ci2 starts bisection 2024-04-09 05:19:20.28879189 +0000 UTC m=+12859.175769423 bisecting fixing commit since 61adba85cc40287232a539e607164f273260e0fe building syzkaller on 8e75c913b6f9b09cab2ad31fd7d66ea0d1703de8 ensuring issue is reproducible on original commit 61adba85cc40287232a539e607164f273260e0fe testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 921adfbcc452799075399ea89fab84fe4bb42249647475e00b9125d5db7b5a86 run #0: crashed: possible deadlock in __bpf_ringbuf_reserve run #1: crashed: possible deadlock in __bpf_ringbuf_reserve run #2: crashed: possible deadlock in __bpf_ringbuf_reserve run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: possible deadlock in __bpf_ringbuf_reserve run #6: crashed: possible deadlock in __bpf_ringbuf_reserve run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: possible deadlock in __bpf_ringbuf_reserve 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: possible deadlock in __bpf_ringbuf_reserve run #19: crashed: INFO: rcu detected stall in corrupted representative crash: INFO: rcu detected stall in corrupted, types: [HANG LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4a943127c34a2bca145f5f8216e23ad8ed9dba192a8d37aa1580b8dee24ccd10 run #0: crashed: possible deadlock in __bpf_ringbuf_reserve run #1: crashed: possible deadlock in __bpf_ringbuf_reserve run #2: crashed: possible deadlock in __bpf_ringbuf_reserve run #3: crashed: possible deadlock in __bpf_ringbuf_reserve run #4: crashed: possible deadlock in __bpf_ringbuf_reserve run #5: crashed: possible deadlock in __bpf_ringbuf_reserve run #6: crashed: possible deadlock in __bpf_ringbuf_reserve 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: possible deadlock in __bpf_ringbuf_reserve, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed kconfig minimization: base=3820 full=7452 leaves diff=1986 split chunks (needed=false): <1986> split chunk #0 of len 1986 into 5 parts testing without sub-chunk 1/5 disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 13b0efef01b72a2671d0a00f4bed4d49efb0eb4991d9a2cad89d2a6dd3a372a3 run #0: crashed: possible deadlock in __bpf_ringbuf_reserve run #1: crashed: possible deadlock in __bpf_ringbuf_reserve run #2: crashed: possible deadlock in __bpf_ringbuf_reserve run #3: crashed: possible deadlock in __bpf_ringbuf_reserve run #4: crashed: possible deadlock in __bpf_ringbuf_reserve 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: possible deadlock in __bpf_ringbuf_reserve, types: [LOCKDEP HANG] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 30c96220a40245a6cc683672848cc32a22097f754a1448c9b57382267de596ed run #0: crashed: possible deadlock in __bpf_ringbuf_reserve run #1: crashed: possible deadlock in __bpf_ringbuf_reserve run #2: crashed: possible deadlock in __bpf_ringbuf_reserve run #3: crashed: possible deadlock in __bpf_ringbuf_reserve run #4: crashed: possible deadlock in __bpf_ringbuf_reserve 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: possible deadlock in __bpf_ringbuf_reserve, types: [LOCKDEP HANG] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP LEAK], they are not needed testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 26d2d8b492d4569bfb0e9dee99658dc17b6f928a89c782edd1be2636a25950e7 all runs: crashed: possible deadlock in __bpf_ringbuf_reserve representative crash: possible deadlock in __bpf_ringbuf_reserve, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [BUG KASAN ATOMIC_SLEEP LEAK UBSAN], they are not needed testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f6b337833985407fcfeaf8f891b8d4342a31a6335b12e18f08bdc571c6e35e09 all runs: crashed: possible deadlock in __bpf_ringbuf_reserve representative crash: possible deadlock in __bpf_ringbuf_reserve, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP LEAK], they are not needed testing commit 61adba85cc40287232a539e607164f273260e0fe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f92e9050013040d44553a7afd2a9c86a348ff5f09fc620be37855fd172fa815c 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 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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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_PURELIFI WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_X2APIC X86_X32_ABI 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 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 [ATOMIC_SLEEP LEAK UBSAN BUG KASAN], they are not needed testing current HEAD 347385861c50adc8d4801d4b899eded38a2f04cd testing commit 347385861c50adc8d4801d4b899eded38a2f04cd gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4537dcaff73c19baa169e780ede8e8edabb0ec0b3c930daeea80c18ce00c1472 all runs: crashed: possible deadlock in __bpf_ringbuf_reserve representative crash: possible deadlock in __bpf_ringbuf_reserve, types: [LOCKDEP] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 1h54m6.240728737s (build: 53m56.907666842s, test: 56m27.548974682s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.84 crash: possible deadlock in __bpf_ringbuf_reserve ============================================ WARNING: possible recursive locking detected 6.1.84-syzkaller #0 Not tainted -------------------------------------------- syz-executor.3/1819 is trying to acquire lock: ffffc90005ba10d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x90/0x180 kernel/bpf/ringbuf.c:410 but task is already holding lock: ffffc90005eb90d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x90/0x180 kernel/bpf/ringbuf.c:410 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&rb->spinlock); lock(&rb->spinlock); *** DEADLOCK *** May be due to missing lock nesting notation 8 locks held by syz-executor.3/1819: #0: ffff888105e94438 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0xe/0x30 fs/namespace.c:393 #1: ffff888118b116f0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff888118b116f0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x138/0x2e0 fs/namei.c:4375 #2: ffff888118b016f0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #2: ffff888118b016f0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0x3e/0x1b0 fs/namei.c:4313 #3: ffff888105e92990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x867/0x900 fs/jbd2/transaction.c:463 #4: ffff888105e913f0 (&sbi->s_orphan_lock){+.+.}-{3:3}, at: ext4_orphan_add+0x326/0x520 fs/ext4/orphan.c:148 #5: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #5: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #5: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2272 [inline] #5: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x50/0x190 kernel/trace/bpf_trace.c:2312 #6: ffffc90005eb90d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x90/0x180 kernel/bpf/ringbuf.c:410 #7: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #7: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #7: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2272 [inline] #7: ffffffff83186e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x50/0x190 kernel/trace/bpf_trace.c:2312 stack backtrace: CPU: 0 PID: 1819 Comm: syz-executor.3 Not tainted 6.1.84-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x89/0xd7 lib/dump_stack.c:106 __lock_acquire+0x73d/0x2830 lock_acquire+0xe3/0x270 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5d/0x90 kernel/locking/spinlock.c:162 __bpf_ringbuf_reserve+0x90/0x180 kernel/bpf/ringbuf.c:410 ____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:445 [inline] bpf_ringbuf_reserve+0x11/0x20 kernel/bpf/ringbuf.c:437 ___bpf_prog_run+0x816/0x1b20 kernel/bpf/core.c:1842 __bpf_prog_run32+0xb7/0xe0 kernel/bpf/core.c:2066 bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2273 [inline] bpf_trace_run2+0xc3/0x190 kernel/trace/bpf_trace.c:2312 __traceiter_contention_end+0x26/0x40 include/trace/events/lock.h:122 trace_contention_end include/trace/events/lock.h:122 [inline] __pv_queued_spin_lock_slowpath+0x468/0x480 kernel/locking/qspinlock.c:560 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x95/0xa0 kernel/locking/spinlock_debug.c:115 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x69/0x90 kernel/locking/spinlock.c:162 __bpf_ringbuf_reserve+0x90/0x180 kernel/bpf/ringbuf.c:410 ____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:445 [inline] bpf_ringbuf_reserve+0x11/0x20 kernel/bpf/ringbuf.c:437 ___bpf_prog_run+0x816/0x1b20 kernel/bpf/core.c:1842 __bpf_prog_run32+0xb7/0xe0 kernel/bpf/core.c:2066 bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2273 [inline] bpf_trace_run2+0xc3/0x190 kernel/trace/bpf_trace.c:2312 __traceiter_contention_end+0x26/0x40 include/trace/events/lock.h:122 trace_contention_end include/trace/events/lock.h:122 [inline] __mutex_lock_common kernel/locking/mutex.c:612 [inline] __mutex_lock+0x808/0x970 kernel/locking/mutex.c:747 ext4_orphan_add+0x326/0x520 fs/ext4/orphan.c:148 __ext4_unlink+0x213/0x2e0 fs/ext4/namei.c:3293 ext4_unlink+0x6c/0x130 fs/ext4/namei.c:3324 vfs_unlink+0xf8/0x1b0 fs/namei.c:4324 do_unlinkat+0x1d9/0x2e0 fs/namei.c:4392 __do_sys_unlink fs/namei.c:4440 [inline] __se_sys_unlink fs/namei.c:4438 [inline] __x64_sys_unlink+0x1a/0x20 fs/namei.c:4438 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f3525d4c557 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee1dba0b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3525d4c557 RDX: 00007ffee1dba0e0 RSI: 00007ffee1dba170 RDI: 00007ffee1dba170 RBP: 00007ffee1dba170 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffee1dbb230 R13: 00007f3525d983b9 R14: 000000000000c163 R15: 0000000000000003