ci2 starts bisection 2025-05-28 05:23:57.272209983 +0000 UTC m=+138522.461671300 bisecting fixing commit since 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 building syzkaller on ef44b750e8fab8d6d5cb84920680581b13e0d470 ensuring issue is reproducible on original commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: c206d605706d4070ef2a3934a409f34d500ec7277cfd43fd57ffdc5dbd0d6787 all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] check whether we can drop unnecessary instrumentation disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 9ceafc574f9abcdd56430ce1e7b26386ec7561dc8d0fe09a49e8ed64d549eecd all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] the bug reproduces without the instrumentation disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed kconfig minimization: base=3829 full=7500 leaves diff=2071 split chunks (needed=false): <2071> split chunk #0 of len 2071 into 5 parts testing without sub-chunk 1/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: eacf3cc37f246f667c32d9c4a32299f0f04c64cb58584c8b584012e760dbc4ea all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 6af8c69fbdf6960f080c2b5cefb769aaf526b4034a73a04624ee9167fd9112fd all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG LOCKDEP], they are not needed testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 4ceefbcf2fa7600e0eed77c2e320cc68d1de1899f756d759039de24495f011d0 all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 3b91cfbe444269765355d8a17e4b075ed75c87637cf7e287692e49dec1303d3c all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 0cbb5f65e52f3e66410a7fe0edf75e1b2bf41e80 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: de6dff3f6ef73da235bacc4f58873a5da00c2e7899f59851cda74737c0def913 all runs: OK false negative chance: 0.000 minimized to 411 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 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_ECM_SUBSET USB_CONFIGFS_EEM USB_CONFIGFS_F_FS USB_CONFIGFS_F_HID USB_CONFIGFS_F_LB_SS USB_CONFIGFS_F_MIDI USB_CONFIGFS_F_PRINTER 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 USB_CYPRESS_CY7C63 USB_CYTHERM USB_DSBR USB_DUMMY_HCD USB_DWC2 USB_DWC2_HOST USB_DWC2_PCI USB_DWC3 USB_DWC3_GADGET USB_DWC3_HAPS USB_DWC3_OF_SIMPLE USB_DWC3_PCI USB_DWC3_ULPI USB_DYNAMIC_MINORS USB_EG20T USB_EHCI_FSL USB_EHCI_HCD_PLATFORM USB_EHCI_ROOT_HUB_TT USB_EHSET_TEST_FIXTURE USB_EMI26 USB_EMI62 USB_EPSON2888 USB_EZUSB_FX2 USB_FEW_INIT_RETRIES USB_FOTG210_HCD USB_FOTG210_UDC USB_FTDI_ELAN USB_F_ACM USB_F_ECM USB_F_EEM USB_F_FS USB_F_HID USB_F_MASS_STORAGE USB_F_MIDI USB_F_NCM USB_F_OBEX USB_F_PHONET USB_F_PRINTER USB_F_RNDIS USB_F_SERIAL USB_F_SS_LB USB_F_SUBSET USB_F_TCM USB_F_UAC1 USB_F_UAC1_LEGACY USB_F_UAC2 USB_F_UVC USB_GADGET USB_GADGETFS USB_GADGET_DEBUG_FILES 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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 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 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 [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing current HEAD da3c5173c55f7a0cf65c967d864386c79dcba3f7 testing commit da3c5173c55f7a0cf65c967d864386c79dcba3f7 gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 9a68a6ae7426f300cb58e11a225dbc6a72a2672a16f91b2660c57dafc07e019e all runs: crashed: KASAN: use-after-free Read in v4l2_fh_open representative crash: KASAN: use-after-free Read in v4l2_fh_open, types: [KASAN] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h9m2.664863116s (build: 1h3m17.94485945s, test: 54m48.642246706s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.140 crash: KASAN: use-after-free Read in v4l2_fh_open ================================================================== BUG: KASAN: use-after-free in v4l2_fh_init drivers/media/v4l2-core/v4l2-fh.c:25 [inline] BUG: KASAN: use-after-free in v4l2_fh_open+0xbe/0x420 drivers/media/v4l2-core/v4l2-fh.c:63 Read of size 8 at addr ffff8881052fc730 by task v4l_id/4163 CPU: 0 PID: 4163 Comm: v4l_id Not tainted 6.1.140-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0xdc/0x15b lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x220 mm/kasan/report.c:427 kasan_report+0x10b/0x140 mm/kasan/report.c:531 v4l2_fh_init drivers/media/v4l2-core/v4l2-fh.c:25 [inline] v4l2_fh_open+0xbe/0x420 drivers/media/v4l2-core/v4l2-fh.c:63 em28xx_v4l2_open+0x117/0x7d0 drivers/media/usb/em28xx/em28xx-video.c:2153 v4l2_open+0x1a7/0x2b0 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x247/0x5c0 fs/char_dev.c:414 do_dentry_open+0x604/0xd10 fs/open.c:882 do_open fs/namei.c:3626 [inline] path_openat+0x1eae/0x24e0 fs/namei.c:3783 do_filp_open+0x1b0/0x360 fs/namei.c:3810 do_sys_openat2+0x10a/0x430 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0xf0/0x120 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f61634b5407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffc830f5560 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f61633c7880 RCX: 00007f61634b5407 RDX: 0000000000000000 RSI: 00007ffc830f5f1d RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffc830f57b0 R14: 00007f6163c43000 R15: 00005629688b34d8 Allocated by task 4037: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] em28xx_v4l2_init+0xe0/0x28a0 drivers/media/usb/em28xx/em28xx-video.c:2532 em28xx_init_extension+0x115/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x769/0xee0 kernel/workqueue.c:2292 worker_thread+0x7f7/0xe10 kernel/workqueue.c:2439 kthread+0x205/0x250 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 4037: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3674 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2118 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x12dc/0x28a0 drivers/media/usb/em28xx/em28xx-video.c:2901 em28xx_init_extension+0x115/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x769/0xee0 kernel/workqueue.c:2292 worker_thread+0x7f7/0xe10 kernel/workqueue.c:2439 kthread+0x205/0x250 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8881052fc000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 1840 bytes inside of 8192-byte region [ffff8881052fc000, ffff8881052fe000) The buggy address belongs to the physical page: page:ffffea000414be00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1052f8 head:ffffea000414be00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 0000000000000000 dead000000000122 ffff888100042280 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4032, tgid 4032 (kworker/1:7), ts 102777301035, free_ts 102577936964 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x257/0x280 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x2ba4/0x2ce0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x420 mm/page_alloc.c:5606 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x70/0x250 mm/slub.c:1992 ___slab_alloc+0x9c1/0xe10 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19a/0x250 mm/slub.c:3437 kmalloc_trace+0x26/0xc0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] em28xx_v4l2_init+0xe0/0x28a0 drivers/media/usb/em28xx/em28xx-video.c:2532 em28xx_init_extension+0x115/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x769/0xee0 kernel/workqueue.c:2292 worker_thread+0x7f7/0xe10 kernel/workqueue.c:2439 kthread+0x205/0x250 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x786/0x7c0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3a0 mm/page_alloc.c:3479 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x19d/0x1f0 mm/slub.c:2586 put_cpu_partial+0x14c/0x1b0 mm/slub.c:2662 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4d/0x3f0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x11a/0x2a0 mm/slub.c:3429 __d_alloc+0x2c/0x900 fs/dcache.c:1774 d_alloc fs/dcache.c:1854 [inline] d_alloc_parallel+0xe0/0xfa0 fs/dcache.c:2645 __lookup_slow+0x104/0x2f0 fs/namei.c:1675 lookup_one_len+0x1d8/0x250 fs/namei.c:2740 start_creating+0x146/0x2a0 fs/debugfs/inode.c:377 debugfs_create_dir+0x16/0x450 fs/debugfs/inode.c:592 i2c_register_adapter+0x34b/0xd70 drivers/i2c/i2c-core-base.c:1562 Memory state around the buggy address: ffff8881052fc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881052fc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881052fc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881052fc780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881052fc800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================