ci2 starts bisection 2026-08-01 07:01:26.943208519 +0000 UTC m=+16680.914221679 bisecting fixing commit since 7c87defbd336df289c8c0280f019647864ff70c6 building syzkaller on 303e2802d4760a2024848e19b613070c0df2a791 ensuring issue is reproducible on original commit 7c87defbd336df289c8c0280f019647864ff70c6 testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: f15f123b0ba61cc5cc4d37205c02de3bf8832d026d85586ff1457bcd3483a708 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-USE-AFTER-FREE-READ] check whether we can drop unnecessary instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 9d095c756e788ce6a332ae8229bb00662f59c6cf61d044732d8fc94331338e01 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-USE-AFTER-FREE-READ] the bug reproduces without the instrumentation disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed kconfig minimization: base=3829 full=7620 leaves diff=2128 split chunks (needed=false): <2128> split chunk #0 of len 2128 into 5 parts testing without sub-chunk 1/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 6d5611f753e4a71b589504600cfc5e0165a87ae2ab050adc555a6ab519475ed4 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-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 8704360f0231b2be78f34028dab83481180e670f6f8307204829990a03af4960 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-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: d03a5d5550709069060e31cc66b6f555261cffdd002f5861c18613cb63c5937a 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-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [memleak ubsan bug_or_warning locking atomic_sleep hang], they are not needed testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: e8e59cd18874474decc24b9415986cf6404e3fb557a69314d217d6aef4304683 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-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 7c87defbd336df289c8c0280f019647864ff70c6 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 96d2b3967e86a85be1654a8959bdffff43f540067cdbe44b06570ed13890e207 all runs: OK false negative chance: 0.000 minimized to 424 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 NOP_USB_XCEIV PARPORT PCCARD PCMCIA PHONET RADIO_ADAPTERS RADIO_SI470X RADIO_SI4713 RC_CORE RFKILL SND 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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 USERFAULTFD USERIO USER_RETURN_NOTIFIER 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_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 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 locking atomic_sleep], they are not needed testing current HEAD fb28aa725e05025101446230b14b1defe4c66666 testing commit fb28aa725e05025101446230b14b1defe4c66666 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 9c8d5bb4ad4d21cf5fbf534bb0e74dea08a193808c568bdee12be4928080cd40 all runs: crashed: KASAN: use-after-free Read in v4l2_open representative crash: KASAN: use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h56m33.415531645s (build: 1h10m34.259461639s, test: 1h14m38.95797656s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.180 crash: KASAN: use-after-free Read in v4l2_open ================================================================== BUG: KASAN: use-after-free in v4l2_open+0x286/0x290 drivers/media/v4l2-core/v4l2-dev.c:432 Read of size 4 at addr ffff88812f37c7e0 by task v4l_id/4139 CPU: 0 PID: 4139 Comm: v4l_id Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x126/0x1ab lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 v4l2_open+0x286/0x290 drivers/media/v4l2-core/v4l2-dev.c:432 chrdev_open+0x4d4/0x5e0 fs/char_dev.c:414 do_dentry_open+0x603/0xd10 fs/open.c:882 do_open fs/namei.c:3634 [inline] path_openat+0x1f60/0x2530 fs/namei.c:3791 do_filp_open+0x1dd/0x3d0 fs/namei.c:3818 do_sys_openat2+0x11b/0x410 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0xf0/0x120 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb4d2e04407 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:00007ffd58d1f2b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fb4d2d16880 RCX: 00007fb4d2e04407 RDX: 0000000000000000 RSI: 00007ffd58d20f1e RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffd58d1f500 R14: 00007fb4d3592000 R15: 0000556e4f2734d8 Allocated by task 4085: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] em28xx_v4l2_init+0xe3/0x25d0 drivers/media/usb/em28xx/em28xx-video.c:2538 em28xx_init_extension+0x115/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x73f/0xe90 kernel/workqueue.c:2292 worker_thread+0x820/0xe30 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 4085: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3700 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2118 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x11e6/0x25d0 drivers/media/usb/em28xx/em28xx-video.c:2907 em28xx_init_extension+0x115/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work+0x73f/0xe90 kernel/workqueue.c:2292 worker_thread+0x820/0xe30 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 ffff88812f37c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2016 bytes inside of 8192-byte region [ffff88812f37c000, ffff88812f37e000) The buggy address belongs to the physical page: page:ffffea0004bcde00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12f378 head:ffffea0004bcde00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 dead000000000100 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 2679, tgid 2679 (syz-executor), ts 54089064393, free_ts 41890830147 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x260/0x290 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x2c24/0x2d60 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x430 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x70/0x250 mm/slub.c:1997 ___slab_alloc+0x9d2/0xe40 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x11c/0x250 mm/slub.c:3398 kmalloc_trace+0x26/0xc0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ipv4_sysctl_init_net+0x1fd/0x280 net/ipv4/sysctl_net_ipv4.c:1439 ops_init+0x273/0x3e0 net/core/net_namespace.c:138 setup_net+0x514/0xbc0 net/core/net_namespace.c:336 copy_net_ns+0x2a4/0x4a0 net/core/net_namespace.c:508 create_new_namespaces+0x3a4/0x690 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xda/0x120 kernel/nsproxy.c:226 ksys_unshare+0x380/0x690 kernel/fork.c:3285 __do_sys_unshare kernel/fork.c:3359 [inline] __se_sys_unshare kernel/fork.c:3357 [inline] __x64_sys_unshare+0x2f/0x40 kernel/fork.c:3357 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x78f/0x800 mm/page_alloc.c:3414 free_unref_page_list+0xb8/0x810 mm/page_alloc.c:3555 release_pages+0x14e1/0x1670 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:60 [inline] tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu+0xf2/0x1e0 mm/mmu_gather.c:262 zap_pte_range mm/memory.c:1523 [inline] zap_pmd_range mm/memory.c:1572 [inline] zap_pud_range mm/memory.c:1601 [inline] zap_p4d_range mm/memory.c:1622 [inline] unmap_page_range+0x1533/0x1690 mm/memory.c:1643 unmap_vmas+0x25b/0x340 mm/memory.c:1728 exit_mmap+0x1e9/0x6c0 mm/mmap.c:3250 __mmput+0x61/0x290 kernel/fork.c:1206 exit_mm+0x170/0x210 kernel/exit.c:572 do_exit+0x696/0x1fb0 kernel/exit.c:874 do_group_exit+0x19a/0x250 kernel/exit.c:1030 get_signal+0xec4/0x1040 kernel/signal.c:2880 arch_do_signal_or_restart+0xd1/0x11f0 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6b/0xd0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xa8/0x100 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:303 Memory state around the buggy address: ffff88812f37c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812f37c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88812f37c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88812f37c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812f37c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================