ci2 starts bisection 2026-06-30 16:22:38.243090077 +0000 UTC m=+9821.845694959 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: d01b397f2de136c32897e1e3909b9b9b153c40a74f66146ae7f11fd422bf0286 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 [bug_or_warning locking atomic_sleep hang memleak ubsan], 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: 5526cedf9395d5e98dd563983e62c72a92c174d053463f5dbcfc1e88ba1b26c3 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], 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 [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: ed40d58c17708fc47d4e049ae03e46a410ce7936a7abb815b17324a45b41c76c 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: 3b77bd322798ea6cf3c406b3362cab0e8586df8b5f7785420f131f80ff1fba75 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 [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: 731e6284ebf1ace8cff6e803f15e1b1559a7c6cdf6dbb0d7cb66a59a3eda4036 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 [bug_or_warning locking atomic_sleep hang memleak ubsan], 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: b5b1e3d6a889c80e323d11272cc7f1b3d39a50d7bf6cfbd9a2200560af7af9c1 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 [bug_or_warning locking atomic_sleep hang memleak ubsan], 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: 3731893602d9189f8fcfebe50cb8a335a864bc8e4f644d3f5bff6cd259a29ab4 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing current HEAD fdb6fcb41cc741ad5eaa7995f278dfcb94fdf795 testing commit fdb6fcb41cc741ad5eaa7995f278dfcb94fdf795 gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: b5944ca79b3dbf6084616f9be87d79eacfa34ba9b6fc62693bc0854f12818fea 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: 2h43m48.52947721s (build: 1h4m40.993062649s, test: 1h21m58.236525862s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.176 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 ffff88811e9c07e0 by task v4l_id/4137 CPU: 0 PID: 4137 Comm: v4l_id Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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: 0033:0x7f767226e407 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:00007ffeb7fd1bc0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f7672180880 RCX: 00007f767226e407 RDX: 0000000000000000 RSI: 00007ffeb7fd2f1e RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffeb7fd1e10 R14: 00007f76729fc000 R15: 000055ac54d9a4d8 Allocated by task 21: 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 21: 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 ffff88811e9c0000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2016 bytes inside of 8192-byte region [ffff88811e9c0000, ffff88811e9c2000) The buggy address belongs to the physical page: page:ffffea00047a7000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e9c0 head:ffffea00047a7000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 ffffea000498f000 dead000000000002 ffff888100042280 raw: 0000000000000000 0000000080020002 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 2621, tgid 2621 (syz-executor), ts 55285580401, free_ts 54819719891 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 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0x93/0x1c0 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x3c/0xe0 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvmalloc_array include/linux/slab.h:734 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] wg_packet_queue_init+0x79/0x2b0 drivers/net/wireguard/queueing.c:32 wg_newlink+0x3a9/0x660 drivers/net/wireguard/device.c:357 rtnl_newlink_create net/core/rtnetlink.c:3428 [inline] __rtnl_newlink net/core/rtnetlink.c:3648 [inline] rtnl_newlink+0x115e/0x1aa0 net/core/rtnetlink.c:3661 rtnetlink_rcv_msg+0x6d0/0xb30 net/core/rtnetlink.c:6158 netlink_rcv_skb+0x1e4/0x390 net/netlink/af_netlink.c:2516 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x55c/0x770 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6ef/0xa00 net/netlink/af_netlink.c:1877 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+0x2e/0x3a0 mm/page_alloc.c:3509 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:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4d/0x400 mm/slab.h:737 kmem_cache_alloc_bulk+0x2e5/0x380 mm/slub.c:3880 mt_alloc_bulk lib/maple_tree.c:159 [inline] mas_alloc_nodes+0x460/0x6e0 lib/maple_tree.c:1301 mas_node_count_gfp lib/maple_tree.c:1361 [inline] mas_preallocate+0x113/0x2d0 lib/maple_tree.c:5809 __mmap_region mm/mmap.c:2765 [inline] mmap_region+0xaf5/0x14f0 mm/mmap.c:2916 do_mmap+0x6c6/0xbd0 mm/mmap.c:1436 vm_mmap_pgoff+0x191/0x270 mm/util.c:520 elf_map+0x160/0x270 fs/binfmt_elf.c:375 elf_load+0x67/0x2e0 fs/binfmt_elf.c:393 load_elf_binary+0xdfb/0x2170 fs/binfmt_elf.c:1206 search_binary_handler fs/exec.c:1764 [inline] exec_binprm fs/exec.c:1805 [inline] bprm_execve+0x7d2/0x11f0 fs/exec.c:1874 Memory state around the buggy address: ffff88811e9c0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811e9c0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811e9c0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811e9c0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811e9c0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================