ci2 starts bisection 2026-07-12 17:59:37.767190047 +0000 UTC m=+143906.173477481 bisecting fixing commit since 3b9f64db049687c0d38b4b3ef2f297f0642179af building syzkaller on 6ccb967e465e832a7bfd7a116ad00d52a0923a5d ensuring issue is reproducible on original commit 3b9f64db049687c0d38b4b3ef2f297f0642179af testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: da75aac12048cfb78df05289e419420463e2c8ad05ecdd4b86dd2e0b512af287 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] check whether we can drop unnecessary instrumentation disabling configs for [hang memleak ubsan bug_or_warning locking atomic_sleep], they are not needed testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 58f4c4a4f3abd1ffdfb4b948b8ace1a2ec99b5693b190d9c4256b56664701c92 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] the bug reproduces without the instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed kconfig minimization: base=3913 full=7800 leaves diff=2159 split chunks (needed=false): <2159> split chunk #0 of len 2159 into 5 parts testing without sub-chunk 1/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 269b48f33466a985d27ca4d2a1b31f2bbc0c2406e103911e0a00099e52cade68 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: cc195513a18d3310d0722f8bd5277d4f586a6e141cc00d9a4090309a4b185369 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 36b212ec5ef52fd4a3c60a5802e6df555b8f2308f1f4b85eec97f34fc605bce2 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning locking], they are not needed testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 0ab79c8c68fe931e008f85421cbb4c5dab3760ebd612e8a4271d0c948ae924a9 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-use-after-free Read in v4l2_open, types: [KASAN-USE-AFTER-FREE-READ] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit 3b9f64db049687c0d38b4b3ef2f297f0642179af gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: cfa494a5cdd94ba50a1fb59a817220be8c75b572ac3622f5ecc1d03113717bd3 all runs: OK false negative chance: 0.000 minimized to 431 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 IOMMUFD 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 SOUND SPI SSB TAP TARGET_CORE TUN USB_AMD5536UDC USB_ATM USB_BELKIN USB_C67X00_HCD USB_CATC USB_CDC_PHONET USB_CDNS2_UDC USB_CDNS3 USB_CDNS3_GADGET USB_CDNS3_HOST USB_CDNS3_PCI_WRAP USB_CDNSP_GADGET USB_CDNSP_HOST USB_CDNSP_PCI USB_CDNS_HOST USB_CDNS_SUPPORT USB_CHAOSKEY USB_CHIPIDEA USB_CHIPIDEA_GENERIC USB_CHIPIDEA_HOST USB_CHIPIDEA_MSM USB_CHIPIDEA_PCI USB_CHIPIDEA_UDC USB_CONFIGFS USB_CONFIGFS_ACM USB_CONFIGFS_ECM 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_MIDI2 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 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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_NOMODESET VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 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_USER_SHADOW_STACK 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 da47cbc254661aa66d61ef061485a7080305c4be testing commit da47cbc254661aa66d61ef061485a7080305c4be gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 96d11284b09aea9bf747d2b383918c09ac70513c2dff2e69b66dd0c0dd521c34 all runs: crashed: KASAN: slab-use-after-free Read in v4l2_open representative crash: KASAN: slab-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: 3h16m8.498397853s (build: 1h41m54.62345136s, test: 1h15m21.765381958s) crash still not fixed or there were kernel test errors commit msg: Linux 6.6.144 crash: KASAN: slab-use-after-free Read in v4l2_open ================================================================== BUG: KASAN: slab-use-after-free in v4l2_open+0x28d/0x2a0 drivers/media/v4l2-core/v4l2-dev.c:432 Read of size 4 at addr ffff8881073a4828 by task v4l_id/4639 CPU: 1 PID: 4639 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+0x12a/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 v4l2_open+0x28d/0x2a0 drivers/media/v4l2-core/v4l2-dev.c:432 chrdev_open+0x4db/0x5f0 fs/char_dev.c:414 do_dentry_open+0x6a3/0xf70 fs/open.c:929 do_open fs/namei.c:3640 [inline] path_openat+0x2163/0x27a0 fs/namei.c:3797 do_filp_open+0x1e1/0x3d0 fs/namei.c:3824 do_sys_openat2+0xfc/0x180 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0xf4/0x120 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2e0baa7407 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:00007fff8d930cb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f2e0b9b9880 RCX: 00007f2e0baa7407 RDX: 0000000000000000 RSI: 00007fff8d931f1d RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007fff8d930f00 R14: 00007f2e0c235000 R15: 000056022a7b74d8 Allocated by task 4621: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] em28xx_v4l2_init+0xe7/0x25d0 drivers/media/usb/em28xx/em28xx-video.c:2538 em28xx_init_extension+0x119/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0x8d0/0x11e0 kernel/workqueue.c:2730 worker_thread+0x803/0xc30 kernel/workqueue.c:2811 kthread+0x229/0x280 kernel/kthread.c:388 ret_from_fork+0x2f/0x60 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Freed by task 4621: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] __kmem_cache_free+0xba/0x1f0 mm/slub.c:3843 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2118 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x11ea/0x25d0 drivers/media/usb/em28xx/em28xx-video.c:2907 em28xx_init_extension+0x119/0x180 drivers/media/usb/em28xx/em28xx-core.c:1116 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0x8d0/0x11e0 kernel/workqueue.c:2730 worker_thread+0x803/0xc30 kernel/workqueue.c:2811 kthread+0x229/0x280 kernel/kthread.c:388 ret_from_fork+0x2f/0x60 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff8881073a4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2088 bytes inside of freed 8192-byte region [ffff8881073a4000, ffff8881073a6000) The buggy address belongs to the physical page: page:ffffea00041ce800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1073a0 head:ffffea00041ce800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x200000000000840(slab|head|node=0|zone=2) page_type: 0xffffffff() raw: 0200000000000840 ffff888100042280 ffffea00046afc00 0000000000000006 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 3436, tgid 3436 (syz-executor), ts 51195566062, free_ts 51053531362 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x24d/0x290 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2b18/0x2c50 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x430 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x70/0x250 mm/slub.c:2081 ___slab_alloc+0xa32/0xee0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x118/0x230 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x97/0x1c0 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x40/0xf0 mm/util.c:617 kvmalloc include/linux/slab.h:738 [inline] kvmalloc_array include/linux/slab.h:756 [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+0xa0/0x2d0 drivers/net/wireguard/queueing.c:32 wg_newlink+0x360/0x690 drivers/net/wireguard/device.c:353 rtnl_newlink_create net/core/rtnetlink.c:3521 [inline] __rtnl_newlink net/core/rtnetlink.c:3741 [inline] rtnl_newlink+0x11a2/0x1b30 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x7bd/0xc80 net/core/rtnetlink.c:6476 netlink_rcv_skb+0x23c/0x400 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x560/0x780 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x711/0xa20 net/netlink/af_netlink.c:1899 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x79d/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x290 mm/page_alloc.c:2459 discard_slab mm/slub.c:2127 [inline] __unfreeze_partials+0x1a4/0x1e0 mm/slub.c:2667 put_cpu_partial+0x14c/0x1b0 mm/slub.c:2743 __slab_free+0x293/0x370 mm/slub.c:3700 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x66/0x430 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x174/0x280 mm/slub.c:3519 getname_flags+0xa4/0x440 fs/namei.c:140 user_path_at_empty+0x1f/0x50 fs/namei.c:2916 do_readlinkat+0xc6/0x380 fs/stat.c:494 __do_sys_readlink fs/stat.c:527 [inline] __se_sys_readlink fs/stat.c:524 [inline] __x64_sys_readlink+0x7a/0x90 fs/stat.c:524 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8881073a4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881073a4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881073a4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881073a4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881073a4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================