ci2 starts bisection 2026-09-19 10:16:15.934358705 +0000 UTC m=+98227.311033618 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: dc3d747dc03bd3f79fc75c766e5c5a23bc34ec7c35a517da9fc901ee42928440 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 [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: a5e229cdf9be71876e82f268af2f4c9151dd0de3856dfdac9ffd37cd49e3194a 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 [locking atomic_sleep hang memleak ubsan bug_or_warning], 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: 329e57178a5d2bc6bfb6cab0a2991e3230a59ae77f91c12ad857e8df7dca9789 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], 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: 5e023f0bbe50e2b8e291a02e19c80d25df35eef6d2d28ea91612c42e12d8f9a0 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 [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: 9e1e619e88f876cdb500c0c3fc3c3e1de5e0ada30555f9c4729c23d46a9666c5 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], 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: 330f0387e5714b4677cfcf13dec1ef79f05f521cb505d487f6700e907ebc6ca5 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 [ubsan bug_or_warning locking atomic_sleep hang memleak], 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: b30dd17d66e20cf86d29b9bfe58d7d0c4cea6dc500092061a3630e6fda23f97c run #0: infra problem: failed to create instance: googleapi: Error 503: Internal error. Please try again or contact Google Support. (Code: '65BD55F86F07A.8E940DE.A1130761'), backendError run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: 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 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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 [locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing current HEAD 79643295eba17affbd16ca97f3ef04c90266b28c testing commit 79643295eba17affbd16ca97f3ef04c90266b28c gcc compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 kernel signature: 817aad2283f41e19cfb365d6257f253813c55255ff6c9aa608177e960a5bd5e4 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: 3h9m52.552566094s (build: 1h28m51.317473093s, test: 1h27m58.684934775s) crash still not fixed or there were kernel test errors commit msg: Linux 6.6.157 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 ffff888120024828 by task v4l_id/4700 CPU: 1 PID: 4700 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+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:3683 [inline] path_openat+0x2163/0x27a0 fs/namei.c:3844 do_filp_open+0x1e1/0x3d0 fs/namei.c:3871 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: 0033:0x7f0df4b17407 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:00007ffc9a5b0050 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0df4a29880 RCX: 00007f0df4b17407 RDX: 0000000000000000 RSI: 00007ffc9a5b0f1d RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffc9a5b02a0 R14: 00007f0df52a5000 R15: 000056332983d4d8 Allocated by task 8: 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:2657 [inline] process_scheduled_works+0x8d0/0x11e0 kernel/workqueue.c:2734 worker_thread+0x803/0xc30 kernel/workqueue.c:2815 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 8: 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:2657 [inline] process_scheduled_works+0x8d0/0x11e0 kernel/workqueue.c:2734 worker_thread+0x803/0xc30 kernel/workqueue.c:2815 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 ffff888120024000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2088 bytes inside of freed 8192-byte region [ffff888120024000, ffff888120026000) The buggy address belongs to the physical page: page:ffffea0004800800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120020 head:ffffea0004800800 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 ffffea0004835800 dead000000000004 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 3394, tgid 3394 (syz-executor), ts 60051146552, free_ts 59661165578 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 kmalloc_trace+0x2a/0xc0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] ipv4_sysctl_init_net+0x1eb/0x260 net/ipv4/sysctl_net_ipv4.c:1550 ops_init+0x291/0x410 net/core/net_namespace.c:139 setup_net+0x3b4/0x9f0 net/core/net_namespace.c:343 copy_net_ns+0x2d2/0x450 net/core/net_namespace.c:524 create_new_namespaces+0x3a4/0x690 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xde/0x120 kernel/nsproxy.c:228 ksys_unshare+0x384/0x690 kernel/fork.c:3444 __do_sys_unshare kernel/fork.c:3518 [inline] __se_sys_unshare kernel/fork.c:3516 [inline] __x64_sys_unshare+0x33/0x40 kernel/fork.c:3516 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 skb_release_data+0x312/0x630 net/core/skbuff.c:982 skb_release_all net/core/skbuff.c:1054 [inline] __kfree_skb net/core/skbuff.c:1068 [inline] napi_consume_skb+0x101/0x3a0 net/core/skbuff.c:1361 skb_defer_free_flush net/core/dev.c:6795 [inline] net_rx_action+0x522/0xb40 net/core/dev.c:6858 handle_softirqs+0x19e/0x4e0 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x44/0xd0 kernel/softirq.c:661 instr_sysvec_call_function_single arch/x86/kernel/smp.c:262 [inline] sysvec_call_function_single+0xa1/0xc0 arch/x86/kernel/smp.c:262 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:694 Memory state around the buggy address: ffff888120024700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888120024780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888120024800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888120024880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888120024900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================