ci2 starts bisection 2026-10-07 07:18:31.308120725 +0000 UTC m=+113431.382286780 bisecting fixing commit since 0eb903b5b519d037c723d47a58c5d4f20eed7342 building syzkaller on 1e72964b0111319984575e60f266d1fa0a98abb5 ensuring issue is reproducible on original commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: b43131a73897178feac45afc8e44e7cfa1b635c5c4ef5cd882ad0fcc2c676d7c run #0: crashed: general protection fault in set_link_state run #1: crashed: general protection fault in set_link_state run #2: crashed: general protection fault in set_link_state run #3: crashed: general protection fault in set_link_state run #4: crashed: general protection fault in dummy_udc_start run #5: crashed: general protection fault in set_link_state run #6: crashed: general protection fault in set_link_state run #7: crashed: general protection fault in set_link_state run #8: crashed: general protection fault in set_link_state run #9: crashed: general protection fault in set_link_state run #10: crashed: general protection fault in set_link_state run #11: crashed: general protection fault in set_link_state run #12: crashed: general protection fault in set_link_state run #13: crashed: general protection fault in set_link_state run #14: crashed: general protection fault in set_link_state run #15: crashed: general protection fault in set_link_state run #16: crashed: general protection fault in set_link_state run #17: crashed: general protection fault in set_link_state run #18: crashed: general protection fault in set_link_state run #19: crashed: general protection fault in set_link_state representative crash: general protection fault in set_link_state, types: [DoS] check whether we can drop unnecessary instrumentation disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c046c3fa224cc4e1742825c4e077ce82b4edc24f4453029f61aa6496cb1f1a6f all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start representative crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed kconfig minimization: base=3707 full=7427 leaves diff=2100 split chunks (needed=false): <2100> split chunk #0 of len 2100 into 5 parts testing without sub-chunk 1/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: d77a834839e6345c7936077952f628989f7adf6ddb735556c75e74fbf21eb0b3 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start representative crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 2bcf1fb4b9f7255a5e1d748379ade957c1619d2f2a9c9cf188460472c60b57ca all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start representative crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f19d59b441f6ca0d9f774acb8dadec05441a42a5da58cd55c2d7212567d86a85 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start representative crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: c56178ac7440631399ac19580f3b126ee5b958201e6c312120e042d0041dc0af all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start representative crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 0eb903b5b519d037c723d47a58c5d4f20eed7342 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: f0f183eaf640a6b1b0bd136fab76adb42a105c2a45285cb7dd087115c72a9335 all runs: OK false negative chance: 0.000 minimized to 420 configs; suspects: [ARCH_ENABLE_MEMORY_HOTREMOVE ATM BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DVB_CORE EXTCON FB FRONTSWAP GPIOLIB HID_ZEROPLUS I2C_MUX IIO IRQ_REMAP 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_HOTPLUG_SPARSE 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_CHIPIDEA USB_CHIPIDEA_HOST USB_CHIPIDEA_IMX USB_CHIPIDEA_MSM USB_CHIPIDEA_PCI USB_CHIPIDEA_TEGRA 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_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 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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_TM6000 VIDEO_TM6000_ALSA VIDEO_TM6000_DVB VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2 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 X86_SGX 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_ONLINE_REPAIR XFS_ONLINE_SCRUB 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 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 kasan locking atomic_sleep], they are not needed testing current HEAD a051a4bf909f76f470ccb3761ee0cf6e2395616e testing commit a051a4bf909f76f470ccb3761ee0cf6e2395616e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 6f9e26eb5a0040791b5c878077e3a0ebf508d420ba1452a2a1c35cfb58b0637c all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start representative crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start, types: [NULL-POINTER-DEREFERENCE] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h11m4.144343012s (build: 22m14.814502771s, test: 1h39m0.571864338s) crash still not fixed or there were kernel test errors commit msg: Linux 5.15.222 crash: BUG: unable to handle kernel NULL pointer dereference in dummy_udc_start BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 1 PID: 3529 Comm: syz-executor384 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:dummy_udc_start+0x17/0x60 drivers/usb/gadget/udc/dummy_hcd.c:1018 Code: 5b 48 89 ef 5d 41 5c e9 b7 9e 5d 00 0f 1f 80 00 00 00 00 55 53 8b 47 70 48 89 f3 83 f8 05 74 40 48 8b 97 60 06 00 00 83 f8 03 <48> 8b 2a 0f 87 24 8c 57 00 85 c0 0f 84 1c 8c 57 00 48 89 ef e8 e0 RSP: 0018:ffffc90000177e50 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff88811f31e050 RCX: ffffc90000177dc4 RDX: 0000000000000000 RSI: ffff88811f31e050 RDI: ffff8881053f4c00 RBP: ffff88811f31e050 R08: 0000000000000000 R09: ffff888112f940e0 R10: 0000000000000002 R11: f000000000000000 R12: 0000000000000000 R13: ffff88811f31e000 R14: ffff88811f31e008 R15: 0000000000000000 FS: 0000555582fdd3c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000119dff000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_gadget_udc_start drivers/usb/gadget/udc/core.c:1150 [inline] udc_bind_to_driver+0xed/0x150 drivers/usb/gadget/udc/core.c:1577 usb_gadget_probe_driver+0x112/0x170 drivers/usb/gadget/udc/core.c:1637 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:549 [inline] raw_ioctl+0x944/0xea0 drivers/usb/gadget/legacy/raw_gadget.c:1256 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x7b/0xb0 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f358f13155b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007fff39b8dea0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f358f13155b RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004 RBP: 00007fff39b8ef70 R08: 0000000000000001 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 R13: 00007f358f1c7b20 R14: 00007fff39b8df40 R15: 0000200000000804 Modules linked in: CR2: 0000000000000000 ---[ end trace 6ea8f4978232fc7c ]--- RIP: 0010:dummy_udc_start+0x17/0x60 drivers/usb/gadget/udc/dummy_hcd.c:1018 Code: 5b 48 89 ef 5d 41 5c e9 b7 9e 5d 00 0f 1f 80 00 00 00 00 55 53 8b 47 70 48 89 f3 83 f8 05 74 40 48 8b 97 60 06 00 00 83 f8 03 <48> 8b 2a 0f 87 24 8c 57 00 85 c0 0f 84 1c 8c 57 00 48 89 ef e8 e0 RSP: 0018:ffffc90000177e50 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff88811f31e050 RCX: ffffc90000177dc4 RDX: 0000000000000000 RSI: ffff88811f31e050 RDI: ffff8881053f4c00 RBP: ffff88811f31e050 R08: 0000000000000000 R09: ffff888112f940e0 R10: 0000000000000002 R11: f000000000000000 R12: 0000000000000000 R13: ffff88811f31e000 R14: ffff88811f31e008 R15: 0000000000000000 FS: 0000555582fdd3c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000119dff000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 5b pop %rbx 1: 48 89 ef mov %rbp,%rdi 4: 5d pop %rbp 5: 41 5c pop %r12 7: e9 b7 9e 5d 00 jmp 0x5d9ec3 c: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 13: 55 push %rbp 14: 53 push %rbx 15: 8b 47 70 mov 0x70(%rdi),%eax 18: 48 89 f3 mov %rsi,%rbx 1b: 83 f8 05 cmp $0x5,%eax 1e: 74 40 je 0x60 20: 48 8b 97 60 06 00 00 mov 0x660(%rdi),%rdx 27: 83 f8 03 cmp $0x3,%eax * 2a: 48 8b 2a mov (%rdx),%rbp <-- trapping instruction 2d: 0f 87 24 8c 57 00 ja 0x578c57 33: 85 c0 test %eax,%eax 35: 0f 84 1c 8c 57 00 je 0x578c57 3b: 48 89 ef mov %rbp,%rdi 3e: e8 .byte 0xe8 3f: e0 .byte 0xe0