ci2 starts bisection 2026-08-01 14:39:21.905544504 +0000 UTC m=+44155.876557653 bisecting fixing commit since d11359bcf2acd74e38781036f367454765315df0 building syzkaller on 1d2f35898f2e0325486423250d5303b6bc05adcd ensuring issue is reproducible on original commit d11359bcf2acd74e38781036f367454765315df0 testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: fa349644d7e949afcab495893fd1dc25fba33fec366109ac26d3cfd5d9761560 run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: soft lockup in tc_modify_qdisc run #2: crashed: BUG: soft lockup in tc_modify_qdisc run #3: crashed: BUG: soft lockup in tc_modify_qdisc run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: no output from test machine run #13: crashed: no output from test machine run #14: crashed: no output from test machine run #15: crashed: no output from test machine run #16: crashed: BUG: soft lockup in tc_modify_qdisc run #17: crashed: no output from test machine run #18: crashed: no output from test machine run #19: crashed: no output from test machine representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG UNKNOWN] check whether we can drop unnecessary instrumentation disabling configs for [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 7ab4cad4f79d3d3f4c867647ea1796023c5e0816485165f2dd8ae5b6888d06b0 run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: soft lockup in tc_modify_qdisc run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: soft lockup in tc_modify_qdisc run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: BUG: soft lockup in tc_modify_qdisc representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG UNKNOWN] the bug reproduces without the instrumentation disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed kconfig minimization: base=4788 full=6024 leaves diff=248 split chunks (needed=false): <248> split chunk #0 of len 248 into 5 parts testing without sub-chunk 1/5 disabling configs for [locking atomic_sleep memleak ubsan bug_or_warning kasan], they are not needed testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 28ab34a343c173f16f4066dbc77caeec4068b3b78bcdf0992234c19c0f3c89f0 run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: soft lockup in tc_modify_qdisc run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: BUG: workqueue lockup, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 2906535f13c7dc4035397a490311ec189ca5b713e2a2792554547350e608f7a5 run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: soft lockup in tc_modify_qdisc run #3: crashed: BUG: soft lockup in tc_modify_qdisc run #4: crashed: BUG: workqueue lockup run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: BUG: workqueue lockup, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: cb95192f88eaaf653d90b4982d8a2a884b36409009d1d67f371da61d6a1dd034 run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: BUG: workqueue lockup, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 6efc18f8929360c81c519b1fa771fd040426aa34d3c64e3f6d56264fb76dd0a0 run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: workqueue lockup run #5: crashed: BUG: workqueue lockup run #6: crashed: BUG: workqueue lockup run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: BUG: workqueue lockup, types: [UNKNOWN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [kasan locking atomic_sleep memleak ubsan bug_or_warning], they are not needed testing commit d11359bcf2acd74e38781036f367454765315df0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building d11359bcf2acd74e38781036f367454765315df0: net/socket.c:1128:(.text+0x817): undefined reference to `wext_handle_ioctl' net/socket.c:3397:(.text+0xa08): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346:(.text+0x109): undefined reference to `wext_proc_exit' net/core/net-procfs.c:330:(.text+0x1e4): undefined reference to `wext_proc_init' minimized to 48 configs; suspects: [HID_ZEROPLUS USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_DM9601 USB_NET_GL620A USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL USB_SERIAL_FTDI_SIO USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM USB_XHCI_PCI_RENESAS WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS ZEROPLUS_FF] disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing current HEAD 50b3a256e550e98ff6a49d32e77fb67998707961 testing commit 50b3a256e550e98ff6a49d32e77fb67998707961 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 08c250d29a8f97de17479758f0d69c69a3d111b0a9d6cbc537ac9f69d44e0e96 run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: workqueue lockup run #5: crashed: BUG: workqueue lockup run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine representative crash: BUG: workqueue lockup, types: [UNKNOWN] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 2h20m19.721889798s (build: 53m43.629880157s, test: 1h10m7.432175404s) crash still not fixed or there were kernel test errors commit msg: Merge 5.10.260 into android13-5.10-lts crash: BUG: workqueue lockup BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 244s! Showing busy workqueues and worker pools: workqueue events_unbound: flags=0x2 pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/512 refcnt=4 in-flight: 319:linkwatch_event, 9:toggle_allocation_gate workqueue netns: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 in-flight: 48:cleanup_net delayed: cleanup_net workqueue ipv6_addrconf: flags=0x40008 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=54 in-flight: 15:addrconf_dad_work delayed: addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work, addrconf_dad_work , addrconf_dad_work, addrconf_dad_work workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg1: flags=0x24 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_handshake_receive_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg2: flags=0x24 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_handshake_receive_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=0s workers=4 idle: 5 482 53 pool 4: cpus=0-1 flags=0x4 nice=0 hung=1s workers=5 idle: 466 7 NMI backtrace for cpu 0 CPU: 0 PID: 9 Comm: kworker/u4:1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline] RIP: 0010:smp_call_function_single+0xaa/0x140 kernel/smp.c:517 Code: 73 02 9c 58 85 db 74 5f 44 89 e7 48 89 e6 4c 89 74 24 10 4c 89 6c 24 18 e8 43 fe ff ff 41 89 c4 8b 44 24 08 a8 01 74 0a f3 90 <8b> 44 24 08 a8 01 75 f6 bf 01 00 00 00 e8 54 5f f9 ff 65 8b 05 2d RSP: 0018:ffffc9000004fc00 EFLAGS: 00000202 RAX: 0000000000000011 RBX: 0000000000000001 RCX: 0000000000000830 RDX: 0000000000000001 RSI: 00000000000000fb RDI: 0000000000000001 RBP: ffffc9000004fc78 R08: 0000000000000001 R09: 0000000000000008 R10: 0000000000000001 R11: 0000000000000018 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff810a8040 R15: ffffffff82df41f8 FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc7efd4080 CR3: 0000000002c0b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many_cond+0xca/0x270 kernel/smp.c:653 smp_call_function_many kernel/smp.c:716 [inline] smp_call_function kernel/smp.c:738 [inline] on_each_cpu+0x43/0xa0 kernel/smp.c:837 text_poke_sync arch/x86/kernel/alternative.c:1568 [inline] text_poke_bp_batch+0x97/0x230 arch/x86/kernel/alternative.c:1768 text_poke_flush arch/x86/kernel/alternative.c:1959 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1966 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:126 __jump_label_update+0xe4/0xf0 kernel/jump_label.c:459 jump_label_update kernel/jump_label.c:825 [inline] jump_label_update+0x83/0xf0 kernel/jump_label.c:804 static_key_enable_cpuslocked kernel/jump_label.c:177 [inline] static_key_enable_cpuslocked kernel/jump_label.c:164 [inline] static_key_enable+0x5c/0x70 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:624 [inline] toggle_allocation_gate+0x5b/0x190 mm/kfence/core.c:616 process_one_work+0x195/0x330 kernel/workqueue.c:2301 worker_thread+0x4e/0x340 kernel/workqueue.c:2447 kthread+0x14c/0x170 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 ---------------- Code disassembly (best guess): 0: 73 02 jae 0x4 2: 9c pushf 3: 58 pop %rax 4: 85 db test %ebx,%ebx 6: 74 5f je 0x67 8: 44 89 e7 mov %r12d,%edi b: 48 89 e6 mov %rsp,%rsi e: 4c 89 74 24 10 mov %r14,0x10(%rsp) 13: 4c 89 6c 24 18 mov %r13,0x18(%rsp) 18: e8 43 fe ff ff call 0xfffffe60 1d: 41 89 c4 mov %eax,%r12d 20: 8b 44 24 08 mov 0x8(%rsp),%eax 24: a8 01 test $0x1,%al 26: 74 0a je 0x32 28: f3 90 pause * 2a: 8b 44 24 08 mov 0x8(%rsp),%eax <-- trapping instruction 2e: a8 01 test $0x1,%al 30: 75 f6 jne 0x28 32: bf 01 00 00 00 mov $0x1,%edi 37: e8 54 5f f9 ff call 0xfff95f90 3c: 65 gs 3d: 8b .byte 0x8b 3e: 05 .byte 0x5 3f: 2d .byte 0x2d