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Message-ID: <68bba4fb.050a0220.192772.01a4.GAE@google.com> Date: Fri, 05 Sep 2025 20:05:31 -0700 From: syzbot <syzbot+039eab266c6321a174bd@...kaller.appspotmail.com> To: akpm@...ux-foundation.org, gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, pasha.tatashin@...een.com, syzkaller-bugs@...glegroups.com, tj@...nel.org Subject: Re: [syzbot] [kernfs?] [mm?] INFO: rcu detected stall in hub_event (2) syzbot has found a reproducer for the following issue on: HEAD commit: c8ed9b5c02a5 Merge tag 'drm-fixes-2025-09-05' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11bd5312580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4703ac89d9e185a dashboard link: https://syzkaller.appspot.com/bug?extid=039eab266c6321a174bd compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16e32962580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/692cc72cb948/disk-c8ed9b5c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9b6b3b9063a8/vmlinux-c8ed9b5c.xz kernel image: https://storage.googleapis.com/syzbot-assets/c1e4adfb8df2/bzImage-c8ed9b5c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+039eab266c6321a174bd@...kaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6120/1:b..l rcu: (detected by 1, t=10502 jiffies, g=10197, q=29931 ncpus=2) task:kworker/0:6 state:R running task stack:24872 pid:6120 tgid:6120 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288 irqentry_exit+0x36/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:kernfs_root+0x189/0x2a0 fs/kernfs/kernfs-internal.h:76 Code: ff 48 c7 c2 c0 58 c3 8b be 4a 03 00 00 48 c7 c7 20 59 c3 8b c6 05 d9 b6 32 0e 01 e8 a1 9c 36 ff e9 c9 fe ff ff e8 67 b2 5a ff <e8> e2 ec 3e ff 31 ff 41 89 c4 89 c6 e8 96 ad 5a ff 45 85 e4 0f 85 RSP: 0018:ffffc900039cebe0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff88805d1fd0f0 RCX: ffffffff8260dac6 RDX: ffff88807be50000 RSI: ffffffff8260dbc9 RDI: 0000000000000005 RBP: ffff888074793960 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000000041ed R14: 00000000000041ed R15: 0000000000000000 kernfs_new_node+0x11f/0x1e0 fs/kernfs/dir.c:713 kernfs_create_dir_ns+0x4c/0x1a0 fs/kernfs/dir.c:1083 sysfs_create_dir_ns+0x13a/0x2b0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x2c4/0x9b0 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_add+0x16e/0x240 lib/kobject.c:426 device_add+0x288/0x1aa0 drivers/base/core.c:3627 cdev_device_add+0xc2/0x1e0 fs/char_dev.c:556 evdev_connect+0x3a4/0x4c0 drivers/input/evdev.c:1383 input_attach_handler.isra.0+0x176/0x250 drivers/input/input.c:993 input_register_device+0xab9/0x1180 drivers/input/input.c:2412 usb_probe+0x10b2/0x17c0 drivers/input/misc/yealink.c:928 usb_probe_interface+0x303/0xa40 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x1148/0x1aa0 drivers/base/core.c:3689 usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250 usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1031 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x1148/0x1aa0 drivers/base/core.c:3689 usb_new_device+0xd07/0x1a60 drivers/usb/core/hub.c:2694 hub_port_connect drivers/usb/core/hub.c:5566 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x2f34/0x4fe0 drivers/usb/core/hub.c:5952 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> rcu: rcu_preempt kthread starved for 2845 jiffies! g10197 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:27784 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7058 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 66 cf 55 00 48 89 df 5b e9 ed 56 5b 00 be 03 00 00 00 5b e9 82 fd 27 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 34 24 65 48 8b 15 d8 11 1b 12 65 8b 05 e9 11 1b RSP: 0018:ffffc90000ac7880 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880b8442000 RCX: ffffffff81af8ea1 RDX: ffff8881436fa440 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffed1017088401 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881247b6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f829e1729a0 CR3: 000000000e380000 CR4: 00000000003526f0 Call Trace: <TASK> native_pause arch/x86/include/asm/vdso/processor.h:13 [inline] cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xdfb/0x1600 kernel/smp.c:877 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1044 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:850 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:842 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_ctl_callback - urb status -71 yealink 2-1:36.0: urb_irq_callback - urb status -71 yealink 2-1:36.0: unexpected response 0 yealink 2-1:36.0: urb_irq_callback - usb_submit_urb failed -19 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 yealink 3-1:36.0: urb_irq_callback - urb status -71 yealink 3-1:36.0: unexpected response 0 yealink 3-1:36.0: urb_ctl_callback - urb status -71 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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