Hi, Syzkaller found the following issue: HEAD commit: 75acfdb Linux 5.16-rc8 git tree: upstream console output: https://pastebin.com/raw/YNZPt1rA kernel config: https://pastebin.com/raw/XsnKfdRt And hope the report log can help you. INFO: task syz-executor.0:19780 blocked for more than 143 seconds. Not tainted 5.16.0-rc8+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27920 pid:19780 ppid: 6935 flags:0x00000004 Call Trace: <TASK> __schedule+0xcd9/0x2550 schedule+0xd2/0x260 schedule_preempt_disabled+0xf/0x20 __mutex_lock+0xc48/0x1610 usbdev_release+0x83/0x4b0 __fput+0x286/0x9f0 task_work_run+0xe0/0x1a0 exit_to_user_mode_prepare+0x28d/0x2a0 syscall_exit_to_user_mode+0x19/0x60 do_syscall_64+0x42/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1f192b314b RSP: 002b:00007ffca3bbe190 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f1f192b314b RDX: 0000001b2cb20000 RSI: 0000001b2cb27818 RDI: 0000000000000003 RBP: 00007f1f1942496c R08: 0000000000000000 R09: 00000000f369be85 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000005e35a R13: 00007ffca3bbe2d0 R14: 00007f1f19422f6c R15: 000000000005e0f1 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/60: #0: ffffffff8bb80ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 1 lock held by systemd-journal/3113: 1 lock held by in:imklog/6746: #0: ffff88810a69bcf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 5 locks held by kworker/0:6/15125: #0: ffff88801485d138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8c3/0x16a0 #1: ffffc9000d6afdc8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8f7/0x16a0 #2: ffff888107470220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4090 #3: ffff8881074745c0 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x1b23/0x4090 #4: ffff88801de53368 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x1b4c/0x4090 1 lock held by syz-executor.0/19780: #0: ffff888107470220 (&dev->mutex){....}-{3:3}, at: usbdev_release+0x83/0x4b0 ============================================= NMI backtrace for cpu 6 CPU: 6 PID: 60 Comm: khungtaskd Not tainted 5.16.0-rc8+ #10 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 nmi_cpu_backtrace.cold+0x47/0x144 nmi_trigger_cpumask_backtrace+0x1a1/0x1e0 watchdog+0xcc8/0x1010 kthread+0x405/0x4f0 ret_from_fork+0x1f/0x30 </TASK> Sending NMI from CPU 6 to CPUs 0-5,7: NMI backtrace for cpu 3 CPU: 3 PID: 3113 Comm: systemd-journal Not tainted 5.16.0-rc8+ #10 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:check_preemption_disabled+0xd/0x170 Code: c7 c7 20 32 b5 89 e8 a2 01 00 00 65 c7 05 e7 2b c2 76 00 00 00 00 e9 6b ff ff ff cc cc 41 56 41 55 49 89 f5 41 54 55 48 89 fd <53> 0f 1f 44 00 00 65 44 8b 25 0d f6 c0 76 65 8b 1d 7e 50 c1 76 81 RSP: 0018:ffffc9000133f9b0 EFLAGS: 00000046 RAX: 0000000000000007 RBX: ffffffff8d908dcc RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff89ac1180 RDI: ffffffff8a052060 RBP: ffffffff8a052060 R08: 0000000000000001 R09: fffffbfff1b20b33 R10: ffffffff8d905997 R11: fffffbfff1b20b32 R12: ffffffff8bb80ee0 R13: ffffffff89ac1180 R14: ffff88801da09cc0 R15: ffff88801e87d680 FS: 00007fbe7a3bf8c0(0000) GS:ffff888135c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe778a8000 CR3: 000000001cb07000 CR4: 0000000000350ee0 Call Trace: <TASK> lock_release+0x159/0x670 is_bpf_text_address+0x99/0x170 kernel_text_address+0x39/0x80 __kernel_text_address+0x9/0x30 unwind_get_return_address+0x5a/0xa0 arch_stack_walk+0x93/0xe0 stack_trace_save+0x8c/0xc0 kasan_save_stack+0x1e/0x50 __kasan_record_aux_stack+0xf5/0x120 call_rcu+0xb1/0x740 task_work_run+0xe0/0x1a0 exit_to_user_mode_prepare+0x28d/0x2a0 syscall_exit_to_user_mode+0x19/0x60 do_syscall_64+0x42/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fbe7994f840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffe94670958 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffe94670c60 RCX: 00007fbe7994f840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055abb04f5640 RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055abb04ea040 R14: 00007ffe94670c20 R15: 000055abb04f5460 </TASK> NMI backtrace for cpu 7 skipped: idling at default_idle+0xb/0x10 NMI backtrace for cpu 5 skipped: idling at default_idle+0xb/0x10 NMI backtrace for cpu 4 skipped: idling at default_idle+0xb/0x10 NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 NMI backtrace for cpu 2 skipped: idling at default_idle+0xb/0x10 NMI backtrace for cpu 0 CPU: 0 PID: 96 Comm: kworker/u17:2 Not tainted 5.16.0-rc8+ #10 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x40 Code: 20 8b 7e 81 e2 00 01 ff 00 75 10 65 48 8b 04 25 40 70 02 00 48 8b 80 58 15 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <65> 48 8b 0c 25 40 70 02 00 bf 02 00 00 00 48 89 ce 4c 8b 04 24 e8 RSP: 0018:ffffc9000123fa08 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888063ebfca0 RCX: ffffffff816be2df RDX: 0000000000000000 RSI: ffff888014a69cc0 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: fffffbfff1fee328 R12: ffffed100c7d7f95 R13: 0000000000000002 R14: ffff888063ebfca8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888063e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0004ea0b0 CR3: 000000000b88e000 CR4: 0000000000350ef0 Call Trace: <TASK> smp_call_function_many_cond+0x3d9/0xc20 on_each_cpu_cond_mask+0x56/0xa0 text_poke_bp_batch+0x355/0x560 text_poke_finish+0x16/0x30 arch_jump_label_transform_apply+0x13/0x20 jump_label_update+0x332/0x410 static_key_enable_cpuslocked+0x1b1/0x260 static_key_enable+0x16/0x20 toggle_allocation_gate+0x100/0x390 process_one_work+0x9df/0x16a0 worker_thread+0x90/0xe20 kthread+0x405/0x4f0 ret_from_fork+0x1f/0x30 </TASK> ---------------- Code disassembly (best guess): 0: c7 c7 20 32 b5 89 mov $0x89b53220,%edi 6: e8 a2 01 00 00 callq 0x1ad b: 65 c7 05 e7 2b c2 76 movl $0x0,%gs:0x76c22be7(%rip) # 0x76c22bfd 12: 00 00 00 00 16: e9 6b ff ff ff jmpq 0xffffff86 1b: cc int3 1c: cc int3 1d: 41 56 push %r14 1f: 41 55 push %r13 21: 49 89 f5 mov %rsi,%r13 24: 41 54 push %r12 26: 55 push %rbp 27: 48 89 fd mov %rdi,%rbp * 2a: 53 push %rbx <-- trapping instruction 2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 30: 65 44 8b 25 0d f6 c0 mov %gs:0x76c0f60d(%rip),%r12d # 0x76c0f645 37: 76 38: 65 8b 1d 7e 50 c1 76 mov %gs:0x76c1507e(%rip),%ebx # 0x76c150bd 3f: 81 .byte 0x81
