Hello, syzbot found the following issue on: HEAD commit: 7271b2a53042 Add linux-next specific files for 20230818 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=10e05763a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=1936af09cdef7dd6 dashboard link: https://syzkaller.appspot.com/bug?extid=f7ac46d91cf13b4591a4 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1085e265a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14290117a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d81109bc02c1/disk-7271b2a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4b3bf8e2a4f7/vmlinux-7271b2a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/6404cd473c1e/bzImage-7271b2a5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f7ac46d91cf13b4591a4@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task kworker/0:1:9 blocked for more than 143 seconds. Not tainted 6.5.0-rc6-next-20230818-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1 state:D stack:26768 pid:9 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> context_switch kernel/sched/core.c:5382 [inline] __schedule+0xee1/0x59f0 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 usb_kill_urb.part.0+0x1c6/0x250 drivers/usb/core/urb.c:713 usb_kill_urb+0x83/0xa0 drivers/usb/core/urb.c:702 usb_start_wait_urb+0x251/0x4c0 drivers/usb/core/message.c:65 usb_internal_control_msg drivers/usb/core/message.c:103 [inline] usb_control_msg+0x327/0x4a0 drivers/usb/core/message.c:154 get_bMaxPacketSize0.constprop.0+0xa5/0x1c0 drivers/usb/core/hub.c:4725 hub_port_init+0x680/0x3850 drivers/usb/core/hub.c:4921 hub_port_connect drivers/usb/core/hub.c:5369 [inline] hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] port_event drivers/usb/core/hub.c:5740 [inline] hub_event+0x2b64/0x4e00 drivers/usb/core/hub.c:5822 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.5.0-rc6-next-20230818-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfac/0x1230 kernel/hung_task.c:379 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5041 Comm: strace-static-x Not tainted 6.5.0-rc6-next-20230818-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:wait_consider_task+0x94/0x4030 kernel/exit.c:1391 Code: c7 40 08 00 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 f0 00 00 00 31 c0 e8 67 da 38 00 4c 89 f8 48 c1 e8 03 0f b6 14 28 <4c> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d8 18 00 00 45 RSP: 0018:ffffc90003cdfb30 EFLAGS: 00000a06 RAX: 1ffff1100ddcfbcf RBX: ffffc90003cdfcf8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff814ef909 RDI: ffffc90003cdfcf8 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88806ee7d940 R14: 0000000000000000 R15: ffff88806ee7de78 FS: 0000000000ad73c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbbc40e6c00 CR3: 0000000027552000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> ptrace_do_wait kernel/exit.c:1514 [inline] do_wait+0x88c/0xc70 kernel/exit.c:1621 kernel_wait4+0x16d/0x280 kernel/exit.c:1780 __do_sys_wait4+0x15b/0x170 kernel/exit.c:1808 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x4d6ad6 Code: 00 00 00 90 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24 RSP: 002b:00007fff4d5e5ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004d6ad6 RDX: 0000000040000000 RSI: 00007fff4d5e5eec RDI: 00000000ffffffff RBP: 0000000000000000 R08: 0000000000000017 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000add3f0 R13: 00007fff4d5e5eec R14: 0000000000ad8b90 R15: 000000000063f160 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.221 msecs --- This report is generated by a bot. 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