INFO: task syz-executor.3:30107 blocked for more than 140 seconds. Not tainted 4.14.290-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28880 30107 7987 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223 usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ff934a0b209 RSP: 002b:00007ff933380168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff934b1df60 RCX: 00007ff934a0b209 RDX: 0000000020000080 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007ff934a65161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd6564b72f R14: 00007ff933380300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1522: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1522 Comm: khungtaskd Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 30179 Comm: syz-executor.3 Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 task: ffff888088ee6600 task.stack: ffff8880995a0000 RIP: 0010:unwind_next_frame+0x3dd/0x17d0 arch/x86/kernel/unwind_orc.c:421 RSP: 0018:ffff8880995a74c0 EFLAGS: 00000097 RAX: 0000000000000000 RBX: 1ffff110132b4e9f RCX: ffffffff8a7175f4 RDX: ffff8880995a7950 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff8a7175f8 R09: ffffffff8a7175f9 R10: 000000000001c222 R11: 0000000000000001 R12: ffff8880995a75b5 R13: ffff8880995a75b8 R14: ffff8880995a75d0 R15: ffff8880995a7580 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa7bd632718 CR3: 0000000008e6a000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 pte_lock_deinit include/linux/mm.h:1774 [inline] pgtable_page_dtor include/linux/mm.h:1806 [inline] ___pte_free_tlb+0x44/0xc0 arch/x86/mm/pgtable.c:59 __pte_free_tlb arch/x86/include/asm/pgalloc.h:73 [inline] free_pte_range mm/memory.c:471 [inline] free_pmd_range mm/memory.c:489 [inline] free_pud_range mm/memory.c:523 [inline] free_p4d_range mm/memory.c:556 [inline] free_pgd_range+0x84b/0xcd0 mm/memory.c:636 free_pgtables+0x1ec/0x2b0 mm/memory.c:668 exit_mmap+0x27f/0x4d0 mm/mmap.c:3059 __mmput kernel/fork.c:931 [inline] mmput kernel/fork.c:952 [inline] mmput+0xfa/0x420 kernel/fork.c:947 exit_mm kernel/exit.c:548 [inline] do_exit+0x984/0x2850 kernel/exit.c:855 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f2442ad5209 RSP: 002b:00007f244144a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f2442be7f68 RCX: 00007f2442ad5209 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2442be7f68 RBP: 00007f2442be7f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2442be7f6c R13: 00007fff3432559f R14: 00007f244144a300 R15: 0000000000022000 Code: 89 74 24 58 e8 a5 fa ff ff 4c 8b 44 24 18 84 c0 48 8b 4c 24 20 4c 8b 4c 24 28 74 2c 0f b6 41 05 83 e0 03 3c 01 0f 84 3b 07 00 00 <3c> 02 0f 84 b6 05 00 00 84 c0 0f 84 81 08 00 00 80 3d 76 a6 e5