usbtmc 3-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 rcu: INFO: rcu_sched self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=1b6/1/0x4000000000000000 softirq=7571/7572 fqs=10 (t=10501 jiffies g=6169 q=282) rcu: rcu_sched kthread starved for 7745 jiffies! g6169 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_sched state:I stack:29616 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x920/0x1fa0 kernel/sched/core.c:5073 schedule+0xcb/0x270 kernel/sched/core.c:5152 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892 rcu_gp_fqs_loop kernel/rcu/tree.c:2005 [inline] rcu_gp_kthread+0xa36/0x1ba0 kernel/rcu/tree.c:2178 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 52 Comm: kworker/u4:2 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:__kasan_check_read+0x0/0x10 mm/kasan/shadow.c:31 Code: 86 e8 d6 96 17 04 48 85 db 0f 85 51 e0 18 04 48 83 c4 60 5b 5d 41 5c 41 5d c3 c3 e9 51 e1 18 04 cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 23 f9 ff ff 0f 1f 00 48 8b 0c 24 89 f6 RSP: 0018:ffffc900002e71f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffea0004680380 RCX: 0000000000000000 RDX: ffff888100a01b40 RSI: 0000000000000008 RDI: ffffea0004680380 RBP: ffffea0004680380 R08: 0000000000000000 R09: ffffea0004680387 R10: ffffffff815b6303 R11: 0000000000000000 R12: 0000000000000000 R13: ffffea0004680348 R14: ffffea0004680348 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000028813bc CR3: 00000001038d4000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] PageSwapBacked include/linux/page-flags.h:357 [inline] PageSwapCache include/linux/page-flags.h:401 [inline] page_mapping+0x1ee/0x490 mm/util.c:699 __test_set_page_writeback+0x7d/0xda0 mm/page-writeback.c:2768 set_page_writeback include/linux/page-flags.h:562 [inline] ext4_bio_write_page+0x26b/0x1950 fs/ext4/page-io.c:455 mpage_submit_page+0x127/0x220 fs/ext4/inode.c:2102 mpage_map_and_submit_buffers fs/ext4/inode.c:2350 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2489 [inline] ext4_writepages+0x23b0/0x3a20 fs/ext4/inode.c:2802 do_writepages+0xec/0x290 mm/page-writeback.c:2352 __writeback_single_inode+0x126/0xe90 fs/fs-writeback.c:1467 writeback_sb_inodes+0x567/0x1010 fs/fs-writeback.c:1732 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1801 wb_writeback+0x7b1/0xb80 fs/fs-writeback.c:1907 wb_check_old_data_flush fs/fs-writeback.c:2009 [inline] wb_do_writeback fs/fs-writeback.c:2062 [inline] wb_workfn+0x82e/0x10b0 fs/fs-writeback.c:2091 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x143/0x1db lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x46/0xe0 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1da/0x200 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:341 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline] check_cpu_stall kernel/rcu/tree_stall.h:697 [inline] rcu_pending kernel/rcu/tree.c:3830 [inline] rcu_sched_clock_irq.cold+0x51f/0xada kernel/rcu/tree.c:2650 update_process_times+0x139/0x1b0 kernel/time/timer.c:1796 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1a4/0x2c0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x1c0/0xd80 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x2fc/0x9b0 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0xf5/0x420 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x2f/0x90 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:_raw_spin_unlock_irqrestore+0x3a/0x50 kernel/locking/spinlock.c:192 Code: 10 e8 ca 7c 75 fb 48 89 ef e8 a2 30 76 fb 81 e3 00 02 00 00 75 17 9c 58 f6 c4 02 75 17 48 85 db 74 01 fb 65 ff 0d 36 18 50 7a <5b> 5d c3 e8 be 62 94 fb eb e2 e8 b7 85 fe ff eb e2 0f 1f 44 00 00 RSP: 0018:ffffc90000007b10 EFLAGS: 00000202 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1446e6a RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85b1d6d2 RBP: ffff888109128000 R08: 0000000000000001 R09: ffffffff8a1fe7b7 R10: 0000000000000001 R11: 0000000000000001 R12: ffff8881091be440 R13: ffff8881238d0e00 R14: dffffc0000000000 R15: ffff888107dc6e00 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] dummy_timer+0x12f1/0x32a0 drivers/usb/gadget/udc/dummy_hcd.c:1985 call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa10 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1758 __do_softirq+0x1b0/0x944 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x110/0x1a0 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x6a/0x90 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:lock_acquire+0x1d5/0x700 kernel/locking/lockdep.c:5479 Code: 9c da 7e 83 f8 01 0f 85 d8 03 00 00 9c 58 f6 c4 02 0f 85 c3 03 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000007f3f0 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff9200000fe80 RCX: 0000000000000001 RDX: 1ffff11020050800 RSI: 0000000000000008 RDI: ffffffff8a547d00 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8a1fe777 R10: fffffbfff143fcee R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff87fbb5c8 R14: 0000000000000000 R15: 0000000000000000 __mutex_lock_common kernel/locking/mutex.c:949 [inline] __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1096 driver_deferred_probe_del+0x28/0x350 drivers/base/dd.c:139 driver_bound+0x109/0x300 drivers/base/dd.c:382 really_probe+0x40b/0xe60 drivers/base/dd.c:606 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:745 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbdb/0x1db0 drivers/base/core.c:3242 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556 hub_port_connect drivers/usb/core/hub.c:5276 [inline] hub_port_connect_change drivers/usb/core/hub.c:5416 [inline] port_event drivers/usb/core/hub.c:5562 [inline] hub_event+0x2357/0x4320 drivers/usb/core/hub.c:5644 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: usb_submit_urb failed: -19 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: usb_submit_urb failed: -19