INFO: task kworker/1:3:4710 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:3 D25192 4710 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:697 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:692 usb_start_wait_urb+0x252/0x4c0 drivers/usb/core/message.c:63 isofs_fill_super: bread failed, dev=loop4, iso_blknum=56, block=112 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 usb_get_descriptor+0xc5/0x1b0 drivers/usb/core/message.c:654 usb_get_device_descriptor+0x81/0xf0 drivers/usb/core/message.c:926 hub_port_init+0x74b/0x3120 drivers/usb/core/hub.c:4799 hub_port_connect drivers/usb/core/hub.c:5070 [inline] hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] port_event drivers/usb/core/hub.c:5361 [inline] hub_event+0x1ccd/0x44a0 drivers/usb/core/hub.c:5441 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 isofs_fill_super: bread failed, dev=loop4, iso_blknum=56, block=112 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000008929805e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 5 locks held by kworker/1:3/4710: #0: 000000006c0a95d3 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000934d9a96 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 isofs_fill_super: bread failed, dev=loop4, iso_blknum=56, block=112 #2: 000000001de0f6f1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 000000001de0f6f1 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 #3: 0000000076cb85d9 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 0000000076cb85d9 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 0000000076cb85d9 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 0000000076cb85d9 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 0000000076cb85d9 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 000000005d189918 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 1 lock held by in:imklog/7810: #0: 00000000d78ca565 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/7869: #0: 0000000081f8a2e0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000587d79da (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 2 locks held by kworker/u4:7/9569: 2 locks held by syz-executor.2/25358: isofs_fill_super: bread failed, dev=loop4, iso_blknum=56, block=112 1 lock held by syz-executor.4/25385: 2 locks held by syz-executor.0/25391: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4677 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_hardirqs_off+0x55/0x2c0 kernel/locking/lockdep.c:2895 Code: 8b 1c 25 c0 df 01 00 38 d0 7c 08 84 d2 0f 85 02 02 00 00 8b 3d fc 94 fa 08 85 ff 0f 84 97 01 00 00 65 4c 8b 24 25 c0 df 01 00 <49> 8d bc 24 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 RSP: 0018:ffff8880a1887970 EFLAGS: 00000002 RAX: 0000000000000003 RBX: ffff8880a18781c0 RCX: 1ffffffff148be2c RDX: 0000000000000004 RSI: ffffffff8167adc4 RDI: 0000000000000001 RBP: ffffffff881950cc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000009 R12: ffff8880a18781c0 R13: ffff8881aa700000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f70c8ee38c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f70c5e3e010 CR3: 00000000a1916000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x5c/0xe0 kernel/locking/spinlock.c:184 __debug_check_no_obj_freed lib/debugobjects.c:798 [inline] debug_check_no_obj_freed+0x201/0x490 lib/debugobjects.c:817 free_pages_prepare mm/page_alloc.c:1056 [inline] __free_pages_ok+0x22d/0xd30 mm/page_alloc.c:1279 slab_destroy mm/slab.c:1713 [inline] slabs_destroy+0x90/0xd0 mm/slab.c:1729 __cache_free_alien mm/slab.c:821 [inline] cache_free_alien mm/slab.c:837 [inline] ___cache_free+0x20a/0x3a0 mm/slab.c:3525 qlink_free mm/kasan/quarantine.c:147 [inline] qlist_free_all+0x79/0x140 mm/kasan/quarantine.c:166 quarantine_reduce+0x1a9/0x230 mm/kasan/quarantine.c:259 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x110/0x370 mm/slab.c:3557 getname_flags+0xce/0x590 fs/namei.c:140 getname fs/namei.c:211 [inline] user_path_create fs/namei.c:3696 [inline] do_mkdirat+0x8d/0x2d0 fs/namei.c:3834 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f70c819e687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe621738d8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffe621767f0 RCX: 00007f70c819e687 RDX: 00007f70c8c0fa00 RSI: 00000000000001ed RDI: 000055dd294828a0 RBP: 00007ffe62173910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe621767f0 R15: 00007ffe62173e00 ---------------- Code disassembly (best guess): 0: 8b 1c 25 c0 df 01 00 mov 0x1dfc0,%ebx 7: 38 d0 cmp %dl,%al 9: 7c 08 jl 0x13 b: 84 d2 test %dl,%dl d: 0f 85 02 02 00 00 jne 0x215 13: 8b 3d fc 94 fa 08 mov 0x8fa94fc(%rip),%edi # 0x8fa9515 19: 85 ff test %edi,%edi 1b: 0f 84 97 01 00 00 je 0x1b8 21: 65 4c 8b 24 25 c0 df mov %gs:0x1dfc0,%r12 28: 01 00 * 2a: 49 8d bc 24 84 08 00 lea 0x884(%r12),%rdi <-- trapping instruction 31: 00 32: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 39: fc ff df 3c: 48 89 fa mov %rdi,%rdx 3f: 48 rex.W