INFO: task kworker/1:5:5530 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:5 state:D stack:19512 pid: 5530 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x947/0x22b0 kernel/sched/core.c:6287 schedule+0xcf/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 virtio_cleanup+0x80/0xa0 drivers/char/hw_random/virtio-rng.c:85 cleanup_rng drivers/char/hw_random/core.c:81 [inline] kref_put include/linux/kref.h:65 [inline] drop_current_rng+0xda/0x110 drivers/char/hw_random/core.c:109 set_current_rng+0x2d3/0x490 drivers/char/hw_random/core.c:96 hwrng_register+0x3bf/0x600 drivers/char/hw_random/core.c:499 chaoskey_probe+0x886/0xc50 drivers/usb/misc/chaoskey.c:205 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x245/0xcc0 drivers/base/dd.c:596 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x228/0x4a0 drivers/base/dd.c:969 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xc35/0x21b0 drivers/base/core.c:3359 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x245/0xcc0 drivers/base/dd.c:596 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x228/0x4a0 drivers/base/dd.c:969 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xc35/0x21b0 drivers/base/core.c:3359 usb_new_device.cold+0x63f/0x108e drivers/usb/core/hub.c:2563 hub_port_connect drivers/usb/core/hub.c:5348 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x9bf/0x1620 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: ffffffff87681ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/2809: 6 locks held by kworker/1:5/5530: #0: ffff888103585938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888103585938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888103585938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888103585938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888103585938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888103585938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8a3/0x1620 kernel/workqueue.c:2268 #1: ffffc90002357db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x1620 kernel/workqueue.c:2272 #2: ffff88810cc7d220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff88810cc7d220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff88811a7ec220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #3: ffff88811a7ec220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:944 #4: ffff88814bebb1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff88814bebb1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:944 #5: ffffffff87a717a8 (rng_mutex){+.+.}-{3:3}, at: hwrng_register+0x7a/0x600 drivers/char/hw_random/core.c:472 2 locks held by agetty/20222: #0: ffff8881202a4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90001ffb2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 1 lock held by syz-executor.2/12658: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_release+0x83/0x2b0 drivers/usb/misc/chaoskey.c:290 1 lock held by syz-executor.2/12662: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_read+0x251/0x5b0 drivers/usb/misc/chaoskey.c:435 1 lock held by syz-executor.0/12659: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_release+0x83/0x2b0 drivers/usb/misc/chaoskey.c:290 1 lock held by syz-executor.0/12664: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_read+0x251/0x5b0 drivers/usb/misc/chaoskey.c:435 1 lock held by syz-executor.1/12661: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_release+0x83/0x2b0 drivers/usb/misc/chaoskey.c:290 1 lock held by syz-executor.1/12665: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_read+0x251/0x5b0 drivers/usb/misc/chaoskey.c:435 1 lock held by syz-executor.1/12670: #0: ffffffff87f7e9b0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 1 lock held by syz-executor.3/12667: #0: ffff88810a55a078 (&dev->lock#3){+.+.}-{3:3}, at: chaoskey_release+0x83/0x2b0 drivers/usb/misc/chaoskey.c:290 3 locks held by syz-executor.5/12678: 3 locks held by syz-executor.5/12679: #0: ffff888113813270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffff88810e90e438 (sb_writers#4){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:647 #2: ffff888146e1f9b0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline] #2: ffff888146e1f9b0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x500 fs/ext4/file.c:263 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x49/0x148 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1d5/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc0f/0xf20 kernel/hung_task.c:295 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12694 Comm: syz-executor.3 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:981 [inline] RIP: 0010:debug_check_no_obj_freed+0x1d8/0x420 lib/debugobjects.c:1023 Code: 02 00 00 48 89 45 08 4d 89 30 4c 89 c7 4d 89 68 08 e8 8c d1 ff ff 48 85 ed 74 2c 49 89 e8 4c 89 c0 48 c1 e8 03 42 80 3c 38 00 <0f> 84 2e ff ff ff 4c 89 c7 4c 89 44 24 38 e8 85 57 6d ff 4c 8b 44 RSP: 0018:ffffc900037e7d68 EFLAGS: 00000046 RAX: 1ffff11028ab5b88 RBX: ffff888117be1100 RCX: ffffffff8128e770 RDX: 1ffffffff1560fe2 RSI: 0000000000000004 RDI: ffff88811eb37440 RBP: ffff8881455adc40 R08: ffff8881455adc40 R09: ffffea0004595d08 R10: fffff520006fcf9b R11: 000000000000003f R12: 0000000000000002 R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000 FS: 000055555561e400(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f50d754b000 CR3: 000000011b57e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: slab_free_hook mm/slub.c:1675 [inline] slab_free_freelist_hook mm/slub.c:1725 [inline] slab_free mm/slub.c:3483 [inline] kmem_cache_free+0x268/0x4e0 mm/slub.c:3499 putname fs/namei.c:270 [inline] putname+0xfe/0x140 fs/namei.c:256 do_symlinkat+0x190/0x2e0 fs/namei.c:4288 __do_sys_symlink fs/namei.c:4301 [inline] __se_sys_symlink fs/namei.c:4299 [inline] __x64_sys_symlink+0x75/0x90 fs/namei.c:4299 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe5c45191e7 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe99936fa8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe5c45191e7 RDX: 00007ffe99937083 RSI: 00007fe5c4573d5e RDI: 00007ffe99937070 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe99936e40 R10: 00007ffe99936cf7 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe99937070 ---------------- Code disassembly (best guess): 0: 02 00 add (%rax),%al 2: 00 48 89 add %cl,-0x77(%rax) 5: 45 08 4d 89 or %r9b,-0x77(%r13) 9: 30 4c 89 c7 xor %cl,-0x39(%rcx,%rcx,4) d: 4d 89 68 08 mov %r13,0x8(%r8) 11: e8 8c d1 ff ff callq 0xffffd1a2 16: 48 85 ed test %rbp,%rbp 19: 74 2c je 0x47 1b: 49 89 e8 mov %rbp,%r8 1e: 4c 89 c0 mov %r8,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) * 2a: 0f 84 2e ff ff ff je 0xffffff5e <-- trapping instruction 30: 4c 89 c7 mov %r8,%rdi 33: 4c 89 44 24 38 mov %r8,0x38(%rsp) 38: e8 85 57 6d ff callq 0xff6d57c2 3d: 4c rex.WR 3e: 8b .byte 0x8b 3f: 44 rex.R