INFO: task syz-executor410:3654 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc3-syzkaller-00107-g42e66b1cc3a0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor410 state:D stack:24784 pid: 3654 ppid:  3641 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0x957/0xe20 kernel/sched/core.c:6494
 schedule+0xcb/0x190 kernel/sched/core.c:6570
 blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:180
 nbd_add_socket+0x17b/0x8e0 drivers/block/nbd.c:1123
 __nbd_ioctl drivers/block/nbd.c:1464 [inline]
 nbd_ioctl+0x260/0xa40 drivers/block/nbd.c:1521
 blkdev_ioctl+0x3a6/0x760 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd40d640ee9
RSP: 002b:00007fd40d5ee308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd40d6c4408 RCX: 00007fd40d640ee9
RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003
RBP: 00007fd40d6c4400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd40d6c440c
R13: 00007fd40d692074 R14: 64626e2f7665642f R15: 0000000000022000
 </TASK>
INFO: task syz-executor410:3655 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc3-syzkaller-00107-g42e66b1cc3a0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor410 state:D stack:28816 pid: 3655 ppid:  3641 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0x957/0xe20 kernel/sched/core.c:6494
 schedule+0xcb/0x190 kernel/sched/core.c:6570
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6629
 __mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
 nbd_ioctl+0x13e/0xa40 drivers/block/nbd.c:1514
 blkdev_ioctl+0x3a6/0x760 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd40d640ee9
RSP: 002b:00007fd40d5cd308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd40d6c4418 RCX: 00007fd40d640ee9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007fd40d6c4410 R08: 00007fd40d5cd700 R09: 0000000000000000
R10: 00007fd40d5cd700 R11: 0000000000000246 R12: 00007fd40d6c441c
R13: 00007fd40d692074 R14: 64626e2f7665642f R15: 0000000000022000
 </TASK>
INFO: task syz-executor410:3656 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc3-syzkaller-00107-g42e66b1cc3a0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor410 state:D stack:26144 pid: 3656 ppid:  3641 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0x957/0xe20 kernel/sched/core.c:6494
 schedule+0xcb/0x190 kernel/sched/core.c:6570
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6629
 __mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
 nbd_ioctl+0x13e/0xa40 drivers/block/nbd.c:1514
 blkdev_ioctl+0x3a6/0x760 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd40d640ee9
RSP: 002b:00007fd40d5ac308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd40d6c4428 RCX: 00007fd40d640ee9
RDX: 0000000000000040 RSI: 000000000000ab07 RDI: 0000000000000003
RBP: 00007fd40d6c4420 R08: 00007fd40d5ac700 R09: 0000000000000000
R10: 00007fd40d5ac700 R11: 0000000000000246 R12: 00007fd40d6c442c
R13: 00007fd40d692074 R14: 64626e2f7665642f R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cd20a30 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cd21230 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
 #0: ffffffff8cd20860 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3291:
 #0: ffff888027512098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002d232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177
1 lock held by syz-executor410/3654:
 #0: ffff88801e7db198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x13e/0xa40 drivers/block/nbd.c:1514
1 lock held by syz-executor410/3655:
 #0: ffff88801e7db198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x13e/0xa40 drivers/block/nbd.c:1514
1 lock held by syz-executor410/3656:
 #0: ffff88801e7db198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x13e/0xa40 drivers/block/nbd.c:1514

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc3-syzkaller-00107-g42e66b1cc3a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x47c/0x4b0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x169/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xcd5/0xd20 kernel/hung_task.c:369
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 6.0.0-rc3-syzkaller-00107-g42e66b1cc3a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:kasan_check_range+0x201/0x2e0 mm/kasan/generic.c:189
Code: 03 4d 89 cf 49 8d 6e 07 4d 85 f6 49 0f 49 ee 48 83 e5 f8 49 29 ee 74 0f 90 41 80 3f 00 75 78 49 ff c7 49 ff ce 75 f2 5b 41 5e <41> 5f 5d c3 45 84 db 75 67 41 f7 c3 00 ff 00 00 0f 85 a2 00 00 00
RSP: 0018:ffffc900000d74f0 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 0000000000000091 RCX: ffffffff816957fc
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ff9e050
RBP: 000000000001ffff R08: dffffc0000000000 R09: fffffbfff1ff3c0b
R10: fffffbfff1ff3c0b R11: 1ffffffff1ff3c0a R12: 0000000000040000
R13: ffff888012245880 R14: 0000000000040002 R15: ffff8880122463e0
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7ce1249990 CR3: 000000000ca8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class kernel/locking/lockdep.c:227 [inline]
 check_wait_context kernel/locking/lockdep.c:4728 [inline]
 __lock_acquire+0x53c/0x1f60 kernel/locking/lockdep.c:5003
 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 __get_locked_pte+0x169/0x1c0 mm/memory.c:1838
 get_locked_pte include/linux/mm.h:2089 [inline]
 __text_poke+0x272/0x9d0 arch/x86/kernel/alternative.c:1123
 text_poke arch/x86/kernel/alternative.c:1208 [inline]
 text_poke_bp_batch+0x1b7/0x970 arch/x86/kernel/alternative.c:1487
 text_poke_flush arch/x86/kernel/alternative.c:1660 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_disable_cpuslocked+0xc8/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 toggle_allocation_gate+0x3d8/0x470 mm/kfence/core.c:825
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.012 msecs