INFO: task syz-executor.0:5545 blocked for more than 143 seconds. Not tainted 6.11.0-rc7-next-20240912-syzkaller-g57f962b956f1-dirty #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27616 pid:5545 tgid:5543 ppid:5519 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6674 __schedule_loop kernel/sched/core.c:6751 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6766 blk_mq_freeze_queue_wait+0xff/0x190 block/blk-mq.c:139 nbd_set_size+0xe7/0x8a0 drivers/block/nbd.c:387 nbd_start_device_ioctl drivers/block/nbd.c:1464 [inline] __nbd_ioctl drivers/block/nbd.c:1539 [inline] nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1579 blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f03a0e79829 RSP: 002b:00007f03a1f650c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f03a0f8c030 RCX: 00007f03a0e79829 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 00007f03a0ed5074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f03a0f8c030 R15: 00007ffe63b89098 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937f60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937f60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937f60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 2 locks held by getty/4972: #0: ffff88814b8850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by syz-executor.0/5545: #0: ffff888020112998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x13c/0xf40 drivers/block/nbd.c:1572 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc7-next-20240912-syzkaller-g57f962b956f1-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 51 Comm: kworker/u8:3 Not tainted 6.11.0-rc7-next-20240912-syzkaller-g57f962b956f1-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:insn_get_displacement+0x44/0x9a0 arch/x86/lib/insn.c:481 Code: 00 00 fc ff df e8 2c 44 d4 f5 49 8d 5d 34 49 89 de 49 c1 ee 03 43 0f b6 04 26 84 c0 0f 85 ee 06 00 00 0f b6 2b 45 31 ff 31 ff <89> ee e8 05 47 d4 f5 85 ed 74 0a e8 fc 43 d4 f5 e9 83 06 00 00 48 RSP: 0018:ffffc90000bc77b0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90000bc7954 RCX: ffff888015fc8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff8bc0adcc R09: 0000000000000000 R10: ffffc90000bc7920 R11: fffff52000178f2f R12: dffffc0000000000 R13: ffffc90000bc7920 R14: 1ffff92000178f2a R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005580466a0600 CR3: 000000000e734000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: insn_get_immediate+0x62/0x11f0 arch/x86/lib/insn.c:650 insn_get_length arch/x86/lib/insn.c:723 [inline] insn_decode+0x2d6/0x4c0 arch/x86/lib/insn.c:762 arch_jump_entry_size arch/x86/kernel/jump_label.c:24 [inline] __jump_label_patch+0xe8/0x490 arch/x86/kernel/jump_label.c:45 arch_jump_label_transform_queue+0x68/0x100 arch/x86/kernel/jump_label.c:137 __jump_label_update+0x177/0x3a0 kernel/jump_label.c:513 static_key_disable_cpuslocked+0xd2/0x1c0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1bf/0x260 mm/kfence/core.c:854 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x86d/0xd10 kernel/workqueue.c:3387 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244