INFO: task syz-executor104:5159 blocked for more than 143 seconds. Not tainted 6.9.0-rc3-next-20240408-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor104 state:D stack:26288 pid:5159 tgid:5158 ppid:5113 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x17e8/0x4a50 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 bdev_release+0x1c8/0x720 block/bdev.c:1050 blkdev_release+0x15/0x20 block/fops.c:628 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 get_signal+0x15e6/0x1740 kernel/signal.c:2683 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f04f4a16479 RSP: 002b:00007f04f49ce228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f04f4a9d328 RCX: 00007f04f4a16479 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007f04f4a9d320 R08: 00007f04f49ce6c0 R09: 00007f04f49ce6c0 R10: 00007f04f49ce6c0 R11: 0000000000000246 R12: 00007f04f4a9d32c R13: 00007f04f4a6a1a4 R14: 64626e2f7665642f R15: 00007ffc15655f78 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e3359e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e3359e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e3359e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4836: #0: ffff88802ecf10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 1 lock held by udevd/5114: #0: ffff8880201ea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xdd/0xcb0 block/bdev.c:868 1 lock held by syz-executor104/5159: #0: ffff8880201ea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x1c8/0x720 block/bdev.c:1050 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc3-next-20240408-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 61 Comm: kworker/u8:4 Not tainted 6.9.0-rc3-next-20240408-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:switch_ldt+0x8b/0x280 arch/x86/kernel/ldt.c:109 Code: f3 4b 89 04 3c e8 85 6a 62 00 48 81 c3 b8 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 38 40 c7 00 4c 8b 2b <49> 8d 9e b8 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 RSP: 0018:ffffc900015c75a0 EFLAGS: 00000046 RAX: 1ffff11002a0e0d7 RBX: ffff8880150706b8 RCX: ffff888018701e00 RDX: 0000000000000000 RSI: ffffffff8e42e000 RDI: ffff888015070000 RBP: ffffc900015c7630 R08: ffffffff8e42e77b R09: 1ffffffff1c85cef R10: dffffc0000000000 R11: fffffbfff1c85cf0 R12: 1ffff920002b8eb4 R13: 0000000000000000 R14: ffffffff8e42e000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff278602580 CR3: 000000000e134000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: switch_mm_irqs_off+0x84d/0xae0 arch/x86/mm/tlb.c:658 unuse_temporary_mm arch/x86/kernel/alternative.c:1832 [inline] __text_poke+0x8f0/0xd30 arch/x86/kernel/alternative.c:1942 text_poke arch/x86/kernel/alternative.c:1985 [inline] text_poke_bp_batch+0x59c/0xb30 arch/x86/kernel/alternative.c:2318 text_poke_flush arch/x86/kernel/alternative.c:2487 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2494 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826 process_one_work kernel/workqueue.c:3218 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299 worker_thread+0x86d/0xd70 kernel/workqueue.c:3380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.306 msecs