INFO: task syz-executor964:4246 blocked for more than 143 seconds.
      Not tainted 6.1.127-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor964 state:D stack:26184 pid:4246  ppid:4245   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 io_schedule+0x88/0x100 kernel/sched/core.c:8786
 bit_wait_io+0xe/0xc0 kernel/sched/wait_bit.c:209
 __wait_on_bit+0xa8/0x2e0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x1d0/0x250 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 __wait_on_buffer fs/buffer.c:122 [inline]
 wait_on_buffer include/linux/buffer_head.h:385 [inline]
 __bread_slow fs/buffer.c:1178 [inline]
 __bread_gfp+0x2a8/0x370 fs/buffer.c:1370
 sb_bread include/linux/buffer_head.h:338 [inline]
 befs_fill_super+0x890/0xfb0 fs/befs/linuxvfs.c:854
 mount_bdev+0x2c9/0x3f0 fs/super.c:1443
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
 vfs_get_tree+0x88/0x270 fs/super.c:1573
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3056
 do_mount fs/namespace.c:3399 [inline]
 __do_sys_mount fs/namespace.c:3607 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3584
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fee0a2e18f9
RSP: 002b:00007ffe64cd28e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fee0a2e18f9
RDX: 0000000020000040 RSI: 00000000200004c0 RDI: 0000000020000480
RBP: 00007fee0a3545f0 R08: 0000000000000000 R09: 0000000000000006
R10: 0000000000008205 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d32b290 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d32ba90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
 #0: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
2 locks held by getty/4019:
 #0: ffff88807e028098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
1 lock held by syz-executor964/4246:
 #0: ffff88802fd760e0 (&type->s_umount_key#41/1){+.+.}-{3:3}, at: alloc_super+0x217/0x930 fs/super.c:228

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.127-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1ae/0x3f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf88/0xfd0 kernel/hung_task.c:377
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2896 Comm: kworker/u4:5 Not tainted 6.1.127-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:insn_get_sib arch/x86/lib/insn.c:431 [inline]
RIP: 0010:insn_get_displacement+0x22e/0x970 arch/x86/lib/insn.c:464
Code: 31 f7 4c 3b 23 0f 87 f9 04 00 00 e8 5c 13 da f6 48 8b 54 24 10 48 89 d0 48 c1 e8 03 48 bb 00 00 00 00 00 fc ff df 0f b6 04 18 <84> c0 0f 85 dc 06 00 00 0f b6 12 80 7c 1d 00 00 48 89 dd 74 0c 4c
RSP: 0018:ffffc9000c8b7820 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88802fbcbb80
RDX: ffffffff8b068b6d RSI: 0000000000000004 RDI: 0000000000000004
RBP: 1ffff92001916f3d R08: ffffffff8ab088cd R09: ffffc9000c8b7980
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8b068b6e
R13: ffffc9000c8b7980 R14: ffffc9000c8b79e8 R15: 1ffff92001916f36
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564404d73680 CR3: 000000000d08e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 insn_get_immediate+0x458/0x1390 arch/x86/lib/insn.c:632
 insn_get_length arch/x86/lib/insn.c:707 [inline]
 insn_decode+0x36c/0x500 arch/x86/lib/insn.c:747
 text_poke_loc_init+0xd2/0x680 arch/x86/kernel/alternative.c:1638
 arch_jump_label_transform_queue+0x71/0xd0 arch/x86/kernel/jump_label.c:138
 __jump_label_update+0x177/0x3a0 kernel/jump_label.c:510
 static_key_disable_cpuslocked+0xce/0x1b0 kernel/jump_label.c:237
 static_key_disable+0x16/0x20 kernel/jump_label.c:245
 toggle_allocation_gate+0x3e0/0x480 mm/kfence/core.c:818
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.185 msecs