syzbot

INFO: task syz-executor165:5062 blocked for more than 143 seconds.
      Not tainted 6.6.0-rc5-syzkaller-00072-g401644852d0b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor165 state:D stack:23688 pid:5062  ppid:5060   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x196c/0x4af0 kernel/sched/core.c:6695
 schedule+0xc3/0x180 kernel/sched/core.c:6771
 schedule_timeout+0xb0/0x300 kernel/time/timer.c:2143
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x354/0x620 kernel/sched/completion.c:148
 __flush_work+0x950/0xac0 kernel/workqueue.c:3407
 nilfs_segctor_destroy fs/nilfs2/segment.c:2766 [inline]
 nilfs_detach_log_writer+0x47d/0xbe0 fs/nilfs2/segment.c:2850
 nilfs_put_super+0x4d/0x160 fs/nilfs2/super.c:499
 generic_shutdown_super+0x13a/0x2c0 fs/super.c:693
 kill_block_super+0x41/0x70 fs/super.c:1646
 deactivate_locked_super+0xa4/0x110 fs/super.c:481
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7374f1d347
RSP: 002b:00007ffdeb269508 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7374f1d347
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffdeb2695c0
RBP: 00007ffdeb2695c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffdeb26a620
R13: 0000555556b436c0 R14: 0000000000000033 R15: 431bde82d7b634db
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 #0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline]
 #0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
2 locks held by getty/4790:
 #0: ffff88802685d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015b72f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2206
1 lock held by syz-executor165/5062:
 #0: ffff88807bb720e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807bb720e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807bb720e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:513
3 locks held by kworker/0:0/5102:
 #0: ffff888012870d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #0: ffff888012870d38 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703
 #1: ffffc90003fbfd20 ((work_completion)(&sci->sc_iput_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
 #1: ffffc90003fbfd20 ((work_completion)(&sci->sc_iput_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703
 #2: ffff88807bb72600 (sb_internal#2){.+.+}-{0:0}, at: nilfs_evict_inode+0x167/0x500 fs/nilfs2/inode.c:929

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc5-syzkaller-00072-g401644852d0b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfa9/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 48 Comm: kworker/u4:3 Not tainted 6.6.0-rc5-syzkaller-00072-g401644852d0b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__text_gen_insn arch/x86/include/asm/text-patching.h:117 [inline]
RIP: 0010:text_gen_insn arch/x86/include/asm/text-patching.h:135 [inline]
RIP: 0010:__jump_label_patch+0x15c/0x480 arch/x86/kernel/jump_label.c:53
Code: 5c 00 4d 01 f5 44 89 ff 48 c7 c6 00 25 16 8d e8 2a d2 5c 00 41 80 ff 05 75 6d e8 5f cd 5c 00 48 c7 c3 80 29 0c 90 4c 8b 34 24 <48> 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 13 02 00 00 c6 03
RSP: 0018:ffffc90000b8f920 EFLAGS: 00000293
RAX: ffffffff81313da1 RBX: ffffffff900c2980 RCX: ffff888014eb5940
RDX: 0000000000000000 RSI: ffffffff8d162500 RDI: 0000000000000005
RBP: ffffc90000b8fa50 R08: 0000000000000001 R09: ffffffff81313d96
R10: 0000000000000002 R11: ffff888014eb5940 R12: dffffc0000000000
R13: ffffffff81e7a645 R14: ffffffff81e7a415 R15: 0000000000000005
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557dc8c21780 CR3: 000000000d130000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_jump_label_transform_queue+0x64/0xf0 arch/x86/kernel/jump_label.c:137
 __jump_label_update+0x177/0x3a0 kernel/jump_label.c:475
 static_key_disable_cpuslocked+0xce/0x1b0 kernel/jump_label.c:235
 static_key_disable+0x1a/0x20 kernel/jump_label.c:243
 toggle_allocation_gate+0x1b8/0x250 mm/kfence/core.c:835
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.337 msecs