INFO: task syz-executor.2:4886 blocked for more than 143 seconds.
Not tainted 6.1.81-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:27560 pid:4886 ppid:3590 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_put+0x100/0x750 block/bdev.c:913
blkdev_close+0x56/0x80 block/fops.c:514
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
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:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb6c8c7dda9
RSP: 002b:00007fb6c9a760c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fb6c8dabf80 RCX: 00007fb6c8c7dda9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007fb6c8cca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb6c8dabf80 R15: 00007fff7b49f948
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d12aa10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d12b210 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
#0: ffffffff8d12a840 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:319 [inline]
#0: ffffffff8d12a840 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:760 [inline]
#0: ffffffff8d12a840 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
1 lock held by udevd/3001:
2 locks held by getty/3298:
#0: ffff88814af4b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188
1 lock held by udevd/3598:
#0: ffff8880208334c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:815
3 locks held by kworker/u4:5/3688:
4 locks held by kworker/u4:6/3692:
1 lock held by syz-executor.2/4886:
#0: ffff8880208334c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x750 block/bdev.c:913
2 locks held by syz-executor.4/9220:
3 locks held by syz-executor.1/9240:
4 locks held by syz-executor.0/9241:
#0: ffff888076a2c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffff888055a310b8 (&buf->lock){+.+.}-{3:3}, at: tiocsti+0x1d4/0x2f0 drivers/tty/tty_io.c:2286
#2: ffff888076a2c2e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_receive_buf_common+0x7a/0x1410 drivers/tty/n_tty.c:1674
#3: ffffc90014acd380 (&ldata->output_lock){+.+.}-{3:3}, at: flush_echoes drivers/tty/n_tty.c:815 [inline]
#3: ffffc90014acd380 (&ldata->output_lock){+.+.}-{3:3}, at: __receive_buf drivers/tty/n_tty.c:1615 [inline]
#3: ffffc90014acd380 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_receive_buf_common+0xcc4/0x1410 drivers/tty/n_tty.c:1711
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.81-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
__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+0x1b0/0x3f0 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:307
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3692 Comm: kworker/u4:6 Not tainted 6.1.81-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: netns cleanup_net
RIP: 0010:node_maxindex lib/radix-tree.c:216 [inline]
RIP: 0010:radix_tree_load_root lib/radix-tree.c:395 [inline]
RIP: 0010:__radix_tree_lookup lib/radix-tree.c:756 [inline]
RIP: 0010:radix_tree_delete_item+0x85/0x3e0 lib/radix-tree.c:1418
Code: bf 02 00 00 00 48 89 de e8 e8 9b 07 f7 48 83 fb 02 0f 85 f4 02 00 00 4c 89 ed 48 83 e5 fd 48 89 e8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 88 01 00 00 0f b6 6d 00 bf 40 00 00 00 89 ee e8 33 9a
RSP: 0018:ffffc900052ef660 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff888022439dc0
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: ffff888012906680 R08: ffffffff8a82e708 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff88802864d0a0
R13: ffff888012906682 R14: dffffc0000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e821000 CR3: 000000007da2e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kernfs_put+0x2f2/0x4a0 fs/kernfs/dir.c:560
sysfs_remove_groups+0x50/0xa0 fs/sysfs/group.c:312
device_remove_groups drivers/base/core.c:2733 [inline]
device_remove_attrs+0x1d8/0x290 drivers/base/core.c:2947
device_del+0x6da/0xbd0 drivers/base/core.c:3858
unregister_netdevice_many+0x12c1/0x17a0 net/core/dev.c:10905
sit_exit_batch_net+0x43c/0x480 net/ipv6/sit.c:1887
ops_exit_list net/core/net_namespace.c:174 [inline]
cleanup_net+0x763/0xb60 net/core/net_namespace.c:601
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:307