INFO: task kworker/u4:3:46 blocked for more than 143 seconds. Not tainted 6.1.0-syzkaller-13052-ged56954cf5a8 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:3 state:D stack:25336 pid:46 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0xb8a/0x5450 kernel/sched/core.c:6555 schedule+0xde/0x1b0 kernel/sched/core.c:6631 rxrpc_destroy_all_calls+0x1ee/0x640 net/rxrpc/call_object.c:733 rxrpc_exit_net+0x15c/0x300 net/rxrpc/net_ns.c:125 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c590b70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c590870 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8c5916c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x57/0x264 kernel/locking/lockdep.c:6494 3 locks held by kworker/u4:3/46: #0: ffff8880121cf938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880121cf938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880121cf938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff8880121cf938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff8880121cf938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff8880121cf938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260 #1: ffffc90000b77da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264 #2: ffffffff8dea6390 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9f/0xb10 net/core/net_namespace.c:568 2 locks held by getty/4746: #0: ffff88814bd20098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177 1 lock held by syz-executor.4/5092: #0: ffff8880b9a3b598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:545 [inline] #0: ffff8880b9a3b598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x90/0x120 kernel/sched/core.c:530 2 locks held by kworker/u4:11/6369: 3 locks held by syz-executor.2/15095: 1 lock held by syz-executor.0/17600: 1 lock held by syz-executor.4/17610: #0: ffff8880b9a3b598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:545 [inline] #0: ffff8880b9a3b598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x90/0x120 kernel/sched/core.c:530 1 lock held by syz-executor.5/17607: #0: ffff8880b9a3b598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:545 [inline] #0: ffff8880b9a3b598 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x90/0x120 kernel/sched/core.c:530 3 locks held by syz-executor.5/17608: #0: ffffffff8dea6390 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f8/0x6b0 net/core/net_namespace.c:479 #1: ffffffff8deba028 (rtnl_mutex){+.+.}-{3:3}, at: register_netdev+0x15/0x50 net/core/dev.c:10171 #2: ffff8880521c0350 (&rxnet->local_mutex){+.+.}-{3:3}, at: rxrpc_lookup_local+0x161/0xfb0 net/rxrpc/local_object.c:219 1 lock held by syz-executor.4/17615: #0: ffff88801bbe4758 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88801bbe4758 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x159/0x280 mm/util.c:518 2 locks held by syz-executor.4/17616: 3 locks held by syz-executor.3/17626: 3 locks held by syz-executor.5/17630: 4 locks held by syz-executor.1/17631: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-syzkaller-13052-ged56954cf5a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x333/0x3c0 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+0xc75/0xfc0 kernel/hung_task.c:377 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.0-syzkaller-13052-ged56954cf5a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:_compound_head include/linux/page-flags.h:253 [inline] RIP: 0010:virt_to_folio include/linux/mm.h:960 [inline] RIP: 0010:virt_to_slab mm/slab.h:185 [inline] RIP: 0010:kmem_cache_free+0x8d/0x5c0 mm/slub.c:3809 Code: 48 89 df 4c 8b 6c 24 60 e8 f0 66 6a ff 48 c1 e8 0c 49 89 c4 48 b8 00 00 00 00 00 ea ff ff 49 c1 e4 06 49 01 c4 49 8b 44 24 08 01 0f 85 41 02 00 00 0f 1f 44 00 00 4c 89 e7 e8 de 73 ff ff 48 RSP: 0018:ffffc900001b7cd8 EFLAGS: 00000282 RAX: ffff888140007a00 RBX: ffff888029c06000 RCX: 0000000000000100 RDX: ffff888012e71d40 RSI: ffffffff81397818 RDI: 0000000000000007 RBP: ffff888140007a00 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffea0000a70180 R13: ffffffff816c6b7f R14: ffffc900001b7db8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31334000 CR3: 000000005c234000 CR4: 0000000000350ee0 Call Trace: rcu_do_batch kernel/rcu/tree.c:2244 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2504 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x659/0xa20 kernel/smpboot.c:164 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308