INFO: task kworker/u8:7:1070 blocked for more than 143 seconds. Not tainted 6.12.0-rc1-syzkaller-00280-g489cee4caeba #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:7 state:D stack:22320 pid:1070 tgid:1070 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578 rdma_dev_exit_net+0x8e/0x350 drivers/infiniband/core/device.c:1129 ops_exit_list net/core/net_namespace.c:173 [inline] cleanup_net+0x802/0xcc0 net/core/net_namespace.c:632 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 3 locks held by kworker/1:0/25: 1 lock held by khungtaskd/30: #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 3 locks held by kworker/1:2/937: 4 locks held by kworker/u8:7/1070: #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc900040b7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc900040b7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:586 #3: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_exit_net+0x8e/0x350 drivers/infiniband/core/device.c:1129 2 locks held by getty/4988: #0: ffff8880323fa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 4 locks held by kworker/1:4/5283: 3 locks held by kworker/1:5/5284: 3 locks held by kworker/1:6/5312: 3 locks held by kworker/1:7/5315: 5 locks held by syz.4.5/5350: #0: ffffffff9a78a398 (&rdma_nl_types[idx].sem){.+.+}-{3:3}, at: rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:164 [inline] #0: ffffffff9a78a398 (&rdma_nl_types[idx].sem){.+.+}-{3:3}, at: rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] #0: ffffffff9a78a398 (&rdma_nl_types[idx].sem){.+.+}-{3:3}, at: rdma_nl_rcv+0x32d/0x9e0 drivers/infiniband/core/netlink.c:259 #1: ffffffff8fa4e010 (link_ops_rwsem){++++}-{3:3}, at: nldev_newlink+0x42a/0x640 drivers/infiniband/core/nldev.c:1785 #2: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: enable_device_and_get+0x12e/0x440 drivers/infiniband/core/device.c:1328 #3: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: add_compat_devs drivers/infiniband/core/device.c:1031 [inline] #3: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: enable_device_and_get+0x2cd/0x440 drivers/infiniband/core/device.c:1344 #4: ffff8880723d8f38 (&device->compat_devs_mutex){+.+.}-{3:3}, at: add_one_compat_dev+0x10d/0x710 drivers/infiniband/core/device.c:949 1 lock held by syz.0.16/5372: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: netdev_wait_allrefs_any net/core/dev.c:10686 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x89e/0x1000 net/core/dev.c:10797 1 lock held by syz.1.19/5384: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: netdev_wait_allrefs_any net/core/dev.c:10678 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x7b2/0x1000 net/core/dev.c:10797 1 lock held by syz.3.21/5393: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517 1 lock held by syz.2.22/5400: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: netdev_wait_allrefs_any net/core/dev.c:10678 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x7b2/0x1000 net/core/dev.c:10797 3 locks held by syz-executor/5409: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x198/0x280 drivers/infiniband/core/device.c:1185 #2: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x1e6/0x280 drivers/infiniband/core/device.c:1190 2 locks held by syz-executor/5412: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: setup_net+0x602/0x9e0 net/core/net_namespace.c:384 5 locks held by syz-executor/5415: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x198/0x280 drivers/infiniband/core/device.c:1185 #2: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x1e6/0x280 drivers/infiniband/core/device.c:1190 #3: ffff8880723d8f38 (&device->compat_devs_mutex){+.+.}-{3:3}, at: add_one_compat_dev+0x10d/0x710 drivers/infiniband/core/device.c:949 #4: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: ib_get_eth_speed+0x153/0x800 drivers/infiniband/core/verbs.c:1995 2 locks held by syz-executor/5418: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: setup_net+0x602/0x9e0 net/core/net_namespace.c:384 1 lock held by syz-executor/5451: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6717 1 lock held by syz-executor/5456: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6717 1 lock held by syz-executor/5459: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6717 1 lock held by syz-executor/5462: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6717 1 lock held by syz-executor/5465: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6717 3 locks held by syz-executor/5484: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x198/0x280 drivers/infiniband/core/device.c:1185 #2: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x1e6/0x280 drivers/infiniband/core/device.c:1190 3 locks held by syz-executor/5486: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x198/0x280 drivers/infiniband/core/device.c:1185 #2: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x1e6/0x280 drivers/infiniband/core/device.c:1190 1 lock held by syz-executor/5487: #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6717 3 locks held by syz-executor/5491: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x198/0x280 drivers/infiniband/core/device.c:1185 #2: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x1e6/0x280 drivers/infiniband/core/device.c:1190 3 locks held by syz-executor/5494: #0: ffffffff8fcc4f90 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:496 #1: ffffffff8fa40c30 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x198/0x280 drivers/infiniband/core/device.c:1185 #2: ffffffff8fa40df0 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x1e6/0x280 drivers/infiniband/core/device.c:1190 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc1-syzkaller-00280-g489cee4caeba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5283 Comm: kworker/1:4 Not tainted 6.12.0-rc1-syzkaller-00280-g489cee4caeba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline] RIP: 0010:lockdep_hardirqs_on_prepare+0xee/0x780 kernel/locking/lockdep.c:4387 Code: 03 0f b6 04 10 84 c0 0f 85 33 05 00 00 83 3d 78 c0 cc 18 00 0f 85 a8 00 00 00 4c 8d 74 24 40 4c 89 f3 48 c1 eb 03 80 3c 13 00 <74> 12 4c 89 f7 e8 f8 84 8e 00 48 ba 00 00 00 00 00 fc ff df 48 c7 RSP: 0018:ffffc90000a18ac0 EFLAGS: 00000046 RAX: 0000000000000004 RBX: 1ffff92000143160 RCX: ffffffff9a3cc903 RDX: dffffc0000000000 RSI: ffffffff8c60f840 RDI: ffffffff8c60f800 RBP: ffffc90000a18b68 R08: ffffffff901ce9af R09: 1ffffffff2039d35 R10: dffffc0000000000 R11: fffffbfff2039d36 R12: dffffc0000000000 R13: 1ffff92000143178 R14: ffffc90000a18b00 R15: 1ffff9200014315c FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555e294808 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61 __local_bh_enable_ip+0x168/0x200 kernel/softirq.c:387 dst_destroy+0x138/0x460 net/core/dst.c:116 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244