INFO: task kworker/u8:8:2574 blocked for more than 143 seconds. Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:8 state:D stack:23728 pid:2574 tgid:2574 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 devl_lock net/devlink/core.c:276 [inline] devl_dev_lock net/devlink/devl_internal.h:109 [inline] devlink_pernet_pre_exit+0x137/0x2b0 net/devlink/core.c:506 ops_pre_exit_list net/core/net_namespace.c:163 [inline] cleanup_net+0x488/0xbf0 net/core/net_namespace.c:620 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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: 2 locks held by kworker/1:0/25: 1 lock held by khungtaskd/30: #0: ffffffff8ddb5ce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8ddb5ce0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8ddb5ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626 3 locks held by kworker/1:2/53: 5 locks held by kworker/u8:8/2574: #0: ffff8880166e3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc90009577d80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffffffff8fa0c6d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xbb/0xbf0 net/core/net_namespace.c:594 #3: ffff8880303ca0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #3: ffff8880303ca0e8 (&dev->mutex){....}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline] #3: ffff8880303ca0e8 (&dev->mutex){....}-{3:3}, at: devlink_pernet_pre_exit+0x12d/0x2b0 net/devlink/core.c:506 #4: ffff8880303c8250 (&devlink->lock_key#8){+.+.}-{3:3}, at: devl_lock net/devlink/core.c:276 [inline] #4: ffff8880303c8250 (&devlink->lock_key#8){+.+.}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline] #4: ffff8880303c8250 (&devlink->lock_key#8){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x137/0x2b0 net/devlink/core.c:506 2 locks held by getty/4976: #0: ffff88802fd990a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 5 locks held by kworker/1:3/5271: 2 locks held by kworker/1:4/5272: 4 locks held by kworker/1:5/5294: 3 locks held by kworker/1:6/5303: 3 locks held by kworker/u8:16/6257: 3 locks held by kworker/u8:20/6270: #0: ffff888015889148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc900041e7d80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:276 5 locks held by syz-executor/8052: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88807cd07888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 #4: ffff8880303ca0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff8880303ca0e8 (&dev->mutex){....}-{3:3}, at: device_del+0xa1/0x9f0 drivers/base/core.c:3833 4 locks held by syz-executor/8054: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88802b4a2088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8057: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88805f2b3488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8059: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88802222ec88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8092: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff888058fc5c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8100: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88807c36a888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8103: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88807bd24888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8106: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff88807b2a2488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8108: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff888024408888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/8139: #0: ffff88803033c420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #1: ffff888023431c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325 #2: ffff88802346e1e8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326 #3: ffffffff8efba228 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216 1 lock held by syz-executor/8152: #0: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6644 2 locks held by syz-executor/8154: #0: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6644 #1: ffffffff8ddc1478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:296 1 lock held by syz-executor/8158: #0: ffffffff8ddc1478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:328 1 lock held by syz-executor/8160: #0: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fa21e28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6644 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf4e/0x1280 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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: 5271 Comm: kworker/1:3 Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: events kfree_rcu_monitor RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline] RIP: 0010:unwind_next_frame+0xd9b/0x23a0 arch/x86/kernel/unwind_orc.c:585 Code: 4d 00 e8 88 b4 c3 ff e9 cd f6 ff ff e8 be 8f 4d 00 49 8d 45 f8 ba 08 00 00 00 48 89 df 48 89 c6 48 89 44 24 28 e8 e5 ef ff ff <31> ff 41 89 c7 89 c6 e8 79 91 4d 00 48 8d 4b 34 45 84 ff 0f 84 37 RSP: 0018:ffffc90000a17fe0 EFLAGS: 00000082 RAX: 0000000000000001 RBX: ffffc90000a180b8 RCX: ffffffff813cdd16 RDX: ffff8880604c1e00 RSI: ffffffff813cdd79 RDI: 0000000000000005 RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: ffffffff90a1ecca R13: ffffc90000a18158 R14: ffffffff90a1ecce R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555564635588 CR3: 000000000db7c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unwind_start+0x5aa/0x880 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xb2/0x170 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:681 [inline] dummy_urb_enqueue+0x8d/0x8a0 drivers/usb/gadget/udc/dummy_hcd.c:1271 usb_hcd_submit_urb+0x2d1/0x2090 drivers/usb/core/hcd.c:1533 usb_submit_urb+0x87c/0x1730 drivers/usb/core/urb.c:581 ath9k_hif_usb_reg_in_cb+0x494/0x690 drivers/net/wireless/ath/ath9k/hif_usb.c:792 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x17c3/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1987 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:ieee80211_scan_rx+0x286/0xac0 net/mac80211/scan.c:296 Code: b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 1a 05 00 00 41 8b 45 0c 31 ff 83 e0 01 41 89 c7 89 c6 89 44 24 18 75 4e 0d f7 45 85 ff 0f 85 16 02 00 00 e8 27 4c 0d f7 4c 89 e2 RSP: 0018:ffffc90000a18be0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88807b064500 RCX: ffffffff8a5b8a0f RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88805af80e40 R08: 0000000000000004 R09: 000000000024cde0 R10: 000000000024cde0 R11: 0000000000000000 R12: ffff88807c4e8950 R13: ffff88805af83338 R14: ffff88807b064570 R15: 0000000000000000 __ieee80211_rx_handle_packet net/mac80211/rx.c:5225 [inline] ieee80211_rx_list+0x1be3/0x2e90 net/mac80211/rx.c:5462 ieee80211_rx_napi+0xdd/0x400 net/mac80211/rx.c:5485 ieee80211_rx include/net/mac80211.h:5124 [inline] ieee80211_handle_queued_frames+0xd5/0x130 net/mac80211/main.c:439 tasklet_action_common.constprop.0+0x24c/0x3e0 kernel/softirq.c:785 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 06 a2 53 f6 48 89 df e8 1e 1f 54 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 b5 92 45 f6 65 8b 05 f6 13 ef 74 85 c0 74 16 5b RSP: 0018:ffffc90003faf938 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff95103eb8 RCX: 1ffffffff28c95ce RDX: 0000000000000000 RSI: ffffffff8b4cc500 RDI: ffffffff8bb08ec0 RBP: 0000000000000282 R08: 0000000000000001 R09: fffffbfff28c5ae1 R10: ffffffff9462d70f R11: 0000000000000000 R12: ffff88802583c100 R13: 000000000000000c R14: 000000000000000c R15: ffff88802583c100 __debug_check_no_obj_freed lib/debugobjects.c:999 [inline] debug_check_no_obj_freed+0x328/0x600 lib/debugobjects.c:1020 slab_free_hook mm/slub.c:2219 [inline] slab_free_freelist_hook mm/slub.c:2281 [inline] slab_free_bulk mm/slub.c:4497 [inline] kmem_cache_free_bulk.part.0+0x19c/0x390 mm/slub.c:4714 kfree_bulk include/linux/slab.h:570 [inline] kvfree_rcu_bulk+0x454/0x550 kernel/rcu/tree.c:3405 kvfree_rcu_drain_ready kernel/rcu/tree.c:3579 [inline] kfree_rcu_monitor+0x47b/0x12d0 kernel/rcu/tree.c:3597 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244