INFO: task syz.1.8281:15131 blocked for more than 143 seconds. Not tainted 6.10.0-syzkaller-12708-g2f8c4f506285 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.8281 state:D stack:24896 pid:15131 tgid:15130 ppid:14797 flags:0x00024000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2557 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+0x355/0x620 kernel/sched/completion.c:148 io_wq_exit_workers io_uring/io-wq.c:1248 [inline] io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1276 io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193 io_uring_cancel_generic+0x7dd/0x850 io_uring/io_uring.c:3080 io_uring_files_cancel include/linux/io_uring.h:20 [inline] do_exit+0x6a8/0x27f0 kernel/exit.c:838 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 get_signal+0x16a1/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f94ce577299 RSP: 002b:00007f94cf30f0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f94ce705f88 RCX: 00007f94ce577299 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f94ce705f88 RBP: 00007f94ce705f80 R08: 00007f94cf30f6c0 R09: 00007f94cf30f6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f94ce705f8c R13: 000000000000000b R14: 00007f94ce82f950 R15: 00007f94ce82fa38 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8e937660 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e937660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6620 6 locks held by kworker/u8:5/966: 1 lock held by dhcpcd/4898: #0: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1bc0 net/ipv4/devinet.c:1101 2 locks held by getty/4982: #0: ffff88802b2690a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211 3 locks held by kworker/1:6/5281: #0: ffff888015880948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888015880948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc90003f9fd00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90003f9fd00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 3 locks held by kworker/1:0/12092: #0: ffff888015880948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888015880948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc900032efd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc900032efd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 6 locks held by kworker/u8:16/12473: 3 locks held by kworker/u8:3/19133: #0: ffff88802a713948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff88802a713948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc9000407fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc9000407fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4194 3 locks held by kworker/u9:0/12644: #0: ffff888069a11948 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888069a11948 ((wq_completion)hci6){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc90004367d00 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc90004367d00 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffff88806af90d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open net/bluetooth/hci_core.c:417 [inline] #2: ffff88806af90d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_power_on+0x1bf/0x6b0 net/bluetooth/hci_core.c:948 3 locks held by kworker/u9:3/12678: #0: ffff888069747148 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888069747148 ((wq_completion)hci3){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc9000448fd00 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc9000448fd00 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffff8880483c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open net/bluetooth/hci_core.c:417 [inline] #2: ffff8880483c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_power_on+0x1bf/0x6b0 net/bluetooth/hci_core.c:948 1 lock held by iou-wrk-15131/15132: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 1 lock held by iou-wrk-15131/15134: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 1 lock held by iou-wrk-15131/15135: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 2 locks held by iou-wrk-15131/15136: 1 lock held by iou-wrk-15131/15137: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 1 lock held by iou-wrk-15131/15138: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 1 lock held by iou-wrk-15131/15139: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 1 lock held by iou-wrk-15131/15140: #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:244 [inline] #0: ffff8880635940a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd06/0x1010 io_uring/kbuf.c:568 1 lock held by syz.2.8634/17069: #0: ffffffff8e93ca38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline] #0: ffffffff8e93ca38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958 1 lock held by syz-executor/17071: #0: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644 1 lock held by syz.3.8612/17086: #0: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48f/0x2400 drivers/net/tun.c:3120 1 lock held by syz.3.8612/17088: #0: ffffffff8fc7fa48 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1bc0 net/ipv4/devinet.c:1101 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-syzkaller-12708-g2f8c4f506285 #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+0x241/0x360 lib/dump_stack.c:119 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+0xfee/0x1030 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13271 Comm: kworker/0:9 Not tainted 6.10.0-syzkaller-12708-g2f8c4f506285 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: events nsim_dev_trap_report_work RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:32 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:123 [inline] RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] RIP: 0010:_raw_spin_lock_irqsave+0x8d/0x120 kernel/locking/spinlock.c:162 Code: f3 4b 89 44 3d 00 4c 89 e3 48 c1 eb 03 42 80 3c 3b 00 74 08 4c 89 e7 e8 61 80 3b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 <42> 80 3c 3b 00 74 08 4c 89 e7 e8 54 7f 3b f6 4c 8b 64 24 20 fa 41 RSP: 0018:ffffc900037cf8a0 EFLAGS: 00000246 RAX: f3f3f300f1f1f1f1 RBX: 1ffff920006f9f18 RCX: 61c8864680b583eb RDX: 0000000000000001 RSI: ffffc900037cfa00 RDI: ffffffff951b1e88 RBP: ffffc900037cf930 R08: ffffc900037cfa07 R09: 0000000000000000 R10: ffffc900037cf9e0 R11: fffff520006f9f41 R12: ffffc900037cf8c0 R13: 1ffff920006f9f14 R14: ffffffff951b1e88 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559d5a558220 CR3: 000000000e734000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:979 [inline] debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1020 slab_free_hook mm/slub.c:2219 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x10f/0x350 mm/slub.c:4548 nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline] nsim_dev_trap_report_work+0x765/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 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