INFO: task syz-executor.4:6416 blocked for more than 143 seconds. Not tainted 6.14.0-rc3-syzkaller-g5cf80612d3f7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:25952 pid:6416 tgid:6415 ppid:6150 task_flags:0x400040 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x190e/0x4c90 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 blk_trace_ioctl+0x182/0x830 kernel/trace/blktrace.c:730 blkdev_ioctl+0x45f/0x6f0 block/ioctl.c:682 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0eb527dda9 RSP: 002b:00007f0eb60380c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0eb53abf80 RCX: 00007f0eb527dda9 RDX: 0000000020000380 RSI: 00000000c0481273 RDI: 0000000000000004 RBP: 00007f0eb52ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f0eb53abf80 R15: 00007fff153477d8 INFO: task syz-executor.4:6418 blocked for more than 144 seconds. Not tainted 6.14.0-rc3-syzkaller-g5cf80612d3f7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:26976 pid:6418 tgid:6415 ppid:6150 task_flags:0x400040 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x190e/0x4c90 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 blk_trace_remove kernel/trace/blktrace.c:406 [inline] blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 blkdev_common_ioctl+0xe6c/0x2460 block/ioctl.c:622 blkdev_ioctl+0x51d/0x6f0 block/ioctl.c:687 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf7/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0eb527dda9 RSP: 002b:00007f0eb60170c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0eb53ac050 RCX: 00007f0eb527dda9 RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004 RBP: 00007f0eb52ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f0eb53ac050 R15: 00007fff153477d8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746 2 locks held by kworker/u8:2/35: 3 locks held by kworker/u8:7/1130: #0: ffff88803081d148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff88803081d148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317 #1: ffffc9000448fc60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000448fc60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317 #2: ffffffff8fed5108 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #2: ffffffff8fed5108 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x10e/0x16a0 net/ipv6/addrconf.c:4190 2 locks held by getty/5584: #0: ffff88814cd020a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211 2 locks held by syz-executor.5/6413: 1 lock held by syz-executor.4/6416: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.4/6418: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.2/6619: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.2/6621: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.3/6677: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.3/6678: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.0/6705: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.0/6711: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.1/6708: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.1/6710: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.4/6719: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.4/6720: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.5/6723: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.5/6724: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.2/6740: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.2/6741: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.3/6763: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.3/6766: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.1/6828: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.1/6830: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.0/6838: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.0/6841: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.4/6845: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.4/6846: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.5/6849: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.5/6850: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.2/6858: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.2/6859: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.3/6879: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.3/6880: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.1/6916: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.1/6918: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.0/6948: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.0/6949: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.4/6979: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.4/6980: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.5/6983: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.5/6985: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 1 lock held by syz-executor.2/6987: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:631 1 lock held by syz-executor.2/6988: #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline] #0: ffff8881433fed98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x1b8/0x830 kernel/trace/blktrace.c:745 3 locks held by syz-executor.3/6990: #0: ffffffff8fed5108 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fed5108 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] #0: ffffffff8fed5108 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc55/0x1d30 net/core/rtnetlink.c:4021 #1: ffff888098ee14e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x22d/0x420 drivers/net/wireguard/device.c:50 #2: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline] #2: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x820 kernel/rcu/tree_exp.h:996 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc3-syzkaller-g5cf80612d3f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:236 [inline] watchdog+0x1058/0x10a0 kernel/hung_task.c:399 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 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: 6699 Comm: kworker/u8:9 Not tainted 6.14.0-rc3-syzkaller-g5cf80612d3f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: bat_events batadv_nc_worker RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [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:lock_acquire+0x180/0x550 kernel/locking/lockdep.c:5847 Code: 8d bc 24 80 00 00 00 4c 89 fb 48 c1 eb 03 42 80 3c 2b 00 74 08 4c 89 ff e8 4d 47 8c 00 48 c7 84 24 80 00 00 00 00 00 00 00 9c <8f> 84 24 80 00 00 00 42 80 3c 2b 00 74 08 4c 89 ff e8 3a 46 8c 00 RSP: 0018:ffffc90004e6f938 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff920009cdf38 RCX: ffffffff819cb144 RDX: 0000000000000000 RSI: ffffffff8c80eea0 RDI: ffffffff8c80ee60 RBP: ffffc90004e6faa0 R08: ffffffff903cec77 R09: 1ffffffff2079d8e R10: dffffc0000000000 R11: fffffbfff2079d8f R12: 1ffff920009cdf30 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90004e6f9c0 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555567142760 CR3: 000000002fcd0000 CR4: 0000000000350ef0 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xac0/0x18e0 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244