INFO: task kworker/0:7:31139 blocked for more than 143 seconds. Not tainted 6.1.43-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:7 state:D stack:22912 pid:31139 ppid:2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x132c/0x4330 kernel/sched/core.c:6554 schedule+0xbf/0x180 kernel/sched/core.c:6630 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6689 __mutex_lock_common+0xe2b/0x2520 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 linkwatch_event+0xa/0x50 net/core/link_watch.c:263 process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2292 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2439 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d129930 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:516 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d12a130 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:516 1 lock held by khungtaskd/28: #0: ffffffff8d129760 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/3300: #0: ffff888029279098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188 3 locks held by kworker/0:7/31139: #0: ffff888012464d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0 #1: ffffc90009e17d20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2267 #2: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263 3 locks held by kworker/1:8/17497: #0: ffff88814b6b6138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0 #1: ffffc90015ddfd20 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2267 #2: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x15/0x30 net/ipv6/addrconf.c:4634 3 locks held by kworker/0:18/20375: #0: ffff88814b6b6138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0 #1: ffffc90005e6fd20 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2267 #2: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x15/0x30 net/ipv6/addrconf.c:4634 2 locks held by syz-executor.5/28171: 2 locks held by syz-executor.0/28187: #0: ffffffff8e300050 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860 #1: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: ethnl_default_doit+0x4fa/0xcc0 net/ethtool/netlink.c:383 1 lock held by syz-executor.1/28190: #0: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x720/0xf00 net/core/rtnetlink.c:6100 1 lock held by syz-executor.5/28208: #0: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x720/0xf00 net/core/rtnetlink.c:6100 1 lock held by syz-executor.5/28218: #0: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8e297ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x720/0xf00 net/core/rtnetlink.c:6100 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.43-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 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+0xf18/0xf60 kernel/hung_task.c:377 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7091 Comm: kworker/u4:2 Not tainted 6.1.43-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:hlock_class kernel/locking/lockdep.c:223 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4755 [inline] RIP: 0010:__lock_acquire+0x759/0x1f80 kernel/locking/lockdep.c:5006 Code: 91 48 c1 e8 03 48 89 44 24 50 48 c7 c0 a8 a4 73 8e 48 c1 e8 03 48 89 44 24 68 4c 89 ed 41 83 fc 31 0f 83 df 01 00 00 48 89 e8 <48> c1 e8 03 0f b6 04 10 84 c0 0f 85 2f 01 00 00 41 8b 5d 00 81 e3 RSP: 0018:ffffc9000c6979a0 EFLAGS: 00000097 RAX: ffff8880883ba8c0 RBX: ffff8880883ba884 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffff8880883ba8a0 RDI: ffffffff90497220 RBP: ffff8880883ba8c0 R08: dffffc0000000000 R09: fffffbfff2092e45 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff8880883ba8c0 R14: 0000000000000000 R15: 1ffff11011077504 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00b0e9000 CR3: 000000000ce8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:306 rcu_read_lock include/linux/rcupdate.h:747 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xc1/0x5b0 net/batman-adv/network-coding.c:719 process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2292 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2439 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306