INFO: task syz-executor.0:12053 blocked for more than 143 seconds. Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27168 pid:12053 tgid:12046 ppid:9548 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 super_lock+0x2bb/0x3f0 fs/super.c:114 user_get_super+0xee/0x230 fs/super.c:988 quotactl_block+0x3d2/0x680 fs/quota/quota.c:890 __do_sys_quotactl fs/quota/quota.c:955 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x173/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f52fd07dea9 RSP: 002b:00007f52fdd560c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f52fd1ac050 RCX: 00007f52fd07dea9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: ffffffff80000800 RBP: 00007f52fd0ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f52fd1ac050 R15: 00007ffee9219618 Showing all locks held in the system: 2 locks held by kworker/u8:1/11: 1 lock held by khungtaskd/29: #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 2 locks held by kworker/u8:4/60: #0: ffff8880b953ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559 #1: ffff8880b9528a08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988 4 locks held by kworker/u8:5/746: 2 locks held by getty/4830: #0: ffff88802b0060a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201 1 lock held by syz-executor.0/9387: 3 locks held by kworker/0:1/12877: #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1296/0x1ac0 kernel/workqueue.c:3229 #1: ffffc90003207d80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x906/0x1ac0 kernel/workqueue.c:3230 #2: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:276 1 lock held by syz-executor.1/13829: 2 locks held by syz-executor.3/13839: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x250 drivers/net/tun.c:3500 #1: ffffffff8d7bc538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #1: ffffffff8d7bc538 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x682/0x7a0 kernel/rcu/tree_exp.h:939 1 lock held by syz-executor.2/13860: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x4fc/0x4770 drivers/net/tun.c:3110 1 lock held by syz-executor.2/13864: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x62d/0x4770 drivers/net/tun.c:3110 1 lock held by syz-executor.2/13865: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: do_ipv6_setsockopt+0x2162/0x47b0 net/ipv6/ipv6_sockglue.c:567 1 lock held by syz-executor.0/13869: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x4fc/0x4770 drivers/net/tun.c:3110 1 lock held by syz-executor.0/13870: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x62d/0x4770 drivers/net/tun.c:3110 1 lock held by syz-executor.0/13871: #0: ffffffff8f2fff48 (rtnl_mutex){+.+.}-{3:3}, at: do_ipv6_setsockopt+0x2162/0x47b0 net/ipv6/ipv6_sockglue.c:567 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf86/0x1240 kernel/hung_task.c:380 kthread+0x2c1/0x3a0 kernel/kthread.c:388 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 PID: 746 Comm: kworker/u8:5 Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: netns cleanup_net RIP: 0010:__might_resched+0x1c/0x5e0 kernel/sched/core.c:10152 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 41 57 41 56 41 55 41 89 f5 41 54 49 89 fc <55> 89 d5 53 48 83 ec 50 48 c7 44 24 10 b3 8a b5 41 48 8d 5c 24 10 RSP: 0018:ffffc90003defa88 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 000000000007ffff RCX: 0000000000003a6b RDX: 0000000000000000 RSI: 0000000000000114 RDI: ffffffff8c381480 RBP: dffffc0000000000 R08: 0000000000000004 R09: 000000000007ffff R10: 0000000000003a6b R11: 0000000000000003 R12: ffffffff8c381480 R13: 0000000000000114 R14: ffffffff94a30940 R15: 0000000000003a6a FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555562f58938 CR3: 0000000054278000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000081 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inet_twsk_purge+0xfd/0x8f0 net/ipv4/inet_timewait_sock.c:276 ops_exit_list+0x128/0x180 net/core/net_namespace.c:175 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:637 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 vkms_vblank_simulate: vblank timer overrun