INFO: task syz.4.1169:10049 blocked for more than 145 seconds. Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.1169 state:D stack:26480 pid:10049 tgid:10049 ppid:7383 flags:0x00004004 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 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:632 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1420 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 put_fs_context+0xac/0x600 fs/fs_context.c:516 fscontext_release+0x47/0x60 fs/fsopen.c:73 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f609ff7def9 RSP: 002b:00007fff98f55ec8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000009f708 RCX: 00007f609ff7def9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f60a0137a80 R08: 0000000000000001 R09: 00007fff98f561bf R10: 00007f609fe00000 R11: 0000000000000246 R12: 000000000009f7d9 R13: 00007fff98f55fd0 R14: 0000000000000032 R15: ffffffffffffffff Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8ddba6a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8ddba6a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8ddba6a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626 4 locks held by kworker/1:2/1853: #0: ffff8880b893eb98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:560 #1: ffff8880b8928a48 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:989 #2: ffff8880b892a858 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5d/0x220 kernel/time/timer.c:1051 #3: ffffffff9a5ad188 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x199/0x540 lib/debugobjects.c:709 2 locks held by getty/4984: #0: ffff888030a1e0a0 (&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+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by syz.3.949/9146: #0: ffffffff8fb686f0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e1c7a08 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_nl_listener_set_doit+0xe3/0x1b20 fs/nfsd/nfsctl.c:1956 2 locks held by syz.4.1169/10049: #0: ffff8880216bc0e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880216bc0e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880216bc0e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1c7a08 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:632 2 locks held by syz.1.1216/10253: #0: ffff88805af860e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805af860e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805af860e0 (&type->s_umount_key#83){+.+.}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e1c7a08 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:632 2 locks held by syz.3.1584/11486: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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+0xf0c/0x1240 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: 1284 Comm: kworker/u8:7 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:unwind_get_return_address+0x53/0xe0 arch/x86/kernel/unwind_orc.c:369 Code: 3c 03 0f 8e 8b 00 00 00 8b 2b 31 ff 89 ee e8 b4 e2 4e 00 85 ed 75 13 e8 6b e0 4e 00 31 db 48 89 d8 5b 5d 41 5c c3 cc cc cc cc 58 e0 4e 00 4c 8d 63 48 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 RSP: 0018:ffffc90000a18778 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffc90000a187a0 RCX: ffffffff813cf86c RDX: ffff888028ed8000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: ffffc90000a187a0 R13: ffffffff817774c0 R14: ffffc90000a18860 R15: ffff888028ed8000 FS: 0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7318307ab8 CR3: 000000005ffd4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0xc1/0x170 arch/x86/kernel/stacktrace.c:26 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 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2250 [inline] slab_free mm/slub.c:4474 [inline] kmem_cache_free+0x12f/0x3a0 mm/slub.c:4549 skb_kfree_head net/core/skbuff.c:1084 [inline] skb_kfree_head net/core/skbuff.c:1081 [inline] skb_free_head+0x18a/0x1d0 net/core/skbuff.c:1098 skb_release_data+0x75d/0x990 net/core/skbuff.c:1125 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb net/core/skbuff.c:1204 [inline] consume_skb net/core/skbuff.c:1436 [inline] consume_skb+0xbf/0x100 net/core/skbuff.c:1430 mac80211_hwsim_tx_frame+0x1f3/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2216 __mac80211_hwsim_beacon_tx drivers/net/wireless/virtual/mac80211_hwsim.c:2232 [inline] mac80211_hwsim_beacon_tx+0x592/0xa00 drivers/net/wireless/virtual/mac80211_hwsim.c:2315 __iterate_interfaces+0x2d0/0x5d0 net/mac80211/util.c:774 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:810 mac80211_hwsim_beacon+0x105/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2345 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1770 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:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:394 [inline] RIP: 0010:__rcu_read_unlock+0x1b/0x580 kernel/rcu/tree_plugin.h:433 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 56 41 55 41 54 55 65 48 8b 2d 1d 07 91 7e 53 48 8d bd 44 04 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 RSP: 0018:ffffc9000471fb60 EFLAGS: 00000282 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc9000471fb18 RDX: 1ffff110051db15a RSI: ffffffff8b4cddc0 RDI: ffff888028ed8444 RBP: ffff888028ed8000 R08: 0000000000000000 R09: fffffbfff203b333 R10: ffffffff901d999f R11: 0000000000000000 R12: 0000000000000001 R13: 000000000003d8cc R14: 0000000000000000 R15: dffffc0000000000 rcu_read_unlock include/linux/rcupdate.h:871 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] batadv_nc_worker+0x891/0x1060 net/batman-adv/network-coding.c:719 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393 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