INFO: task syz-executor.2:5093 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc7-syzkaller-00049-g453f5db0619e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:22992 pid:5093  tgid:5093  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 wb_wait_for_completion+0x1ae/0x270 fs/fs-writeback.c:192
 sync_inodes_sb+0x1b7/0xa40 fs/fs-writeback.c:2758
 sync_filesystem+0x16f/0x280 fs/sync.c:64
 generic_shutdown_super+0x7e/0x3d0 fs/super.c:669
 kill_block_super+0x3b/0x90 fs/super.c:1667
 ext4_kill_sb+0x6a/0xb0 fs/ext4/super.c:7330
 deactivate_locked_super+0xbc/0x1a0 fs/super.c:484
 deactivate_super+0xde/0x100 fs/super.c:517
 cleanup_mnt+0x222/0x450 fs/namespace.c:1256
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x217/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f5a3b47e017
RSP: 002b:00007fff93299968 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f5a3b47e017
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fff93299a20
RBP: 00007fff93299a20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff9329aae0
R13: 00007f5a3b4c83b9 R14: 0000000000332ee7 R15: 000000000000001e
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
 #0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
6 locks held by kworker/1:1H/1184:
 #0: ffff8880b993c758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
 #1: ffff8880b9928888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988
 #2: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #2: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #2: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: blk_mq_run_work_fn+0x1c7/0x380 block/blk-mq.c:2434
 #3: ffff88801d7cd0d8 (&lo->lo_work_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
 #3: ffff88801d7cd0d8 (&lo->lo_work_lock){..-.}-{2:2}, at: loop_queue_work drivers/block/loop.c:838 [inline]
 #3: ffff88801d7cd0d8 (&lo->lo_work_lock){..-.}-{2:2}, at: loop_queue_rq+0x2bd/0x1210 drivers/block/loop.c:1882
 #4: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #4: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #4: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf2/0x11d0 kernel/workqueue.c:1724
 #5: ffff888013079018 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x399/0x11d0 kernel/workqueue.c:1760
2 locks held by getty/4815:
 #0: ffff888027d740a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900020482f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
2 locks held by syz-executor.2/5093:
 #0: ffff88803c6980e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88803c6980e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88803c6980e0 (&type->s_umount_key#31){++++}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:516
 #1: ffff888141bfc7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
 #1: ffff888141bfc7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x19d/0xa40 fs/fs-writeback.c:2756
4 locks held by kworker/u4:4/7986:
 #0: ffff888144258538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2602
 #1: ffffc900055b7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2603
 #2: ffff88807b0d6b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b4/0x690 mm/page-writeback.c:2553
 #3: ffff888084793488 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x5a7/0x1770 fs/ext4/inode.c:614
2 locks held by kworker/u4:31/11988:
 #0: ffff8880b993c758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
 #1: ffffc9000586fd80 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2603
2 locks held by kworker/u4:35/11992:

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.7.0-rc7-syzkaller-00049-g453f5db0619e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 23256 Comm: kworker/u4:0 Not tainted 6.7.0-rc7-syzkaller-00049-g453f5db0619e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 06 c1 da 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <f3> 0f 1e fa 65 48 8b 14 25 00 bd 03 00 65 8b 05 f4 57 7d 7e a9 00
RSP: 0018:ffffc9000582f068 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffffff8f26ead8 RCX: ffffffff8139ebf4
RDX: ffff88808e78a080 RSI: ffffffff8139ebfe RDI: 0000000000000006
RBP: ffffffff8f26eae4 R08: 0000000000000006 R09: ffffffff81304244
R10: ffffffff8130428a R11: 0000000000000004 R12: ffffffff81304244
R13: ffffffff8130428a R14: dffffc0000000000 R15: ffffffff8f26eae8
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0147bf8a0 CR3: 000000000cd77000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __orc_find+0xd7/0x130 arch/x86/kernel/unwind_orc.c:99
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x329/0x2390 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 __kasan_record_aux_stack+0x78/0x80 mm/kasan/generic.c:492
 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3400
 cfg80211_update_known_bss+0x802/0xa60 net/wireless/scan.c:1783
 __cfg80211_bss_update+0x1ba/0x24b0 net/wireless/scan.c:1827
 cfg80211_inform_single_bss_frame_data+0x768/0xf30 net/wireless/scan.c:2905
 cfg80211_inform_bss_frame_data+0xbf/0x290 net/wireless/scan.c:2936
 ieee80211_bss_info_update+0x300/0x8f0 net/mac80211/scan.c:205
 ieee80211_rx_bss_info net/mac80211/ibss.c:1098 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1577 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1973/0x3120 net/mac80211/ibss.c:1604
 ieee80211_iface_process_skb net/mac80211/iface.c:1589 [inline]
 ieee80211_iface_work+0xa67/0xda0 net/mac80211/iface.c:1643
 cfg80211_wiphy_work+0x24e/0x330 net/wireless/core.c:437
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>