INFO: task syz-executor.2:18609 blocked for more than 143 seconds. Not tainted 6.3.0-rc5-syzkaller-00005-g148341f0a2f5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:21224 pid:18609 ppid:1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5307 [inline] __schedule+0x173b/0x4630 kernel/sched/core.c:6625 schedule+0xc3/0x180 kernel/sched/core.c:6701 schedule_timeout+0x1bd/0x310 kernel/time/timer.c:2167 gfs2_gl_hash_clear+0x1a3/0x310 fs/gfs2/glock.c:2198 gfs2_put_super+0x827/0x890 fs/gfs2/super.c:633 generic_shutdown_super+0x134/0x340 fs/super.c:500 kill_block_super+0x7e/0xe0 fs/super.c:1407 deactivate_locked_super+0xa4/0x110 fs/super.c:331 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6f30a8d5d7 RSP: 002b:00007ffdbe2731d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f6f30a8d5d7 RDX: 00007ffdbe2732ab RSI: 000000000000000a RDI: 00007ffdbe2732a0 RBP: 00007ffdbe2732a0 R08: 00000000ffffffff R09: 00007ffdbe273070 R10: 0000555555e4d8b3 R11: 0000000000000246 R12: 00007f6f30ae6cdc R13: 00007ffdbe274360 R14: 0000555555e4d810 R15: 00007ffdbe2743a0 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cf25530 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/13: #0: ffffffff8cf25d30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/28: #0: ffffffff8cf25360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4738: #0: ffff88802c5c4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2177 1 lock held by syz-executor.2/18609: #0: ffff8880299240e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:361 3 locks held by kworker/u4:15/23269: #0: ffff8880b993be98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:539 #1: ffff8880b9928788 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:976 #2: ffff888081e9cd40 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1115 [inline] #2: ffff888081e9cd40 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0xa4/0x1490 net/mac80211/ibss.c:1680 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc5-syzkaller-00005-g148341f0a2f5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x270/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 23269 Comm: kworker/u4:15 Not tainted 6.3.0-rc5-syzkaller-00005-g148341f0a2f5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: phy6 ieee80211_iface_work RIP: 0010:ieee80211_get_channel_khz+0x16e/0x910 Code: 00 00 00 00 00 fc ff df eb 8e 89 f9 80 e1 07 fe c1 38 c1 7c 9e e8 02 37 e6 f7 eb 97 e8 8b 80 90 f7 eb 1b e8 84 80 90 f7 eb 14 7d 80 90 f7 e9 c7 06 00 00 e8 73 80 90 f7 4c 8b 74 24 08 49 8d RSP: 0018:ffffc900059278b8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 000000000024cde0 RCX: dffffc0000000000 RDX: ffff888021feba80 RSI: 000000000024cde0 RDI: 000000000024cde0 RBP: ffff888035b5367c R08: ffffffff89f9d198 R09: ffffc900059277d0 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000000d R13: ffff888035b53680 R14: 0000000000000000 R15: 000000000024cde0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555f1f81680 CR3: 000000000cd30000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_get_channel include/net/cfg80211.h:6046 [inline] ieee80211_rx_bss_info net/mac80211/ibss.c:1114 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x5dd/0x2cf0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1583 [inline] ieee80211_iface_work+0x7bd/0xd00 net/mac80211/iface.c:1637 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2390 worker_thread+0xa63/0x1210 kernel/workqueue.c:2537 kthread+0x270/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308