INFO: task syz.3.735:12132 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.735 state:D stack:25024 pid:12132 tgid:12130 ppid:11606 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 __super_lock fs/super.c:58 [inline] super_lock+0x27c/0x400 fs/super.c:120 user_get_super+0xd2/0x180 fs/super.c:1000 quotactl_block fs/quota/quota.c:890 [inline] __do_sys_quotactl fs/quota/quota.c:955 [inline] __se_sys_quotactl+0x527/0xa30 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f308cf7dff9 RSP: 002b:00007f308dcc6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f308d135f80 RCX: 00007f308cf7dff9 RDX: 0000000000000000 RSI: 0000000020000240 RDI: ffffffff80000801 RBP: 00007f308cff0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000f00 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f308d135f80 R15: 00007ffedde726f8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 3 locks held by kworker/u8:2/35: #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000ab7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000ab7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 5 locks held by kworker/u8:8/2922: #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90009ba7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90009ba7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcb3110 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580 #3: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xaa0 net/core/dev.c:11934 #4: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #4: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 3 locks held by kworker/u8:9/2935: 1 lock held by dhcpcd/4894: #0: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1aa0 net/ipv4/devinet.c:1097 2 locks held by getty/4985: #0: ffff88802e8a10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/11156: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffffffff8ed5c368 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb2/0x530 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.3.735/12132: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.4.743/12278: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.2.752/12314: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.0.774/12481: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.4.850/12782: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.0.857/12817: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 3 locks held by kworker/u9:0/13413: #0: ffff8880773c4948 ((wq_completion)hci9){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff8880773c4948 ((wq_completion)hci9){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90004227d00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90004227d00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff88805d910d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1ec/0x400 net/bluetooth/hci_sync.c:327 1 lock held by syz.3.914/13430: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/13550: #0: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517 1 lock held by syz.4.946/13560: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.3.968/13732: #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802deb80e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/13893: #0: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48c/0x2400 drivers/net/tun.c:3121 1 lock held by syz-executor/13921: #0: ffffffff8fcbfc08 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48c/0x2400 drivers/net/tun.c:3121 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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: 2935 Comm: kworker/u8:9 Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:stack_trace_consume_entry+0x0/0x280 kernel/stacktrace.c:83 Code: d3 7a 00 e9 6a ff ff ff e8 fd 65 3c 0a 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 fb 48 RSP: 0018:ffffc90009e773f8 EFLAGS: 00000286 RAX: ffffffff81ef6490 RBX: ffffc90009e77400 RCX: ffffffff9179c000 RDX: ffffffff91947d01 RSI: ffffffff81ef6490 RDI: ffffc90009e774e0 RBP: ffffc90009e77490 R08: ffffc90009e7745f R09: 0000000000000000 R10: ffffc90009e77450 R11: ffffffff8180a090 R12: ffff88802ea49e00 R13: ffffffff8180a090 R14: ffffc90009e774e0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 000000002fd58000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x10e/0x150 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x1a0/0x440 mm/slub.c:4727 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1580 [inline] ieee80211_ibss_rx_queued_mgmt+0x1b1e/0x2d70 net/mac80211/ibss.c:1606 ieee80211_iface_process_skb net/mac80211/iface.c:1603 [inline] ieee80211_iface_work+0x8a5/0xf20 net/mac80211/iface.c:1657 cfg80211_wiphy_work+0x2db/0x490 net/wireless/core.c:440 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244