INFO: task syz-executor.0:5491 blocked for more than 143 seconds. Not tainted 6.9.0-rc5-syzkaller-00036-g9d1ddab261f3 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26584 pid:5491 tgid:5490 ppid:5424 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x1796/0x4a00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 bdev_release+0x1c8/0x720 block/bdev.c:1059 blkdev_release+0x15/0x20 block/fops.c:628 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 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+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f891347bdb9 RSP: 002b:00007f89141a20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f891359bf80 RCX: 00007f891347bdb9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007f89134d8ad0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f891359bf80 R15: 00007ffc625ebf08 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4824: #0: ffff88802ff7a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 1 lock held by udevd/5412: #0: ffff888020a3b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xdd/0xcb0 block/bdev.c:877 1 lock held by syz-executor.0/5491: #0: ffff888020a3b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x1c8/0x720 block/bdev.c:1059 1 lock held by syz-executor.0/5798: #0: ffff888020a3b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xdd/0xcb0 block/bdev.c:877 1 lock held by syz-executor.0/5814: #0: ffff888020a3b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xdd/0xcb0 block/bdev.c:877 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc5-syzkaller-00036-g9d1ddab261f3 #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+0x241/0x360 lib/dump_stack.c:114 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:380 kthread+0x2f0/0x390 kernel/kthread.c:388 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3825 Comm: kworker/u8:8 Not tainted 6.9.0-rc5-syzkaller-00036-g9d1ddab261f3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:cfg80211_find_elem_match net/wireless/scan.c:1349 [inline] RIP: 0010:cfg80211_find_ie_match include/net/cfg80211.h:6743 [inline] RIP: 0010:cfg80211_find_ie include/net/cfg80211.h:6787 [inline] RIP: 0010:cmp_bss+0x570/0xea0 net/wireless/scan.c:1443 Code: ff c5 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 5e 44 0f b6 7d 00 49 8d 6f 02 48 89 df 48 89 ee cb 82 ce f6 48 39 eb 72 74 4c 89 e5 4c 89 e0 48 c1 e8 03 48 b9 RSP: 0018:ffffc9000d226e28 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000028 RCX: dffffc0000000000 RDX: ffff88802e450000 RSI: 0000000000000008 RDI: 0000000000000028 RBP: 0000000000000008 R08: ffffffff8ac77fb5 R09: fffff52001a44de8 R10: dffffc0000000000 R11: fffff52001a44de8 R12: ffff88802225c81d R13: ffff888028932c00 R14: ffff88802225c845 R15: 0000000000000006 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bf51fec600 CR3: 000000002dc1c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rb_find_bss net/wireless/scan.c:1632 [inline] __cfg80211_bss_update+0xda/0x20c0 net/wireless/scan.c:1890 cfg80211_inform_single_bss_data+0xec6/0x22e0 net/wireless/scan.c:2264 cfg80211_inform_bss_data+0x3e3/0x57d0 net/wireless/scan.c:3067 cfg80211_inform_bss_frame_data+0x3bc/0x720 net/wireless/scan.c:3157 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226 ieee80211_rx_bss_info net/mac80211/ibss.c:1099 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1578 [inline] ieee80211_ibss_rx_queued_mgmt+0x1962/0x2d70 net/mac80211/ibss.c:1605 ieee80211_iface_process_skb net/mac80211/iface.c:1605 [inline] ieee80211_iface_work+0x8a3/0xf10 net/mac80211/iface.c:1659 cfg80211_wiphy_work+0x221/0x260 net/wireless/core.c:437 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244