INFO: task syz.2.698:7239 blocked for more than 143 seconds. Not tainted 5.15.167-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.698 state:D stack:25208 pid: 7239 ppid: 7098 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6515 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 iterate_supers+0x127/0x1e0 fs/super.c:716 ksys_sync+0xd7/0x1c0 fs/sync.c:104 __do_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f8c02f85ff9 RSP: 002b:00007f8c013dd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f8c0313e058 RCX: 00007f8c02f85ff9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f8c02ff8296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8c0313e058 R15: 00007ffdd8495078 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8c91fc60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/0:2/2987: #0: ffff888017070938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc9000bcf7d20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffff88807a0c9240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2cd/0x4120 drivers/net/netdevsim/fib.c:1478 2 locks held by getty/3331: #0: ffff88814b5ff098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900024fe2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158 3 locks held by kworker/1:9/3656: #0: ffff8880b913a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 #1: ffff8880b9127848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x53d/0x810 kernel/sched/psi.c:891 #2: ffff8880b9128098 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:946 2 locks held by kworker/u4:12/3729: 3 locks held by syz-executor/5834: 2 locks held by syz.2.698/7239: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.3.965/8148: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.2.966/8156: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.0.1006/8351: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.0.1110/8724: #0: ffff8880656d60e0 (&type->s_umount_key#123 ){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.4.1137/8827: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.2.1145/8862: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.1.1166/8948: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 2 locks held by syz.0.1181/9020: #0: ffff8880656d60e0 (&type->s_umount_key#123){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:714 #1: ffff88801fe300e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:64 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xe72/0xeb0 kernel/hung_task.c:295 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3729 Comm: kworker/u4:12 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: phy40 ieee80211_iface_work RIP: 0010:__lock_acquire+0x759/0x1ff0 kernel/locking/lockdep.c:4962 Code: 63 f4 4b 8d 04 b6 48 8b 4c 24 18 4c 8d ac c1 10 0b 00 00 48 c7 c0 c0 8f 86 96 48 c1 e8 03 48 89 44 24 60 48 c7 c0 48 94 e9 8d <48> c1 e8 03 48 89 44 24 70 4c 89 ed 41 83 fc 31 0f 83 dd 01 00 00 RSP: 0018:ffffc90003087940 EFLAGS: 00000802 RAX: ffffffff8de99448 RBX: 0000000000081260 RCX: ffff888029c03b80 RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff888029c04654 RBP: 00000000ffffffff R08: dffffc0000000000 R09: fffffbfff20e2426 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff888029c04690 R14: 0000000000000000 R15: ffff888029c04604 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2d68c8b440 CR3: 000000005a2df000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] kcov_remote_start+0xb0/0x480 kernel/kcov.c:858 kcov_remote_start_common include/linux/kcov.h:50 [inline] ieee80211_iface_work+0x205/0xcc0 net/mac80211/iface.c:1490 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287