INFO: task syz-executor.4:26227 blocked for more than 143 seconds. Not tainted 6.1.62-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23224 pid:26227 ppid:24379 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x142d/0x4550 kernel/sched/core.c:6554 schedule+0xbf/0x180 kernel/sched/core.c:6630 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6689 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 iterate_supers+0x127/0x1e0 fs/super.c:746 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff31e47cae9 RSP: 002b:00007ff31f1820c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007ff31e59c120 RCX: 00007ff31e47cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ff31e4c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007ff31e59c120 R15: 00007ffcd9b51218 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d12a230 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d12aa30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516 1 lock held by khungtaskd/28: #0: ffffffff8d12a060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline] #0: ffffffff8d12a060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8d12a060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6493 2 locks held by getty/3310: #0: ffff88814b073098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188 3 locks held by syz-executor.4/24311: 3 locks held by syz-executor.0/24368: 2 locks held by syz-executor.4/26227: #0: ffff88801fe460e0 (&type->s_umount_key#69){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:744 #1: ffff88807a10a0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.1/26333: #0: ffff88801fe460e0 (&type->s_umount_key#69){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:744 #1: ffff88807a10a0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.4/26398: #0: ffff88801fe460e0 (&type->s_umount_key#69){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:744 #1: ffff88807a10a0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.4/26459: #0: ffff88801fe460e0 (&type->s_umount_key#69){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:744 #1: ffff88807a10a0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.1/26463: #0: ffff88801fe460e0 (&type->s_umount_key#69){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:744 #1: ffff88807a10a0e0 (&sbi->s_lock#2){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.62-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xf88/0xfd0 kernel/hung_task.c:377 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 26263 Comm: kworker/u4:26 Not tainted 6.1.62-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:task_wait_context kernel/locking/lockdep.c:4662 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4743 [inline] RIP: 0010:__lock_acquire+0x6ed/0x1f80 kernel/locking/lockdep.c:4998 Code: df e9 65 ff ff ff 65 8b 05 84 1f 98 7e 41 b7 02 85 c0 48 8b 5c 24 10 75 1f 48 8b 44 24 58 0f b6 04 10 84 c0 0f 85 9f 14 00 00 <83> 3b 00 41 0f 94 c7 45 00 ff 41 80 c7 02 48 8b 44 24 28 0f b6 04 RSP: 0018:ffffc9000395f9a0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880296c6404 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffff8880296c6420 RDI: ffffffff9048c220 RBP: 00000000ffffffff R08: dffffc0000000000 R09: fffffbfff2091845 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff8880296c5940 R14: ffff8880296c6490 R15: 1ffff110052d8c02 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c003ae5000 CR3: 000000000ce8e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 rcu_lock_acquire include/linux/rcupdate.h:306 [inline] rcu_read_lock include/linux/rcupdate.h:747 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xe8/0x610 net/batman-adv/network-coding.c:719 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306