INFO: task syz-executor.5:16843 blocked for more than 143 seconds. Not tainted 6.5.0-rc3-syzkaller-00018-g0b5547c51827 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:24584 pid:16843 ppid:5063 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:65 iterate_supers+0x12b/0x1e0 fs/super.c:744 ksys_sync+0xdb/0x1c0 fs/sync.c:104 __do_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0e8c07cb29 RSP: 002b:00007f0e8ce170c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f0e8c19bf80 RCX: 00007f0e8c07cb29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f0e8c0c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f0e8c19bf80 R15: 00007ffc3104edd8 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8d328db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffffffff8d329170 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff8d328be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/4773: #0: ffff888029303098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187 3 locks held by syz-executor.3/31143: 3 locks held by kworker/u4:18/5345: #0: ffff8880b983bf98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 #1: ffffc90014a97d00 ((work_completion)(&(&bat_priv->orig_work)->work)){+.+.}-{0:0}, at: process_one_work+0x82b/0x12c0 kernel/workqueue.c:2571 #2: ffffffff8d328be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x40 include/linux/rcupdate.h:302 2 locks held by syz-executor.5/16843: #0: ffff888019fea0e0 (&type->s_umount_key#71){++++}-{3:3}, at: iterate_supers+0xb0/0x1e0 fs/super.c:742 #1: ffff888029d520e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/17008: #0: ffff888019fea0e0 (&type->s_umount_key#71){++++}-{3:3}, at: iterate_supers+0xb0/0x1e0 fs/super.c:742 #1: ffff888029d520e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/17095: #0: ffff888019fea0e0 (&type->s_umount_key#71){++++}-{3:3}, at: iterate_supers+0xb0/0x1e0 fs/super.c:742 #1: ffff888029d520e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/17096: #0: ffff888019fea0e0 (&type->s_umount_key#71){++++}-{3:3}, at: iterate_supers+0xb0/0x1e0 fs/super.c:742 #1: ffff888029d520e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x6b/0x100 fs/exfat/super.c:65 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc3-syzkaller-00018-g0b5547c51827 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5345 Comm: kworker/u4:18 Not tainted 6.5.0-rc3-syzkaller-00018-g0b5547c51827 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:203 Code: 00 00 00 00 00 0f 1f 44 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 94 48 0c 0d 48 89 de 5b e9 93 e7 57 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 0d a0 9f 77 7e 65 8b 15 a1 9f 77 RSP: 0018:ffffc90014a97ba8 EFLAGS: 00000293 RAX: ffffffff8a8d07f5 RBX: 0000000000000001 RCX: ffff888027a93b80 RDX: 0000000000000000 RSI: ffffffff8b58a560 RDI: ffffffff8b58a520 RBP: 0000000000000001 R08: ffffffff8a8c8cc9 R09: 1ffffffff20f6260 R10: dffffc0000000000 R11: fffffbfff20f6261 R12: 0000000000000151 R13: dffffc0000000000 R14: ffff8880223ecc80 R15: ffff888145eca780 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c001b5d000 CR3: 000000000d130000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release+0xe/0x30 include/linux/rcupdate.h:308 rcu_read_unlock include/linux/rcupdate.h:782 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] batadv_nc_worker+0x23d/0x5c0 net/batman-adv/network-coding.c:719 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000