INFO: task syz-executor.4:24259 blocked for more than 143 seconds. Not tainted 5.15.141-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27008 pid:24259 ppid: 22651 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376 schedule+0x11b/0x1f0 kernel/sched/core.c:6459 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518 rwsem_down_read_slowpath+0x605/0xb40 kernel/locking/rwsem.c:1047 __down_read_common kernel/locking/rwsem.c:1231 [inline] __down_read kernel/locking/rwsem.c:1244 [inline] down_read+0x9a/0x2e0 kernel/locking/rwsem.c:1490 iterate_supers+0xac/0x1e0 fs/super.c:703 ksys_sync+0xb9/0x1c0 fs/sync.c:102 __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+0x61/0xcb RIP: 0033:0x7f0ebf1d6ae9 RSP: 002b:00007f0ebd6f50c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f0ebf2f61f0 RCX: 00007f0ebf1d6ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f0ebf22247a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f0ebf2f61f0 R15: 00007ffdfd780758 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8c91f0e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by klogd/2953: #0: ffff8880b9b39718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 2 locks held by getty/3261: #0: ffff88814ae69098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc90002bab2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158 1 lock held by syz-executor.4/22524: #0: ffff88807d5b40e0 (&type->s_umount_key#99/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229 1 lock held by syz-executor.4/24259: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.0/24311: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.4/24340: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.3/24356: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.5/24353: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.1/24355: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.2/24373: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.4/24411: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 1 lock held by syz-executor.0/24414: #0: ffff88807d5b40e0 (&type->s_umount_key#100){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:703 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb 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:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 24360 Comm: kworker/u4:5 Not tainted 5.15.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:rcu_lock_release+0xa/0x20 include/linux/rcupdate.h:274 Code: 8c 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 68 a5 b8 f9 89 e8 a6 c5 68 f7 48 83 c4 08 c3 90 e8 bb 6c 86 f7 e8 b6 6c 86 f7 <48> c7 c7 e0 f0 91 8c 48 c7 c6 d5 b8 f9 89 e9 a3 eb 68 f7 0f 1f 00 RSP: 0018:ffffc9000552fbf0 EFLAGS: 00000293 RAX: ffffffff89f9b8da RBX: 0000000000000001 RCX: ffff888016dc1dc0 RDX: 0000000000000000 RSI: ffffffff8ad87d20 RDI: ffffffff8ad87ce0 RBP: 0000000000000001 R08: ffffffff89f93815 R09: fffffbfff1f79c19 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000005b R13: dffffc0000000000 R14: ffff88801a5dcc80 R15: ffff88801b2f1880 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000dd5000 CR3: 000000001e0ae000 CR4: 00000000003506e0 DR0: 0000000000000400 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:729 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:416 [inline] batadv_nc_worker+0x239/0x5b0 net/batman-adv/network-coding.c:723 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298