INFO: task syz.5.521:10978 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.521       state:D stack:25128 pid:10978 tgid:10976 ppid:10072  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6936
 rwsem_down_read_slowpath+0x552/0x880 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x98/0x2e0 kernel/locking/rwsem.c:1526
 __super_lock fs/super.c:59 [inline]
 super_lock+0x2a9/0x3b0 fs/super.c:121
 user_get_super+0xc8/0x120 fs/super.c:998
 quotactl_block fs/quota/quota.c:890 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x4da/0x950 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc2ce78e929
RSP: 002b:00007fc2cf65a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fc2ce9b5fa0 RCX: 00007fc2ce78e929
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000600
RBP: 00007fc2ce810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000580 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc2ce9b5fa0 R15: 00007ffca4047708
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
4 locks held by udevd/5206:
 #0: ffff8880b8639e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
 #1: ffff8880b8623f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39e/0x6d0 kernel/sched/psi.c:987
 #2: ffffffff99ac9348 (&____s->seqcount#2){----}-{0:0}, at: ktime_get_coarse_real_ts64_mg+0x52/0x1e0 kernel/time/timekeeping.c:2307
 #3: ffffffff8de167c8 (rename_lock.seqcount){+.+.}-{0:0}, at: read_seqbegin include/linux/seqlock.h:836 [inline]
 #3: ffffffff8de167c8 (rename_lock.seqcount){+.+.}-{0:0}, at: read_seqbegin_or_lock include/linux/seqlock.h:1130 [inline]
 #3: ffffffff8de167c8 (rename_lock.seqcount){+.+.}-{0:0}, at: prepend_path+0x261/0x970 fs/d_path.c:171
2 locks held by getty/5600:
 #0: ffff88814ce990a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz-executor/6166:
1 lock held by syz.5.521/10978:
 #0: ffff888030f380e0 (&type->s_umount_key#66){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
 #0: ffff888030f380e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
3 locks held by kworker/0:8/11453:
1 lock held by syz-executor/12010:
1 lock held by syz-executor/12536:
 #0: ffffffff8e144bf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline]
 #0: ffffffff8e144bf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:998
3 locks held by syz.2.664/12966:
 #0: ffff888082080920 (&c->sb_lock){+.+.}-{4:4}, at: bch2_fs_alloc fs/bcachefs/super.c:917 [inline]
 #0: ffff888082080920 (&c->sb_lock){+.+.}-{4:4}, at: bch2_fs_open+0x11e5/0x2600 fs/bcachefs/super.c:2433
 #1: ffff8880820849d8 (&c->mark_lock){++++}-{0:0}, at: bch2_sb_replicas_to_cpu_replicas+0x117/0x1a0 fs/bcachefs/replicas.c:600
 #2: ffffffff8e144bf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
 #2: ffffffff8e144bf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:998

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:470
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12536 Comm: syz-executor Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__bfs kernel/locking/lockdep.c:1756 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1863 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2799 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3172 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3287 [inline]
RIP: 0010:validate_chain+0xe7d/0x2140 kernel/locking/lockdep.c:3911
Code: 00 00 0f 83 89 01 00 00 4e 8b 2c fd c0 47 a5 95 ff c0 25 ff 0f 00 00 89 05 80 38 07 14 4d 85 ed 0f 84 a7 01 00 00 49 8b 45 10 <48> 85 c0 0f 84 bb 0b 00 00 8b 0d 6c 38 07 14 39 48 5c 0f 84 6e ff
RSP: 0018:ffffc90004cbf1d8 EFLAGS: 00000082
RAX: ffffffff934cc320 RBX: 00000000000003fd RCX: ffffffff96397a68
RDX: 0000000000000008 RSI: 00000000000003fd RDI: ffff88802550bc00
RBP: ffffffff9346e110 R08: ffffc90004cbf1a0 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819eaba0 R12: ffffffff96298578
R13: ffffffff96397a68 R14: ffff88802550c808 R15: 000000000000027e
FS:  0000555567d42500(0000) GS:ffff888125d4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6fd4954eb8 CR3: 0000000047dee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
 do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
 psi_account_irqtime+0x310/0x7a0 kernel/sched/psi.c:1026
 __schedule+0x852/0x4cb0 kernel/sched/core.c:6779
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:412
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 0b 3b c8 f5 cc
RSP: 0018:ffffc90004cbf838 EFLAGS: 00000293
RAX: ffffffff83baf6dd RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802550bc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004cbf9f0 R08: ffff888079e22797 R09: 1ffff1100f3c44f2
R10: dffffc0000000000 R11: ffffed100f3c44f3 R12: dffffc0000000000
R13: ffff888055d11d01 R14: ffff888079e22780 R15: 0000000000000000
 btrfs_search_slot_get_root fs/btrfs/ctree.c:1752 [inline]
 btrfs_search_slot+0x87d/0x2d90 fs/btrfs/ctree.c:2048
 btrfs_del_orphan_item+0xcb/0x1d0 fs/btrfs/orphan.c:41
 btrfs_orphan_del fs/btrfs/inode.c:3527 [inline]
 btrfs_evict_inode+0xb12/0xe90 fs/btrfs/inode.c:5537
 evict+0x501/0x9c0 fs/inode.c:810
 d_delete_notify include/linux/fsnotify.h:402 [inline]
 vfs_rmdir+0x3ec/0x520 fs/namei.c:4483
 do_rmdir+0x2ac/0x630 fs/namei.c:4525
 __do_sys_unlinkat fs/namei.c:4699 [inline]
 __se_sys_unlinkat fs/namei.c:4693 [inline]
 __x64_sys_unlinkat+0xc2/0xf0 fs/namei.c:4693
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb1c0d8df07
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff67207eb8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fb1c0d8df07
RDX: 0000000000000200 RSI: 00007fff67209060 RDI: 00000000ffffff9c
RBP: 00007fb1c0e10925 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007fff67209060
R13: 00007fb1c0e10925 R14: 000000000008ce8e R15: 00007fff6720b220
 </TASK>