INFO: task syz-executor:5854 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc6-next-20250716-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20488 pid:5854  tgid:5854  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5314 [inline]
 __schedule+0x16fd/0x4cf0 kernel/sched/core.c:6697
 __schedule_loop kernel/sched/core.c:6775 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6790
 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
 kthread_stop+0x194/0x5f0 kernel/kthread.c:790
 bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:436
 __bch2_fs_read_only+0x4a/0x4f0 fs/bcachefs/super.c:303
 bch2_fs_read_only+0x3bc/0x940 fs/bcachefs/super.c:389
 __bch2_fs_stop+0xc9/0x8c0 fs/bcachefs/super.c:700
 generic_shutdown_super+0x135/0x2c0 fs/super.c:643
 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2586
 deactivate_locked_super+0xb9/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff838f8fc57
RSP: 002b:00007ffd230a9728 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff839010a8d RCX: 00007ff838f8fc57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd230a97e0
RBP: 00007ffd230a97e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd230aa870
R13: 00007ff839010a8d R14: 00000000000233b0 R15: 00007ffd230aa8b0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e13e2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e13e2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e13e2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5607:
 #0: ffff88814d67e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/5854:
 #0: ffff88802820e0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
 #0: ffff88802820e0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
 #0: ffff88802820e0e0 (&type->s_umount_key#57){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
 #1: ffff88804f980278 (&c->state_lock){++++}-{4:4}, at: class_rwsem_write_constructor include/linux/rwsem.h:257 [inline]
 #1: ffff88804f980278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xc1/0x8c0 fs/bcachefs/super.c:699
2 locks held by bch-copygc/loop/7322:
 #0: ffff88804f9843a8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
 #0: ffff88804f9843a8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
 #0: ffff88804f9843a8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220 fs/bcachefs/btree_iter.c:3293
 #1: ffff88804f9a6710 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0 fs/bcachefs/btree_update_interior.c:1196
1 lock held by syz.5.391/7685:
 #0: ffff88802820e0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
 #0: ffff88802820e0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
2 locks held by syz.4.1651/11158:
 #0: ffff88805a6d14d8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_valid_genid+0x3b/0x100 net/netfilter/nf_tables_api.c:11513
 #1: ffffffff8e143e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
 #1: ffffffff8e143e38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:967

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-next-20250716-syzkaller #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:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:491
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11158 Comm: syz.4.1651 Not tainted 6.16.0-rc6-next-20250716-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:folio_lruvec_relock_irqsave include/linux/memcontrol.h:1536 [inline]
RIP: 0010:__page_cache_release+0x9e5/0xc10 mm/swap.c:77
Code: f3 27 00 48 8b 04 24 83 f0 02 48 89 04 24 49 83 c6 22 4d 89 37 4c 8b 7c 24 18 43 80 3c 27 00 0f 85 ca fa ff ff e9 cd fa ff ff <e8> 86 2d c3 ff 49 bc 00 00 00 00 00 fc ff df 4c 8b 6c 24 10 43 80
RSP: 0018:ffffc9001d497158 EFLAGS: 00000046
RAX: ffff88801ba88d00 RBX: ffffea0001043ec0 RCX: ffff888032168000
RDX: 0000000000000000 RSI: 00000000ff000000 RDI: 00000000f5000000
RBP: ffffea0001043ec8 R08: ffffea0001043ec7 R09: 1ffffd40002087d8
R10: dffffc0000000000 R11: fffff940002087d9 R12: ffff88801ba88d00
R13: ffff88801ce89080 R14: ffffc9001d497218 R15: 1ffff92003a92e43
FS:  0000000000000000(0000) GS:ffff888125be2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33c00ff8 CR3: 0000000025382000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 folios_put_refs+0x37d/0x640 mm/swap.c:977
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1149
 shmem_truncate_range mm/shmem.c:1261 [inline]
 shmem_evict_inode+0x272/0xa70 mm/shmem.c:1389
 evict+0x501/0x9c0 fs/inode.c:810
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 dput+0x19f/0x2b0 fs/dcache.c:911
 __fput+0x68e/0xa70 fs/file_table.c:476
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:959
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1100
 get_signal+0x1286/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3cd678e929
Code: Unable to access opcode bytes at 0x7f3cd678e8ff.
RSP: 002b:00007f3cd754f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3cd69b5fa8 RCX: 00007f3cd678e929
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3cd69b5fa8
RBP: 00007f3cd69b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3cd69b5fac
R13: 0000000000000000 R14: 00007fff4948c1e0 R15: 00007fff4948c2c8
 </TASK>