INFO: task syz-executor:5831 blocked for more than 143 seconds.
Not tainted 6.15.0-rc1-next-20250411-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20840 pid:5831 tgid:5831 ppid:1 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b9a/0x5250 kernel/sched/core.c:6769
__schedule_loop kernel/sched/core.c:6847 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6862
schedule_timeout+0xb1/0x2b0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x32f/0x600 kernel/sched/completion.c:148
kthread_stop+0x1a1/0x640 kernel/kthread.c:791
bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:428
__bch2_fs_read_only+0x47/0x4b0 fs/bcachefs/super.c:266
bch2_fs_read_only+0xd16/0x1400 fs/bcachefs/super.c:359
__bch2_fs_stop+0x107/0x5b0 fs/bcachefs/super.c:647
generic_shutdown_super+0x139/0x2d0 fs/super.c:643
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2303
deactivate_locked_super+0xc4/0x130 fs/super.c:474
cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
task_work_run+0x251/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdeb9d8e497
RSP: 002b:00007fff4f9bbce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdeb9e0e77c RCX: 00007fdeb9d8e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff4f9bbda0
RBP: 00007fff4f9bbda0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff4f9bce30
R13: 00007fdeb9e0e77c R14: 000000000001b81c R15: 00007fff4f9bce70
INFO: task bch-reclaim/loo:6174 blocked for more than 144 seconds.
Not tainted 6.15.0-rc1-next-20250411-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-reclaim/loo state:D stack:22528 pid:6174 tgid:6174 ppid:2 task_flags:0x200840 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b9a/0x5250 kernel/sched/core.c:6769
__schedule_loop kernel/sched/core.c:6847 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6862
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6919
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x805/0x10c0 kernel/locking/mutex.c:746
btree_write_buffer_flush_seq+0x1aec/0x1ca0 fs/bcachefs/btree_write_buffer.c:569
bch2_btree_write_buffer_journal_flush+0xc9/0x160 fs/bcachefs/btree_write_buffer.c:586
journal_flush_pins+0x89b/0xe40 fs/bcachefs/journal_reclaim.c:589
__bch2_journal_reclaim+0x789/0xda0 fs/bcachefs/journal_reclaim.c:720
bch2_journal_reclaim_thread+0x16d/0x580 fs/bcachefs/journal_reclaim.c:762
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
4 locks held by kworker/u8:1/13:
#0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc90000127c60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000127c60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffffffff900f6710 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17c/0xd60 net/core/net_namespace.c:608
#3: ffffffff90103248 (rtnl_mutex){+.+.}-{4:4}, at: netdev_wait_allrefs_any net/core/dev.c:11239 [inline]
#3: ffffffff90103248 (rtnl_mutex){+.+.}-{4:4}, at: netdev_run_todo+0x821/0xf30 net/core/dev.c:11351
1 lock held by khungtaskd/31:
#0: ffffffff8ed3f180 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3f180 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3f180 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
3 locks held by kworker/u8:4/78:
#0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000157fc60 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000157fc60 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffff8880b8639f18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:613
2 locks held by kworker/u8:5/751:
2 locks held by kworker/u8:6/2923:
2 locks held by getty/5588:
#0: ffff8880361d20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/5831:
#0: ffff8880326bc0e0 (&type->s_umount_key#65){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880326bc0e0 (&type->s_umount_key#65){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880326bc0e0 (&type->s_umount_key#65){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:506
#1: ffff888057000278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xff/0x5b0 fs/bcachefs/super.c:646
3 locks held by bch-reclaim/loo/6174:
#0: ffff88805704ad28 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x160/0x580 fs/bcachefs/journal_reclaim.c:761
#1: ffff888057004218 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffff888057004218 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffff888057004218 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7ed/0xd40 fs/bcachefs/btree_iter.c:3419
#2: ffff8880570045c0 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x1aec/0x1ca0 fs/bcachefs/btree_write_buffer.c:569
3 locks held by bch-copygc/loop/6175:
#0: ffff8880570045c0 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x1aec/0x1ca0 fs/bcachefs/btree_write_buffer.c:569
#1: ffff888057004218 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffff888057004218 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffff888057004218 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0x9a/0x1a0 fs/bcachefs/btree_iter.c:3232
#2: ffff888057026590 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x68a/0x16c0 fs/bcachefs/btree_update_interior.c:1179
2 locks held by kworker/u8:12/7427:
1 lock held by syz-executor/7856:
#0: ffffffff8ed446b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8ed446b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
1 lock held by syz.0.331/8220:
#0: ffff8880326bc0e0 (&type->s_umount_key#65){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880326bc0e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:121
3 locks held by syz-executor/8353:
#0: ffffffff8f896560 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8f896560 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8f896560 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:570
#1: ffffffff90103248 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#1: ffffffff90103248 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#1: ffffffff90103248 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xd68/0x1fe0 net/core/rtnetlink.c:4067
#2: ffffffff8ed446b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline]
#2: ffffffff8ed446b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x384/0x830 kernel/rcu/tree_exp.h:998
3 locks held by syz.2.354/8363:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc1-next-20250411-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5851 Comm: kworker/u9:7 Not tainted 6.15.0-rc1-next-20250411-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci6 hci_cmd_timeout
RIP: 0010:mark_lock_accessed kernel/locking/lockdep.c:1531 [inline]
RIP: 0010:__bfs kernel/locking/lockdep.c:1769 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1861 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2832 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3170 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3285 [inline]
RIP: 0010:validate_chain+0xd6a/0x24e0 kernel/locking/lockdep.c:3909
Code: 05 7b 38 d3 14 48 85 ed 0f 84 b1 01 00 00 48 8b 45 10 48 85 c0 0f 84 64 0d 00 00 8b 0d 67 38 d3 14 39 48 5c 0f 84 72 ff ff ff <89> 48 5c 48 8b 45 30 48 85 c0 74 21 0f b6 4d 2a 89 ca 80 e2 fa 80
RSP: 0018:ffffc9000410f030 EFLAGS: 00000087
RAX: ffffffff9412a598 RBX: ffffffff9412b888 RCX: 0000000000031461
RDX: 0000000000000008 RSI: ffff888051946600 RDI: 0000000000000145
RBP: ffffffff96f5cd18 R08: ffffc9000410eff0 R09: 0000000000000020
R10: 0000000000000000 R11: ffffffff819f90a0 R12: ffffffff9412b888
R13: 0000000000000001 R14: ffff8880519464c8 R15: ffff888051946590
FS: 0000000000000000(0000) GS:ffff888125080000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe68ad2f58 CR3: 000000003913a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd8/0x130 kernel/locking/spinlock.c:162
uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
serial8250_console_write+0x1b0/0x1e00 drivers/tty/serial/8250/8250_port.c:3415
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x86b/0xec0 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
_printk+0xd5/0x120 kernel/printk/printk.c:2475
bt_err+0x126/0x180 net/bluetooth/lib.c:296
hci_cmd_timeout+0x104/0x1e0 net/bluetooth/hci_core.c:1457
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245