INFO: task syz.2.16:4004 blocked for more than 143 seconds.
Not tainted 6.10.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.16 state:D stack:10504 pid:4004 tgid:4003 ppid:3645 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5407 [inline]
__schedule+0x69f/0x1400 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xac/0x140 kernel/sched/core.c:6840
__closure_sync+0x53/0x80 lib/closure.c:146
closure_sync include/linux/closure.h:195 [inline]
bch2_btree_update_start+0x6a2/0x7c0 fs/bcachefs/btree_update_interior.c:1267
bch2_btree_split_leaf+0x4e/0x210 fs/bcachefs/btree_update_interior.c:1851
bch2_trans_commit_error+0x1b6/0x3f0 fs/bcachefs/btree_trans_commit.c:961
__bch2_trans_commit+0x736/0x1c50 fs/bcachefs/btree_trans_commit.c:1189
bch2_trans_commit fs/bcachefs/btree_update.h:183 [inline]
bch2_btree_write_buffer_flush_locked+0xde9/0x1080 fs/bcachefs/btree_write_buffer.c:429
btree_write_buffer_flush_seq+0x2cc/0x330 fs/bcachefs/btree_write_buffer.c:510
bch2_btree_write_buffer_journal_flush+0x2e/0x60 fs/bcachefs/btree_write_buffer.c:525
journal_flush_pins+0x23d/0x390 fs/bcachefs/journal_reclaim.c:553
journal_flush_done+0x4b/0xe0 fs/bcachefs/journal_reclaim.c:806
bch2_journal_flush_pins+0x12e/0x150 fs/bcachefs/journal_reclaim.c:839
bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
__bch2_fs_read_only+0x84/0x180 fs/bcachefs/super.c:277
bch2_fs_read_only+0x276/0x440 fs/bcachefs/super.c:357
__bch2_fs_stop+0x50/0x230 fs/bcachefs/super.c:619
bch2_fs_stop fs/bcachefs/super.c:678 [inline]
bch2_fs_open+0xf04/0x12d0 fs/bcachefs/super.c:2161
bch2_mount fs/bcachefs/fs.c:1924 [inline]
bch2_fs_get_tree+0x266/0x650 fs/bcachefs/fs.c:2088
vfs_get_tree+0x26/0xb0 fs/super.c:1789
do_new_mount+0x132/0x360 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x13c/0x1a0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x8f/0x170 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f09d9010a
RSP: 002b:00007f4f0ab5fe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4f0ab5fef0 RCX: 00007f4f09d9010a
RDX: 00002000000000c0 RSI: 0000200000005c80 RDI: 00007f4f0ab5feb0
RBP: 00002000000000c0 R08: 00007f4f0ab5fef0 R09: 0000000000000010
R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000005c80
R13: 00007f4f0ab5feb0 R14: 0000000000005a38 R15: 0000200000000100
INFO: task bch-reclaim/loo:4012 blocked for more than 143 seconds.
Not tainted 6.10.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-reclaim/loo state:D stack:14584 pid:4012 tgid:4012 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5407 [inline]
__schedule+0x69f/0x1400 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xac/0x140 kernel/sched/core.c:6840
schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6897
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x43a/0x9c0 kernel/locking/mutex.c:752
bch2_journal_reclaim_thread+0x73/0x160 fs/bcachefs/journal_reclaim.c:726
kthread+0xe9/0x100 kernel/kthread.c:389
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8457f798 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#0: ffffffff8457f798 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#0: ffffffff8457f798 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6614
2 locks held by getty/2312:
#0: ffff88810770d8a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243
#1: ffffc9000494f2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x18a/0x690 drivers/tty/n_tty.c:2211
5 locks held by syz.2.16/4004:
#0: ffff88811a800278 (&c->state_lock){....}-{3:3}, at: __bch2_fs_stop+0x48/0x230 fs/bcachefs/super.c:618
#1: ffff88811a84afe8 (&j->reclaim_lock){....}-{3:3}, at: journal_flush_done+0x36/0xe0 fs/bcachefs/journal_reclaim.c:804
#2: ffff88811a8042d0 (&c->btree_trans_barrier){....}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline]
#2: ffff88811a8042d0 (&c->btree_trans_barrier){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline]
#2: ffff88811a8042d0 (&c->btree_trans_barrier){....}-{0:0}, at: __bch2_trans_get+0x24c/0x3a0 fs/bcachefs/btree_iter.c:3193
#3: ffff88811a804718 (&wb->flushing.lock){....}-{3:3}, at: btree_write_buffer_flush_seq+0x2c4/0x330 fs/bcachefs/btree_write_buffer.c:509
#4: ffff88811a826750 (&c->gc_lock){....}-{3:3}, at: bch2_btree_update_start+0x2e8/0x7c0 fs/bcachefs/btree_update_interior.c:1195
1 lock held by bch-reclaim/loo/4012:
#0: ffff88811a84afe8 (&j->reclaim_lock){....}-{3:3}, at: bch2_journal_reclaim_thread+0x73/0x160 fs/bcachefs/journal_reclaim.c:726
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x7f/0xc0 lib/dump_stack.c:114
nmi_cpu_backtrace+0xe6/0x140 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0x5dd/0x600 kernel/hung_task.c:379
kthread+0xe9/0x100 kernel/kthread.c:389
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 518 Comm: kworker/u8:5 Not tainted 6.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:update_rq_clock_pelt kernel/sched/pelt.h:119 [inline]
RIP: 0010:update_rq_clock_task kernel/sched/core.c:747 [inline]
RIP: 0010:update_rq_clock+0x9e/0xc0 kernel/sched/core.c:769
Code: f6 40 2c 02 75 36 48 b8 ff ff ff ff ff ff 3f 00 48 21 c1 48 63 83 68 0b 00 00 48 8b 04 c5 e0 e8 15 84 48 0f af 88 28 ba 01 00 <48> c1 f9 0a 48 01 8b c8 0a 00 00 5b c3 cc cc cc cc cc 48 89 df 5b
RSP: 0000:ffffc90002323d20 EFLAGS: 00000006
RAX: ffff88813bd00000 RBX: ffff88813bd31b00 RCX: 000000010e572400
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff85766040
RBP: ffffc90002323dd0 R08: 0000000000000004 R09: 00000038ec346cb6
R10: 0000000000000002 R11: ffffffff8103f820 R12: ffff888100087000
R13: ffff888100090000 R14: ffff88813bd31b00 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43abb79000 CR3: 0000000004444000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__schedule+0xe5/0x1400 kernel/sched/core.c:6660
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xac/0x140 kernel/sched/core.c:6840
toggle_allocation_gate+0x9e/0x110 mm/kfence/core.c:828
process_one_work kernel/workqueue.c:3248 [inline]
process_scheduled_works+0x2c5/0x5c0 kernel/workqueue.c:3329
worker_thread+0x23f/0x2f0 kernel/workqueue.c:3409
kthread+0xe9/0x100 kernel/kthread.c:389
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244