INFO: task kworker/u8:20:11265 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:20 state:D stack:20896 pid:11265 tgid:11265 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: btree_node_rewrite async_btree_node_rewrite_work
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
__closure_sync+0x163/0x220 lib/closure.c:146
bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:315 [inline]
bch2_btree_update_start+0x18dc/0x1de0 fs/bcachefs/btree_update_interior.c:1293
bch2_btree_node_rewrite+0x17e/0x1120 fs/bcachefs/btree_update_interior.c:2246
bch2_btree_node_rewrite_key+0x273/0x320 fs/bcachefs/btree_update_interior.c:2312
async_btree_node_rewrite_work+0x110/0x4f0 fs/bcachefs/btree_update_interior.c:2369
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.7.4472:21781 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.4472 state:D stack:19672 pid:21781 tgid:21780 ppid:21289 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
__closure_sync+0x163/0x220 lib/closure.c:146
bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:315 [inline]
bch2_btree_update_start+0x18dc/0x1de0 fs/bcachefs/btree_update_interior.c:1293
bch2_btree_split_leaf+0x14b/0x8e0 fs/bcachefs/btree_update_interior.c:1921
bch2_trans_commit_error+0x1b7/0x1130 fs/bcachefs/btree_trans_commit.c:914
__bch2_trans_commit+0x1bb5/0x8880 fs/bcachefs/btree_trans_commit.c:1104
bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
bch2_journal_replay+0x1e85/0x2630 fs/bcachefs/recovery.c:440
bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline]
__bch2_run_recovery_passes+0x3bd/0x1060 fs/bcachefs/recovery_passes.c:539
bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:610
bch2_fs_recovery+0x2690/0x3a50 fs/bcachefs/recovery.c:1016
bch2_fs_start+0xaaf/0xda0 fs/bcachefs/super.c:1213
bch2_fs_get_tree+0xb39/0x1520 fs/bcachefs/fs.c:2488
vfs_get_tree+0x92/0x2b0 fs/super.c:1751
fc_mount fs/namespace.c:1274 [inline]
do_new_mount_fc fs/namespace.c:3726 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3802
do_mount fs/namespace.c:4125 [inline]
__do_sys_mount fs/namespace.c:4324 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4301
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f439759034a
RSP: 002b:00007f4398331e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4398331ef0 RCX: 00007f439759034a
RDX: 00002000000000c0 RSI: 0000200000000040 RDI: 00007f4398331eb0
RBP: 00002000000000c0 R08: 00007f4398331ef0 R09: 0000000000808040
R10: 0000000000808040 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f4398331eb0 R14: 0000000000005904 R15: 00002000000002c0
INFO: task bch-reclaim/loo:21837 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-reclaim/loo state:D stack:22392 pid:21837 tgid:21837 ppid:2 task_flags:0x200840 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
__closure_sync+0x163/0x220 lib/closure.c:146
bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:315 [inline]
bch2_btree_update_start+0x18dc/0x1de0 fs/bcachefs/btree_update_interior.c:1293
bch2_btree_split_leaf+0x14b/0x8e0 fs/bcachefs/btree_update_interior.c:1921
bch2_trans_commit_error+0x1b7/0x1130 fs/bcachefs/btree_trans_commit.c:914
__bch2_trans_commit+0x1bb5/0x8880 fs/bcachefs/btree_trans_commit.c:1104
bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
bch2_btree_write_buffer_flush_locked+0x451f/0x4dd0 fs/bcachefs/btree_write_buffer.c:454
btree_write_buffer_flush_seq+0x18c7/0x1a40 fs/bcachefs/btree_write_buffer.c:572
bch2_btree_write_buffer_journal_flush+0x69/0xb0 fs/bcachefs/btree_write_buffer.c:588
journal_flush_pins+0x8e3/0xe90 fs/bcachefs/journal_reclaim.c:604
__bch2_journal_reclaim+0x910/0xed0 fs/bcachefs/journal_reclaim.c:732
bch2_journal_reclaim_thread+0x177/0x4f0 fs/bcachefs/journal_reclaim.c:774
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by kworker/u8:6/3493:
#0: ffff8880b8639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:644
4 locks held by kworker/u8:7/3520:
2 locks held by getty/5623:
#0: ffff8880327580a0 (&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
4 locks held by kworker/u8:20/11265:
#0: ffff888074f9d948 ((wq_completion)btree_node_rewrite){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff888074f9d948 ((wq_completion)btree_node_rewrite){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc9000ef57ba0 ((work_completion)(&a->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc9000ef57ba0 ((work_completion)(&a->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
#2: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#2: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#2: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220 fs/bcachefs/btree_iter.c:3299
#3: ffff8880852a6710 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0 fs/bcachefs/btree_update_interior.c:1211
2 locks held by syz.7.4472/21781:
#0: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#0: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#0: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220 fs/bcachefs/btree_iter.c:3299
#1: ffff8880852a6710 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0 fs/bcachefs/btree_update_interior.c:1211
4 locks held by bch-reclaim/loo/21837:
#0: ffff8880852caf68 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x16b/0x4f0 fs/bcachefs/journal_reclaim.c:773
#1: ffff888085284740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x18bd/0x1a40 fs/bcachefs/btree_write_buffer.c:571
#2: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#2: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#2: ffff888085284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220 fs/bcachefs/btree_iter.c:3299
#3: ffff8880852a6710 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0 fs/bcachefs/btree_update_interior.c:1211
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
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:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
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: 3520 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: bat_events batadv_mcast_mla_update
RIP: 0010:_raw_spin_unlock_irqrestore+0x32/0x110 kernel/locking/spinlock.c:193
Code: 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec 60 48 89 f3 49 89 fe 65 48 8b 05 7b e3 3d 07 48 89 44 24 48 48 c7 04 24 b3 8a b5 41 <48> c7 44 24 08 14 90 c3 8d 48 c7 44 24 10 80 9c 85 8b 49 89 e7 49
RSP: 0018:ffffc9000c217620 EFLAGS: 00000082
RAX: 01428b3faaab0600 RBX: 0000000000000802 RCX: ffff888030c2bc80
RDX: 0000000000000000 RSI: 0000000000000802 RDI: ffff8880b8725900
RBP: ffffc9000c2176b0 R08: ffffffff8fc3f337 R09: 1ffffffff1f87e66
R10: dffffc0000000000 R11: fffffbfff1f87e67 R12: ffff8880b8725900
R13: dffffc0000000000 R14: ffff8880b8725900 R15: 0000000000000802
FS: 0000000000000000(0000) GS:ffff888125ae8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555833225c8 CR3: 00000000304f0000 CR4: 00000000003526f0
Call Trace:
__mod_timer+0xb37/0xf30 kernel/time/timer.c:1139
queue_delayed_work_on+0x18b/0x280 kernel/workqueue.c:2561
queue_delayed_work include/linux/workqueue.h:684 [inline]
batadv_mcast_start_timer net/batman-adv/multicast.c:70 [inline]
batadv_mcast_mla_update+0x33da/0x3640 net/batman-adv/multicast.c:947
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245