INFO: task syz.2.3:5359 blocked for more than 143 seconds.
Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3 state:D stack:27424 pid:5359 tgid:5309 ppid:5226 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0x1843/0x4ae0 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6767
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
fdget_pos+0x24e/0x320 fs/file.c:1187
ksys_write+0x7e/0x2b0 fs/read_write.c:727
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff12277dff9
RSP: 002b:00007ff123613038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff122936058 RCX: 00007ff12277dff9
RDX: 0000000000000118 RSI: 0000000020000280 RDI: 0000000000000005
RBP: 00007ff1227f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007ff122936058 R15: 00007fffbda050c8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701
2 locks held by kworker/u8:3/52:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc90000bd7d00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90000bd7d00 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
2 locks held by kworker/u8:5/81:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc900015f7d00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc900015f7d00 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
3 locks held by kworker/0:2/938:
2 locks held by kworker/u8:6/2468:
#0: ffff88801d687148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801d687148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc9000885fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000885fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
2 locks held by getty/4978:
#0: ffff88814cf180a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5220:
#0: ffff8880562ce0e0 (&type->s_umount_key#102){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880562ce0e0 (&type->s_umount_key#102){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880562ce0e0 (&type->s_umount_key#102){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
2 locks held by syz.2.3/5310:
#0: ffff88807ba7beb8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1187
#1: ffff888028c90420 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#1: ffff888028c90420 (sb_writers#17){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
1 lock held by syz.2.3/5359:
#0: ffff88807ba7beb8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1187
3 locks held by bch-copygc/loop/5345:
3 locks held by syz.2.93/5769:
#0: ffff888028c900e0 (&type->s_umount_key#102){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888028c900e0 (&type->s_umount_key#102){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff88805ad84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88805ad84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88805ad84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3215
#2: ffff88805ada66d0 (&c->gc_lock){.+.+}-{3:3}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1202
3 locks held by bch-reclaim/loo/6189:
1 lock held by syz.2.176/6346:
#0: ffff888028c900e0 (&type->s_umount_key#102){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff888028c900e0 (&type->s_umount_key#102){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
1 lock held by syz.2.176/6347:
#0: ffff888028c900e0 (&type->s_umount_key#102){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff888028c900e0 (&type->s_umount_key#102){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
2 locks held by syz.0.217/6559:
#0: ffffffff8eec1ec8 (uuid_mutex){+.+.}-{3:3}, at: btrfs_get_tree_super fs/btrfs/super.c:1835 [inline]
#0: ffffffff8eec1ec8 (uuid_mutex){+.+.}-{3:3}, at: btrfs_get_tree+0x2dc/0x1920 fs/btrfs/super.c:2114
#1: ffffffff8e9f8f88 (lock#3){+.+.}-{3:3}, at: __lru_add_drain_all+0x66/0x560 mm/swap.c:843
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6189 Comm: bch-reclaim/loo Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__this_cpu_preempt_check+0x0/0x20 lib/smp_processor_id.c:65
Code: d2 fc ff e8 32 7d ff ff eb a8 e8 4b e0 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 89 fe 48 c7 c7 e0 1f 60 8c e9 bd fe ff ff 66 2e 0f
RSP: 0018:ffffc9000308f250 EFLAGS: 00000046
RAX: 0000000000000003 RBX: 0000000000000000 RCX: ffff88803257da00
RDX: 0000000000000000 RSI: ffffffff8e937d20 RDI: ffffffff8c0adb40
RBP: 0000000000000003 R08: ffffc9000308f487 R09: 0000000000000000
R10: ffffc9000308f460 R11: fffff52000611e91 R12: 0000000000000246
R13: ffff88803257da00 R14: 00000000ffffffff R15: ffffffff8e937d20
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5dfa0f000 CR3: 000000007c2b6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
lock_is_held_type+0x101/0x190 kernel/locking/lockdep.c:5895
lock_is_held include/linux/lockdep.h:249 [inline]
__might_resched+0xf4/0x780 kernel/sched/core.c:8593
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0xc1/0xd70 kernel/locking/mutex.c:752
bch2_btree_write_buffer_flush_locked+0x170/0x59f0 fs/bcachefs/btree_write_buffer.c:283
btree_write_buffer_flush_seq+0x1a43/0x1bc0 fs/bcachefs/btree_write_buffer.c:510
bch2_btree_write_buffer_journal_flush+0x4e/0x80 fs/bcachefs/btree_write_buffer.c:525
journal_flush_pins+0x5f7/0xb20 fs/bcachefs/journal_reclaim.c:565
__bch2_journal_reclaim+0x789/0xdc0 fs/bcachefs/journal_reclaim.c:698
bch2_journal_reclaim_thread+0x174/0x560 fs/bcachefs/journal_reclaim.c:740
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244