INFO: task syz.3.36:5546 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.3.36 state:D stack:24032 pid:5546 tgid:5530 ppid:5225 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
io_schedule+0x8d/0x110 kernel/sched/core.c:7552
folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309
folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189
truncate_inode_pages_range+0xafd/0xfc0 mm/truncate.c:398
bchfs_fallocate+0x2d1/0x730 fs/bcachefs/fs-io.c:718
bch2_fallocate_dispatch+0x3ac/0x540 fs/bcachefs/fs-io.c:771
vfs_fallocate+0x569/0x6e0 fs/open.c:333
do_vfs_ioctl+0x2583/0x2e40 fs/ioctl.c:886
__do_sys_ioctl fs/ioctl.c:905 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
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: 0033:0x7ff29e57dff9
RSP: 002b:00007ff29f351038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff29e736058 RCX: 00007ff29e57dff9
RDX: 0000000020000180 RSI: 0000000040305839 RDI: 0000000000000009
RBP: 00007ff29e5f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff29e736058 R15: 00007fff79eb1528
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
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/u8:3/53:
#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: ffffc90000be7d00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90000be7d00 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
2 locks held by getty/4977:
#0: ffff88803306a0a0 (&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
3 locks held by kworker/1:6/5269:
7 locks held by kworker/u8:9/5487:
1 lock held by syz.3.36/5531:
#0: ffff8880310ae420 (sb_writers#24){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#0: ffff8880310ae420 (sb_writers#24){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
2 locks held by syz.3.36/5546:
#0: ffff8880310ae420 (sb_writers#24){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#0: ffff8880310ae420 (sb_writers#24){.+.+}-{0:0}, at: vfs_fallocate+0x4fe/0x6e0 fs/open.c:332
#1: ffff88807f200148 (&sb->s_type->i_mutex_key#29){++++}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#1: ffff88807f200148 (&sb->s_type->i_mutex_key#29){++++}-{3:3}, at: bch2_fallocate_dispatch+0x1e2/0x540 fs/bcachefs/fs-io.c:762
2 locks held by bch-copygc/loop/5544:
2 locks held by kworker/u8:10/6439:
#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: ffffc900020cfd00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc900020cfd00 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
2 locks held by syz-executor/7134:
2 locks held by syz.2.279/7139:
1 lock held by syz.3.283/7145:
2 locks held by syz-executor/7149:
#0: ffffffff8fcb2450 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:490
#1: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#1: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
=============================================
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: 5544 Comm: bch-copygc/loop 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:separate_irq_context kernel/locking/lockdep.c:4672 [inline]
RIP: 0010:__lock_acquire+0xd60/0x2050 kernel/locking/lockdep.c:5183
Code: 8b 44 24 38 0f b6 04 38 84 c0 0f 85 3e 0c 00 00 41 8b 5d 00 48 85 db 74 58 83 fb 31 0f 83 2e 11 00 00 48 8d 04 9b 48 8b 0c 24 <48> 8d 5c c1 f8 48 89 d8 48 c1 e8 03 0f b6 04 38 84 c0 0f 85 6b 0d
RSP: 0018:ffffc900044c76b0 EFLAGS: 00000083
RAX: 0000000000000005 RBX: 0000000000000001 RCX: ffff88802d3ba8e0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: ffff88802d3ba908 R08: ffffffff9423f7c7 R09: 1ffffffff2847ef8
R10: dffffc0000000000 R11: fffffbfff2847ef9 R12: 0000000000000000
R13: ffff88802d3ba8d8 R14: e3a7f52acf58201d R15: ffff88802d3ba928
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555933f8608 CR3: 000000000e734000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
percpu_ref_put include/linux/percpu-refcount.h:351 [inline]
bch2_get_next_online_dev fs/bcachefs/sb-members.h:151 [inline]
bch2_copygc_wait_amount+0x1ed/0xcf0 fs/bcachefs/movinggc.c:274
bch2_copygc_thread+0x568/0xc20 fs/bcachefs/movinggc.c:360
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