INFO: task syz-executor:10300 blocked for more than 143 seconds.
Not tainted 6.6.95-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21736 pid:10300 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x14e2/0x4580 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:192
sync_inodes_sb+0x1bc/0x9e0 fs/fs-writeback.c:2761
sync_filesystem+0x171/0x220 fs/sync.c:64
generic_shutdown_super+0x6f/0x2b0 fs/super.c:666
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
task_work_run+0x1ce/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x90b/0x23c0 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
__do_sys_exit_group kernel/exit.c:1035 [inline]
__se_sys_exit_group kernel/exit.c:1033 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7facc0f8e929
RSP: 002b:00007fff8e77b378 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007facc10109a9 RCX: 00007facc0f8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000027 R08: 00007fff8e779116 R09: 00007fff8e77c630
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8e77c630
R13: 00007facc1010925 R14: 0000555575d984a8 R15: 00007fff8e77e7f0
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cd2f760 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2f760 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2f760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:3/48:
#0: ffff88801a27e938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff88801a27e938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc90000b8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90000b8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
2 locks held by getty/5536:
#0: ffff8880320320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
2 locks held by kworker/1:8/10112:
#0: ffff888017872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc9000b47fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc9000b47fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
2 locks held by syz-executor/10300:
#0: ffff88807ad180e0 (&type->s_umount_key#72){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807ad180e0 (&type->s_umount_key#72){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807ad180e0 (&type->s_umount_key#72){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffff88814077c7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff88814077c7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x1a0/0x9e0 fs/fs-writeback.c:2759
1 lock held by segctord/11211:
5 locks held by kworker/u4:10/12663:
#0: ffff888017873938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017873938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc9000355fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc9000355fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#2: ffffffff8dfa1ed0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x136/0xb90 net/core/net_namespace.c:606
#3: ffffffff8dfaecc8 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_delete_nets+0xcc/0x360 net/ipv4/ip_tunnel.c:1166
#4: ffffffff8cd35738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#4: ffffffff8cd35738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x448/0x830 kernel/rcu/tree_exp.h:1004
1 lock held by syz-executor/12921:
#0: ffffffff8cd35738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#0: ffffffff8cd35738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x360/0x830 kernel/rcu/tree_exp.h:1004
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11211 Comm: segctord Not tainted 6.6.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:accumulate_sum kernel/sched/pelt.c:108 [inline]
RIP: 0010:___update_load_sum kernel/sched/pelt.c:226 [inline]
RIP: 0010:__update_load_avg_se+0x176/0xb90 kernel/sched/pelt.c:308
Code: 06 31 d2 83 7c 24 20 00 41 0f 95 c4 4c 89 b3 c0 00 00 00 49 0f 45 d5 4c 8d b3 dc 00 00 00 4d 89 f0 49 c1 e8 03 41 0f b6 04 30 <84> c0 48 89 54 24 08 48 89 fd 0f 85 a8 06 00 00 4c 89 74 24 10 41
RSP: 0018:ffffc900034feaa8 EFLAGS: 00000807
RAX: 0000000000000000 RBX: ffff888031889e80 RCX: 8eede8f323d57600
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: 0000000000000007
RBP: ffff888031889f40 R08: 1ffff110063113eb R09: 0000000000000000
R10: ffff888031889e98 R11: ffffed10063113d5 R12: 1ffff11006311301
R13: 0000000000000001 R14: ffff888031889f5c R15: ffff888031889e80
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000025000 CR3: 0000000021d0c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
update_load_avg+0x198/0x13d0 kernel/sched/fair.c:4752
put_prev_entity+0x6f/0x200 kernel/sched/fair.c:5507
put_prev_task_fair+0x4b/0x70 kernel/sched/fair.c:8571
put_prev_task kernel/sched/sched.h:2306 [inline]
put_prev_task_balance kernel/sched/core.c:5985 [inline]
pick_next_task kernel/sched/core.c:6120 [inline]
__schedule+0x27c7/0x4580 kernel/sched/core.c:6662
preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0010:lock_is_held_type+0x50/0x190 kernel/locking/lockdep.c:5818
Code: 3d 40 76 e3 03 00 0f 84 03 01 00 00 65 8b 05 4f 1f 9c 75 85 c0 0f 85 f4 00 00 00 65 48 8b 1d 47 4f 9d 75 83 bb dc 0a 00 00 00 <0f> 85 df 00 00 00 41 89 f7 49 89 fe 48 c7 04 24 00 00 00 00 9c 8f
RSP: 0018:ffffc900034fef90 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888031889e00 RCX: 0000000000000000
RDX: ffff888031889e00 RSI: 00000000ffffffff RDI: ffff88805145a3a8
RBP: 00000000ffffffff R08: dffffc0000000000 R09: 1ffffffff21b0aa4
R10: dffffc0000000000 R11: fffffbfff21b0aa5 R12: ffff88805145a3a8
R13: ffffc900034ff0b8 R14: ffffc900034ff0a0 R15: 1ffff9200069fe17
lock_is_held include/linux/lockdep.h:288 [inline]
xa_head include/linux/xarray.h:1200 [inline]
xas_start+0x1e5/0x770 lib/xarray.c:190
xas_load+0x2c/0x140 lib/xarray.c:237
filemap_get_entry+0x165/0x3c0 mm/filemap.c:1852
__filemap_get_folio+0x7c/0xbc0 mm/filemap.c:1897
pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99
find_or_create_page include/linux/pagemap.h:755 [inline]
grab_cache_page include/linux/pagemap.h:877 [inline]
nilfs_grab_buffer+0xb5/0x5a0 fs/nilfs2/page.c:56
nilfs_mdt_submit_block+0xb0/0x750 fs/nilfs2/mdt.c:120
nilfs_mdt_read_block+0x47/0x320 fs/nilfs2/mdt.c:175
nilfs_mdt_get_block+0x135/0xb20 fs/nilfs2/mdt.c:250
nilfs_sufile_get_segment_usage_block fs/nilfs2/sufile.c:92 [inline]
nilfs_sufile_set_segment_usage+0x13c/0x630 fs/nilfs2/sufile.c:556
nilfs_cancel_segusage fs/nilfs2/segment.c:1492 [inline]
nilfs_segctor_abort_construction+0x72d/0xdc0 fs/nilfs2/segment.c:1842
nilfs_segctor_do_construct+0x5f7e/0x6870 fs/nilfs2/segment.c:2154
nilfs_segctor_construct+0x17b/0x690 fs/nilfs2/segment.c:2454
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2562 [inline]
nilfs_segctor_thread+0x4f6/0x1000 fs/nilfs2/segment.c:2646
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293