INFO: task syz.2.77:6370 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.77 state:D stack:26952 pid:6370 tgid:6370 ppid:5845 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block+0x5ba/0x6d0 kernel/locking/rtmutex.c:1647
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x2b1/0x6e0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:536 [inline]
mutex_lock_nested+0x16a/0x1d0 kernel/locking/rtmutex_api.c:547
ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
ntfs_read_folio+0xba/0x200 fs/ntfs3/inode.c:726
filemap_read_folio+0x114/0x380 mm/filemap.c:2413
filemap_fault+0xb22/0x1210 mm/filemap.c:3537
__do_fault+0x135/0x390 mm/memory.c:5152
do_shared_fault mm/memory.c:5637 [inline]
do_fault mm/memory.c:5711 [inline]
do_pte_missing mm/memory.c:4234 [inline]
handle_pte_fault mm/memory.c:6052 [inline]
__handle_mm_fault mm/memory.c:6195 [inline]
handle_mm_fault+0x117f/0x3400 mm/memory.c:6364
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f4289b55171
RSP: 002b:00007ffc860a63c0 EFLAGS: 00010246
RAX: 0000200000000140 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00005555654993c8
RBP: 00007ffc860a64c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007f4289eb609c
R13: 00007f4289eb6090 R14: fffffffffffffffe R15: 00007ffc860a6510
INFO: task syz.2.77:6371 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.77 state:D stack:23720 pid:6371 tgid:6370 ppid:5845 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x81/0xe0 kernel/sched/core.c:7903
folio_wa[ 283.875343][ T38] folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1317
__folio_lock mm/filemap.c:1675 [inline]
folio_lock include/linux/pagemap.h:1133 [inline]
__filemap_get_folio+0x167/0xa40 mm/filemap.c:1929
attr_make_nonresident+0x87c/0xbe0 fs/ntfs3/attrib.c:294
attr_set_size_res fs/ntfs3/attrib.c:373 [inline]
attr_set_size+0x1f9f/0x2c70 fs/ntfs3/attrib.c:434
ntfs_set_size+0x164/0x200 fs/ntfs3/inode.c:861
ntfs_extend+0x1d9/0x970 fs/ntfs3/file.c:359
ntfs_setattr+0x2e8/0xbe0 fs/ntfs3/file.c:780
notify_change+0xb31/0xe60 fs/attr.c:552
do_truncate+0x1a4/0x220 fs/open.c:68
do_ftruncate+0x495/0x550 fs/open.c:195
do_sys_ftruncate fs/open.c:210 [inline]
__do_sys_ftruncate fs/open.c:215 [inline]
__se_sys_ftruncate fs/open.c:213 [inline]
__x64_sys_ftruncate+0x92/0xf0 fs/open.c:213
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4289c8ebe9
RSP: 002b:00007f4287ef6038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f4289eb5fa0 RCX: 00007f4289c8ebe9
RDX: 0000000000000000 RSI: 000000000000c17a RDI: 000000000000000c
RBP: 00007f4289d11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4289eb6038 R14: 00007f4289eb5fa0 R15: 00007ffc860a6298
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:2/43:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc90000b47bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc90000b47bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
#2: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303
5 locks held by kworker/u8:4/67:
3 locks held by kworker/1:2/992:
#0: ffff888019899938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019899938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc9000480fbc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000480fbc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
#2: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0x95/0xf30 net/wireless/reg.c:2483
4 locks held by kworker/u8:10/1439:
#0: ffff88801a6f4138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff88801a6f4138 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc9000567fbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000567fbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
#2: ffffffff8ecc51c0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800 net/core/net_namespace.c:658
#3: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xdc/0x890 net/core/dev.c:12719
2 locks held by dhcpcd/5501:
#0: ffff888023fc8908 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0xbd/0xe90 net/netlink/af_netlink.c:2269
#1: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#1: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200 net/core/rtnetlink.c:6814
2 locks held by getty/5600:
#0: ffff88823bf2c8a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/5838:
#0: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline]
#0: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x41/0x1c0 drivers/net/tun.c:3433
2 locks held by syz.2.77/6370:
#0: ffff88805af92478 (mapping.invalidate_lock#9){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#0: ffff88805af92478 (mapping.invalidate_lock#9){.+.+}-{4:4}, at: filemap_fault+0x876/0x1210 mm/filemap.c:3452
#1: ffff88805af91ff0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
#1: ffff88805af91ff0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_read_folio+0xba/0x200 fs/ntfs3/inode.c:726
4 locks held by syz.2.77/6371:
#0: ffff8880322b2488 (sb_writers#21){.+.+}-{0:0}, at: do_ftruncate+0x436/0x550 fs/open.c:194
#1: ffff88805af922a8 (&sb->s_type->i_mutex_key#26){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:874 [inline]
#1: ffff88805af922a8 (&sb->s_type->i_mutex_key#26){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
#2: ffff88805af91ff0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1113 [inline]
#2: ffff88805af91ff0 (&ni->ni_lock/5){+.+.}-{4:4}, at: ntfs_set_size+0x131/0x200 fs/ntfs3/inode.c:858
#3: ffff88805af92090 (&ni->file.run_lock#3){++++}-{4:4}, at: ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:859
4 locks held by kworker/u8:14/6630:
1 lock held by syz-executor/7649:
#0: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70 net/core/rtnetlink.c:4056
2 locks held by syz-executor/7753:
#0: ffffffff8ecc51c0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x304/0x4d0 net/core/net_namespace.c:566
#1: ffffffff8ecd20b8 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x80/0x210 net/ipv4/nexthop.c:3928
3 locks held by syz.1.265/7853:
#0: ffff888027fbe328 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x253/0x320 fs/file.c:1232
#1: ffff888028274488 (sb_writers#22){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3107 [inline]
#1: ffff888028274488 (sb_writers#22){.+.+}-{0:0}, at: vfs_write+0x217/0xb40 fs/read_write.c:682
#2: ffff88805af0ba28 (&sb->s_type->i_mutex_key#27){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#2: ffff88805af0ba28 (&sb->s_type->i_mutex_key#27){++++}-{4:4}, at: btrfs_inode_lock+0x51/0xe0 fs/btrfs/inode.c:362
4 locks held by syz.5.268/7886:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 67 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:__cq_empty kernel/locking/lockdep.c:1488 [inline]
RIP: 0010:__cq_dequeue kernel/locking/lockdep.c:1514 [inline]
RIP: 0010:__bfs kernel/locking/lockdep.c:1752 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain+0xe37/0x2140 kernel/locking/lockdep.c:3908
Code: 85 c0 74 26 48 8b 40 10 48 83 c0 30 49 8b 4d 00 48 89 8c 24 d0 00 00 00 48 39 c1 74 0d 4c 8b ac 24 d0 00 00 00 4d 85 ed 75 42 <44> 8b 3d d2 42 62 13 44 3b 3d cf 42 62 13 0f 84 d5 01 00 00 44 89
RSP: 0018:ffffc9000152e018 EFLAGS: 00000046
RAX: ffffffff92a0a470 RBX: 00000000000003cd RCX: ffffffff92a0a470
RDX: 0000000000000008 RSI: 00000000000003cd RDI: ffff88801bf11dc0
RBP: ffffffff929ea580 R08: ffffc9000152dfe0 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819c6180 R12: ffffffff958981d8
R13: ffffffff95844248 R14: ffff88801bf12a70 R15: 0000000000000340
FS: 0000000000000000(0000) GS:ffff8881269c2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000148000 CR3: 000000000d7a6000 CR4: 00000000003526f0
Call Trace:
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
_raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:636
raw_spin_rq_lock kernel/sched/sched.h:1519 [inline]
rq_lock kernel/sched/sched.h:1841 [inline]
ttwu_queue kernel/sched/core.c:4002 [inline]
try_to_wake_up+0x635/0x12b0 kernel/sched/core.c:4328
kick_pool+0x47d/0x640 kernel/workqueue.c:1283
__queue_work+0xd70/0x1010 kernel/workqueue.c:2340
queue_work_on+0x181/0x270 kernel/workqueue.c:2390
queue_work include/linux/workqueue.h:669 [inline]
loop_queue_work drivers/block/loop.c:856 [inline]
loop_queue_rq+0x9f0/0xb00 drivers/block/loop.c:1881
__blk_mq_issue_directly block/blk-mq.c:2695 [inline]
blk_mq_request_issue_directly+0x3c1/0x710 block/blk-mq.c:2782
blk_mq_issue_direct+0x2a0/0x660 block/blk-mq.c:2803
blk_mq_dispatch_queue_requests+0x6fe/0x800 block/blk-mq.c:2878
blk_mq_flush_plug_list+0x432/0x550 block/blk-mq.c:2961
__blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1220
blk_finish_plug block/blk-core.c:1247 [inline]
__submit_bio+0x2d3/0x5a0 block/blk-core.c:649
__submit_bio_noacct_mq block/blk-core.c:722 [inline]
submit_bio_noacct_nocheck+0x4f2/0xbb0 block/blk-core.c:751
btrfs_submit_chunk fs/btrfs/bio.c:759 [inline]
btrfs_submit_bbio+0xd4f/0x15f0 fs/btrfs/bio.c:788
submit_one_bio+0x11c/0x1d0 fs/btrfs/extent_io.c:130
submit_extent_folio+0xb11/0xe00 fs/btrfs/extent_io.c:-1
submit_one_sector fs/btrfs/extent_io.c:1582 [inline]
extent_writepage_io+0xbcd/0x1070 fs/btrfs/extent_io.c:1653
extent_writepage fs/btrfs/extent_io.c:1765 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2443 [inline]
btrfs_writepages+0x1416/0x22a0 fs/btrfs/extent_io.c:2576
do_writepages+0x32b/0x550 mm/page-writeback.c:2634
filemap_fdatawrite_wbc+0xe0/0x140 mm/filemap.c:386
start_delalloc_inodes+0x731/0xb30 fs/btrfs/inode.c:8719
btrfs_start_delalloc_roots+0x587/0x820 fs/btrfs/inode.c:8796
shrink_delalloc fs/btrfs/space-info.c:726 [inline]
flush_space+0x658/0xcd0 fs/btrfs/space-info.c:836
do_async_reclaim_metadata_space+0x144/0x390 fs/btrfs/space-info.c:1158
btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1226
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245