INFO: task syz.3.924:9473 blocked for more than 143 seconds.
Not tainted 6.13.0-syzkaller-08265-g9c5968db9e62 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.924 state:D stack:23440 pid:9473 tgid:9470 ppid:5843 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5377 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6764
__schedule_loop kernel/sched/core.c:6841 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6856
io_schedule+0x8d/0x110 kernel/sched/core.c:7689
folio_wait_bit_common+0x839/0xee0 mm/filemap.c:1318
folio_lock include/linux/pagemap.h:1163 [inline]
migrate_folio_unmap mm/migrate.c:1242 [inline]
migrate_pages_batch+0x1538/0x30b0 mm/migrate.c:1866
migrate_pages_sync mm/migrate.c:2016 [inline]
migrate_pages+0x2561/0x34a0 mm/migrate.c:2098
compact_zone+0x3425/0x4b00 mm/compaction.c:2644
compact_node mm/compaction.c:2913 [inline]
compact_nodes mm/compaction.c:2935 [inline]
sysctl_compaction_handler+0x496/0x990 mm/compaction.c:2986
proc_sys_call_handler+0x5ee/0x920 fs/proc/proc_sysctl.c:601
iter_file_splice_write+0xbfc/0x1510 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11d/0x220 fs/splice.c:1164
splice_direct_to_actor+0x588/0xc80 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x289/0x3e0 fs/splice.c:1233
do_sendfile+0x564/0x8a0 fs/read_write.c:1363
__do_sys_sendfile64 fs/read_write.c:1418 [inline]
__se_sys_sendfile64+0x100/0x1e0 fs/read_write.c:1410
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: 0033:0x7f54fc58cda9
RSP: 002b:00007f54fd409038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f54fc7a5fa0 RCX: 00007f54fc58cda9
RDX: 00000000200000c0 RSI: 0000000000000007 RDI: 0000000000000009
RBP: 00007f54fc60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f54fc7a5fa0 R15: 00007ffc814a0db8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e939ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e939ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e939ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by getty/5583:
#0: ffff88803151c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by udevd/5981:
#0: ffff8880259174c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:903
3 locks held by kworker/u8:14/8282:
3 locks held by kworker/u8:15/8285:
#0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317
#1: ffffc9000b377c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000b377c60 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317
#2: ffffffff8fcc3b08 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:285
1 lock held by syz.3.924/9473:
#0: ffff88807bdf8420 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x220 fs/splice.c:1163
2 locks held by syz.4.1267/10745:
#0: ffffffff8fcc3b08 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:702 [inline]
#0: ffffffff8fcc3b08 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3521
#1: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline]
#1: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:996
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-syzkaller-08265-g9c5968db9e62 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
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: 8282 Comm: kworker/u8:14 Not tainted 6.13.0-syzkaller-08265-g9c5968db9e62 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_unbound fsnotify_connector_destroy_workfn
RIP: 0010:kthread_data+0x83/0xd0 kernel/kthread.c:255
Code: 4c 89 e0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 e7 e8 41 76 9b 00 49 8b 1c 24 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 23 76 9b 00 48 8b 03 5b 41 5c 41 5e 41 5f 5d e9
RSP: 0018:ffffc9000b3476f8 EFLAGS: 00000246
RAX: 1ffff1100b685b84 RBX: ffff88805b42dc20 RCX: ffff888028ce8000
RDX: 0000000000000000 RSI: 0000000000200000 RDI: 0000000000000000
RBP: 0000000004208160 R08: ffffffff818a8b49 R09: 1ffffffff285f721
R10: dffffc0000000000 R11: fffffbfff285f722 R12: ffff888028ce86b0
R13: 1ffff92001668eec R14: ffff888028ce802c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12f6779178 CR3: 00000000613ac000 CR4: 0000000000350ef0
Call Trace:
wq_worker_running+0x28/0x200 kernel/workqueue.c:1387
schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
__synchronize_srcu+0x357/0x400 kernel/rcu/srcutree.c:1433
fsnotify_connector_destroy_workfn+0x44/0xb0 fs/notify/mark.c:318
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317
worker_thread+0x870/0xd30 kernel/workqueue.c:3398
kthread+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244