INFO: task syz.1.2337:13528 blocked for more than 143 seconds.
Not tainted 6.14.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2337 state:D stack:28016 pid:13528 tgid:13527 ppid:5822 task_flags:0x400740 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
coredump_wait fs/coredump.c:419 [inline]
do_coredump+0x86f/0x4410 fs/coredump.c:576
get_signal+0x230b/0x26c0 kernel/signal.c:3021
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f49a384e750
RSP: 002b:00007f49a48963f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007f49a3ba5fa8 RCX: 00007f49a398d169
RDX: 00007f49a4896400 RSI: 00007f49a4896530 RDI: 000000000000000b
RBP: 00007f49a3ba5fa0 R08: 00007f49a4898000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f49a3ba5fac
R13: 0000000000000000 R14: 00007ffe22527410 R15: 00007ffe225274f8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e1bd0c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e1bd0c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1bd0c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
2 locks held by getty/5587:
#0: ffff88814d4740a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900033332f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:4/5870:
#0: ffff88801b078d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc90003ff7d18 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff8880621f9240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1bb/0x26d0 drivers/net/netdevsim/fib.c:1490
2 locks held by kworker/0:6/5874:
#0: ffff88801b078d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc90004037d18 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
3 locks held by kworker/1:5/5904:
#0: ffff888140472948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc900032afd18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff88814535a190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#2: ffff88814535a190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c1/0x4e10 drivers/usb/core/hub.c:5861
3 locks held by syz-executor/15597:
#0: ffff88805c77cd80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:480
#1: ffff88805c77c078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ab/0x11a0 net/bluetooth/hci_sync.c:5185
#2: ffff888068f52338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7f/0x730 net/bluetooth/l2cap_core.c:1761
3 locks held by syz-executor/15942:
#0: ffff888051114d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:480
#1: ffff888051114078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ab/0x11a0 net/bluetooth/hci_sync.c:5185
#2: ffff888071305338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7f/0x730 net/bluetooth/l2cap_core.c:1761
3 locks held by syz.5.3014/16044:
#0: ffff888030e04d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:480
#1: ffff888030e04078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ab/0x11a0 net/bluetooth/hci_sync.c:5185
#2: ffff888036b92338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7f/0x730 net/bluetooth/l2cap_core.c:1761
3 locks held by syz.3.3016/16058:
#0: ffff88808cfb0d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:480
#1: ffff88808cfb0078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ab/0x11a0 net/bluetooth/hci_sync.c:5185
#2: ffff8881412d7338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7f/0x730 net/bluetooth/l2cap_core.c:1761
1 lock held by syz.0.3017/16061:
#0: ffffffff8e1c8538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:334
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf62/0x12b0 kernel/hung_task.c:399
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16061 Comm: syz.0.3017 Not tainted 6.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x4dd/0x6f0 kernel/locking/lockdep.c:5862
Code: 00 00 49 8b 7e 08 4c 89 e6 48 8b 54 24 08 e8 3a 50 fe ff 65 ff 0d 7b 23 6d 7e 0f 85 a7 fb ff ff e8 78 3f 95 ff e9 a4 fb ff ff 4e df 08 00 84 c0 0f 85 cd fb ff ff 80 3d eb 2f b4 0e 00 0f 85
RSP: 0018:ffffc9000471eeb0 EFLAGS: 00000047
RAX: 0000000000000001 RBX: 1ffff920008e3dd8 RCX: ffffffff8196b1a9
RDX: fffffbfff20c4c63 RSI: 0000000000000008 RDI: ffffffff90626310
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff20c4c62
R10: ffffffff90626317 R11: 0000000000000003 R12: ffffffff9aa934c8
R13: ffff888063d07718 R14: 1ffff920008e3df6 R15: ffffffff9aa934a8
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f42824d7d60 CR3: 000000002fca0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
_raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194
debug_object_activate+0x2e6/0x4a0 lib/debugobjects.c:836
debug_rcu_head_queue kernel/rcu/rcu.h:224 [inline]
__call_rcu_common.constprop.0+0x2c/0x870 kernel/rcu/tree.c:3050
xa_node_free lib/xarray.c:260 [inline]
xas_delete_node lib/xarray.c:502 [inline]
update_node lib/xarray.c:766 [inline]
xas_store+0xc8c/0x1930 lib/xarray.c:851
page_cache_delete+0x32d/0x520 mm/filemap.c:141
__filemap_remove_folio mm/filemap.c:224 [inline]
filemap_remove_folio+0xfe/0x250 mm/filemap.c:256
truncate_inode_folio+0x49/0x70 mm/truncate.c:162
shmem_undo_range+0x36e/0x1170 mm/shmem.c:1108
shmem_truncate_range mm/shmem.c:1224 [inline]
shmem_evict_inode+0x3a3/0xba0 mm/shmem.c:1352
evict+0x409/0x960 fs/inode.c:796
iput_final fs/inode.c:1946 [inline]
iput fs/inode.c:1972 [inline]
iput+0x52a/0x890 fs/inode.c:1958
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:440
__dentry_kill+0x1d0/0x600 fs/dcache.c:643
shrink_kill fs/dcache.c:1088 [inline]
shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1115
shrink_dcache_parent+0xe2/0x530 fs/dcache.c:1549
do_one_tree fs/dcache.c:1578 [inline]
shrink_dcache_for_umount+0xa1/0x3e0 fs/dcache.c:1595
generic_shutdown_super+0x6c/0x390 fs/super.c:620
kill_anon_super fs/super.c:1237 [inline]
kill_litter_super+0x70/0xa0 fs/super.c:1247
deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
deactivate_super+0xde/0x100 fs/super.c:506
cleanup_mnt+0x222/0x450 fs/namespace.c:1413
task_work_run+0x14e/0x250 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xad8/0x2d70 kernel/exit.c:938
do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
get_signal+0x24ed/0x26c0 kernel/signal.c:3036
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9698d8d169
Code: Unable to access opcode bytes at 0x7f9698d8d13f.
RSP: 002b:00007f9699b99038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f9698fa6080 RCX: 00007f9698d8d169
RDX: 0000000000010106 RSI: 00004000000000c0 RDI: 0000000000000006
RBP: 00007f9698e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9698fa6080 R15: 00007ffef64b2838