INFO: task syz.1.8:5917 blocked for more than 144 seconds.
Not tainted 6.15.0-rc4-syzkaller-00052-g4f79eaa2ceac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.8 state:D stack:27176 pid:5917 tgid:5916 ppid:5807 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:406
sg_ioctl_common drivers/scsi/sg.c:1122 [inline]
sg_ioctl+0x9c9/0x2880 drivers/scsi/sg.c:1156
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25f1f8e969
RSP: 002b:00007f25f2d3f038 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f25f21b5fa0 RCX: 00007f25f1f8e969
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000009
RBP: 00007f25f2010ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f25f21b5fa0 R15: 00007ffc6fe53608
INFO: task syz.1.8:5920 blocked for more than 145 seconds.
Not tainted 6.15.0-rc4-syzkaller-00052-g4f79eaa2ceac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.8 state:D stack:28168 pid:5920 tgid:5916 ppid:5807 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
relay_close kernel/relay.c:759 [inline]
relay_close+0x36/0x5d0 kernel/relay.c:751
blk_trace_free+0x37/0x170 kernel/trace/blktrace.c:316
blk_trace_cleanup kernel/trace/blktrace.c:384 [inline]
__blk_trace_remove+0x7f/0x140 kernel/trace/blktrace.c:397
blk_trace_remove kernel/trace/blktrace.c:407 [inline]
blk_trace_ioctl+0x242/0x280 kernel/trace/blktrace.c:745
blkdev_common_ioctl+0x176a/0x2480 block/ioctl.c:629
blkdev_ioctl+0x1cb/0x6d0 block/ioctl.c:698
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25f1f8e969
RSP: 002b:00007f25efdf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f25f21b6160 RCX: 00007f25f1f8e969
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000007
RBP: 00007f25f2010ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f25f21b6160 R15: 00007ffc6fe53608
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8e3caaf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336
3 locks held by kworker/u8:1/13:
#0: ffff88801b481148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000127d18 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffffffff901243a8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:303
2 locks held by kworker/1:0/24:
#0: ffff88801b478d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc900001e7d18 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
1 lock held by khungtaskd/31:
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by getty/5567:
#0: ffff88803618a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900033232f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/5806:
#0: ffffffff901243a8 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:633 [inline]
#0: ffffffff901243a8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3390
#1: ffffffff8e3caaf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336
1 lock held by syz-executor/5818:
#0: ffffffff901243a8 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:633 [inline]
#0: ffffffff901243a8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3390
4 locks held by syz-executor/5822:
#0: ffff8880127d0d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481
#1: ffff8880127d0078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ae/0x11d0 net/bluetooth/hci_sync.c:5213
#2: ffffffff90393488 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2066 [inline]
#2: ffffffff90393488 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xbb/0x260 net/bluetooth/hci_conn.c:2701
#3: ffff888033183b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x80/0x730 net/bluetooth/l2cap_core.c:1761
1 lock held by syz.1.8/5917:
#0: ffff8880265f6a98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:406
2 locks held by syz.1.8/5920:
#0: ffff8880261d92d8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:406 [inline]
#0: ffff8880261d92d8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x23a/0x280 kernel/trace/blktrace.c:745
#1: ffffffff8e43ce68 (relay_channels_mutex){+.+.}-{4:4}, at: relay_close kernel/relay.c:759 [inline]
#1: ffffffff8e43ce68 (relay_channels_mutex){+.+.}-{4:4}, at: relay_close+0x36/0x5d0 kernel/relay.c:751
3 locks held by syz.1.8/5922:
3 locks held by syz-executor/7677:
#0: ffff8880227b8d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481
#1: ffff8880227b8078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ae/0x11d0 net/bluetooth/hci_sync.c:5213
#2: ffffffff90393488 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2066 [inline]
#2: ffffffff90393488 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xbb/0x260 net/bluetooth/hci_conn.c:2701
2 locks held by syz.4.372/7877:
#0: ffff888033aa0d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481
#1: ffff888033aa0078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ae/0x11d0 net/bluetooth/hci_sync.c:5213
2 locks held by dhcpcd-run-hook/7925:
#0: ffff8880b8439dd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:613 [inline]
#0: ffff8880b8439dd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:598
#1: ffff8880b8423c48 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987
1 lock held by sed/7930:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00052-g4f79eaa2ceac #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5922 Comm: syz.1.8 Not tainted 6.15.0-rc4-syzkaller-00052-g4f79eaa2ceac #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:preempt_count_sub+0x63/0x160 kernel/sched/core.c:5896
Code: 2a 19 85 c9 75 1b 65 8b 05 fa 14 1b 12 89 c2 81 e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 71 f7 db 65 01 1d dd 14 1b 12 <5b> c3 cc cc cc cc 90 e8 91 c7 44 03 85 c0 74 51 48 c7 c0 b0 2c 85
RSP: 0018:ffffc900046ff968 EFLAGS: 00000297
RAX: 0000000080000001 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8dbe0901 RDI: 0000000000000001
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9084fd17 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000021b2fe R14: 0000000000000000 R15: ffffc90022011000
FS: 00007f25ef9d36c0(0000) GS:ffff8881249e2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564113e0e300 CR3: 0000000029b72000 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:152 [inline]
_raw_spin_unlock_irqrestore+0x3b/0x80 kernel/locking/spinlock.c:194
__debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
debug_check_no_obj_freed+0x31f/0x600 lib/debugobjects.c:1129
remove_vm_area+0x1ae/0x3f0 mm/vmalloc.c:3241
vunmap mm/vmalloc.c:3411 [inline]
vunmap+0x55/0xa0 mm/vmalloc.c:3402
relay_destroy_buf+0x72/0x3e0 kernel/relay.c:199
relay_remove_buf kernel/relay.c:221 [inline]
kref_put include/linux/kref.h:65 [inline]
relay_close_buf+0x144/0x1a0 kernel/relay.c:429
relay_open+0x765/0xad0 kernel/relay.c:529
do_blk_trace_setup+0x503/0xb50 kernel/trace/blktrace.c:590
blk_trace_setup+0xed/0x1b0 kernel/trace/blktrace.c:632
sg_ioctl_common drivers/scsi/sg.c:1114 [inline]
sg_ioctl+0x7d7/0x2880 drivers/scsi/sg.c:1156
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25f1f8e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f25ef9d3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f25f21b6240 RCX: 00007f25f1f8e969
RDX: 0000200000000b40 RSI: 00000000c0481273 RDI: 0000000000000009
RBP: 00007f25f2010ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f25f21b6240 R15: 00007ffc6fe53608