INFO: task syz-executor.4:26035 blocked for more than 143 seconds.
Not tainted 6.8.0-rc4-next-20240214-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:20984 pid:26035 tgid:26035 ppid:1 flags:0x00000006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x17df/0x4a40 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6804 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6819
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6876
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334
call_write_iter include/linux/fs.h:2117 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa84/0xcb0 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fbf2087caef
RSP: 002b:00007ffca60d9a50 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fbf2087caef
RDX: 0000000000000001 RSI: 00007ffca60d9aa0 RDI: 0000000000000005
RBP: 00007fbf208ca021 R08: 0000000000000000 R09: 00007ffca60d98a7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffca60d9aa0 R14: 00007fbf214d4620 R15: 0000000000000003
Showing all locks held in the system:
5 locks held by kworker/u8:0/10:
#0: ffff888015ad5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
#0: ffff888015ad5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
#1: ffffc900000f7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
#1: ffffc900000f7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
#2: ffffffff8f37aed0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:591
#3: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: cleanup_net+0x6af/0xcc0 net/core/net_namespace.c:627
#4: ffffffff8e136800 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x550 kernel/rcu/tree.c:4073
1 lock held by khungtaskd/29:
#0: ffffffff8e1315a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e1315a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e1315a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4816:
#0: ffff88802a1130a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by kworker/u8:4/23745:
#0: ffff8880299b2148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
#0: ffff8880299b2148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
#1: ffffc90012e7fd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
#1: ffffc90012e7fd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
#2: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4689
3 locks held by kworker/1:6/23287:
#0: ffff888014c7c948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
#0: ffff888014c7c948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
#1: ffffc90013e07d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
#1: ffffc90013e07d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
#2: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:75
1 lock held by syz-executor.2/25956:
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:696 [inline]
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3504
4 locks held by kworker/u9:0/25959:
7 locks held by syz-executor.3/25974:
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2862 [inline]
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff888088ac3c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff888022e494b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecc1b48 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
#4: ffff888089d340e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
#4: ffff888089d340e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
#4: ffff888089d340e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292
#5: ffff888079aa6250 (&devlink->lock_key){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672
#6: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x40/0x160 drivers/net/netdevsim/netdev.c:417
4 locks held by syz-executor.4/26035:
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2862 [inline]
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff8880a562e088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff888022e494b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecc1b48 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.2/26579:
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2862 [inline]
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff8880a7adc488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff888022e494b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecc1b48 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.3/26617:
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2862 [inline]
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff8880a26a3888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff888022e494b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecc1b48 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.4/26819:
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2862 [inline]
#0: ffff888078542420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
#1: ffff88809fd83c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
#2: ffff888022e494b8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
#3: ffffffff8ecc1b48 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
1 lock held by syz-executor.1/27572:
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606
1 lock held by syz-executor.2/27580:
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606
1 lock held by syz-executor.3/27587:
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606
1 lock held by syz-executor.4/27642:
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606
1 lock held by syz-executor.1/27686:
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8f387548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6606
5 locks held by syz-executor.0/27868:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc4-next-20240214-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xfb0/0xff0 kernel/hung_task.c:380
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25959 Comm: kworker/u9:0 Not tainted 6.8.0-rc4-next-20240214-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: hci2 hci_conn_timeout
RIP: 0010:visit_lock_entry kernel/locking/lockdep.c:1520 [inline]
RIP: 0010:__bfs kernel/locking/lockdep.c:1800 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1844 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2804 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3138 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3253 [inline]
RIP: 0010:validate_chain+0x1fc0/0x58e0 kernel/locking/lockdep.c:3869
Code: 41 b4 01 eb 0c 4d 8b 3f 4d 39 f7 0f 84 5d fc ff ff 49 8d 5f 30 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 b6 ce 84 00 4c 89 2b 41 f6 c4 01 74 7f 8b 1d 8b
RSP: 0018:ffffc9000ed8f280 EFLAGS: 00000046
RAX: 1ffffffff27bb65f RBX: ffffffff93ddb2f8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff929d57d0
RBP: ffffc9000ed8f580 R08: ffffffff92cc34b7 R09: 1ffffffff2598696
R10: dffffc0000000000 R11: fffffbfff2598697 R12: 0000000000000000
R13: ffffffff93e41c48 R14: ffffffff929d57a0 R15: ffffffff93ddb2c8
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd512572c98 CR3: 000000002b0aa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
raw_spin_rq_lock kernel/sched/sched.h:1385 [inline]
rq_lock kernel/sched/sched.h:1699 [inline]
ttwu_queue kernel/sched/core.c:4046 [inline]
try_to_wake_up+0x7d3/0x1470 kernel/sched/core.c:4369
kick_pool+0x399/0x4b0 kernel/workqueue.c:1252
__queue_work+0xc20/0xec0 kernel/workqueue.c:2297
queue_work_on+0x14f/0x250 kernel/workqueue.c:2331
queue_work include/linux/workqueue.h:595 [inline]
hci_cmd_sync_submit+0x2c3/0x2f0 net/bluetooth/hci_sync.c:647
process_one_work kernel/workqueue.c:3146 [inline]
process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226
worker_thread+0x86d/0xd70 kernel/workqueue.c:3307
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242