INFO: task syz-fuzzer:7984 blocked for more than 140 seconds.
Not tainted 4.14.302-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-fuzzer D27400 7984 7975 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2811 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3387
schedule+0x8d/0x1b0 kernel/sched/core.c:3431
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:66 [inline]
down_read+0x44/0x80 kernel/locking/rwsem.c:26
__do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378
page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1126
RIP: e87000:0xc0000824e0
RSP: e7ec90:000000c0000abe70 EFLAGS: 00000002
INFO: task syz-fuzzer:7994 blocked for more than 140 seconds.
Not tainted 4.14.302-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-fuzzer D29056 7994 7975 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2811 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3387
schedule+0x8d/0x1b0 kernel/sched/core.c:3431
__rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
__down_read arch/x86/include/asm/rwsem.h:66 [inline]
down_read+0x44/0x80 kernel/locking/rwsem.c:26
__do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378
page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1126
RIP: fc1c00:0xc000083ba0
RSP: 17d30b0:000000c000d17e70 EFLAGS: 00000010
INFO: task syz-executor.1:11322 blocked for more than 140 seconds.
Not tainted 4.14.302-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D26744 11322 8002 0x80000006
Call Trace:
context_switch kernel/sched/core.c:2811 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3387
schedule+0x8d/0x1b0 kernel/sched/core.c:3431
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460
device_del+0x642/0xa80 drivers/base/core.c:2097
hci_conn_del_sysfs+0xca/0x160 net/bluetooth/hci_sysfs.c:81
hci_conn_cleanup+0x216/0x500 net/bluetooth/hci_conn.c:128
hci_conn_del+0x253/0x6f0 net/bluetooth/hci_conn.c:611
hci_conn_hash_flush+0x19c/0x260 net/bluetooth/hci_conn.c:1394
hci_dev_do_close+0x57d/0xd80 net/bluetooth/hci_core.c:1641
hci_unregister_dev+0x143/0x420 net/bluetooth/hci_core.c:3209
vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354
__fput+0x25f/0x7a0 fs/file_table.c:210
task_work_run+0x11f/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xa44/0x2850 kernel/exit.c:868
do_group_exit+0x100/0x2e0 kernel/exit.c:965
get_signal+0x38d/0x1ca0 kernel/signal.c:2412
do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792
exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f649ef2a0d9
RSP: 002b:00007f649d49c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: 0000000000000007 RBX: 00007f649f049f80 RCX: 00007f649ef2a0d9
RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100
RBP: 00007f649ef85ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff14f35cf R14: 00007f649d49c300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/1533:
#0: (tasklist_lock){.+.+}, at: [<ffffffff8702b3a4>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by in:imklog/7692:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff818d8f8b>] __fdget_pos+0x1fb/0x2b0 fs/file.c:819
1 lock held by syz-fuzzer/7984:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff812428a8>] __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378
1 lock held by syz-fuzzer/7994:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff812428a8>] __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378
3 locks held by syz-executor.4/11304:
#0: (&hdev->req_lock){+.+.}, at: [<ffffffff8661cb38>] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589
#1: (&hdev->lock){+.+.}, at: [<ffffffff8661ccf4>] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628
#2: (uevent_sock_mutex){+.+.}, at: [<ffffffff86fece05>] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460
3 locks held by syz-executor.1/11322:
#0: (&hdev->req_lock){+.+.}, at: [<ffffffff8661cb38>] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589
#1: (&hdev->lock){+.+.}, at: [<ffffffff8661ccf4>] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628
#2: (uevent_sock_mutex){+.+.}, at: [<ffffffff86fece05>] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: bat_events batadv_nc_worker
task: ffff8880b5fec140 task.stack: ffff8880b5ff8000
RIP: 0010:skb_release_head_state+0x0/0x250 net/core/skbuff.c:620
RSP: 0018:ffff8880ba507bb8 EFLAGS: 00000206
RAX: ffff8880b5fec140 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000100 RSI: 00000000ffffffff RDI: ffff8881fb19ae40
RBP: ffff8881fb19ae40 R08: ffffffff8b9d8c10 R09: 00000000000426c1
R10: ffff8880b5feca40 R11: ffff8880b5fec140 R12: ffff8881fb19ba48
R13: 0000000000000005 R14: 0000000000000000 R15: ffff8881fb19aed0
FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a8e0f5a268 CR3: 00000000ab8c0000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
skb_release_all net/core/skbuff.c:638 [inline]
__kfree_skb net/core/skbuff.c:654 [inline]
consume_skb+0xa7/0x380 net/core/skbuff.c:714
vcan_tx+0x461/0x940 drivers/net/can/vcan.c:113
__netdev_start_xmit include/linux/netdevice.h:4054 [inline]
netdev_start_xmit include/linux/netdevice.h:4063 [inline]
xmit_one net/core/dev.c:3005 [inline]
dev_hard_start_xmit+0x188/0x890 net/core/dev.c:3021
__dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521
can_send+0x3b4/0x7c0 net/can/af_can.c:297
bcm_can_tx+0x475/0x690 net/can/bcm.c:314
bcm_tx_timeout_tsklet+0x179/0x320 net/can/bcm.c:428
tasklet_action+0x195/0x340 kernel/softirq.c:513
__do_softirq+0x24d/0x9ff kernel/softirq.c:288
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1019
</IRQ>
do_softirq.part.0+0x154/0x1b0 kernel/softirq.c:332
do_softirq kernel/softirq.c:324 [inline]
__local_bh_enable_ip+0x12b/0x170 kernel/softirq.c:185
spin_unlock_bh include/linux/spinlock.h:362 [inline]
batadv_nc_purge_paths+0x20c/0x300 net/batman-adv/network-coding.c:481
batadv_nc_worker+0x660/0xc50 net/batman-adv/network-coding.c:731
process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
Code: ff ff 48 89 04 24 e8 b0 73 bf fb 48 8b 04 24 e9 9e fe ff ff 4c 89 ef e8 7f 74 bf fb eb 83 e8 c8 71 bf fb e9 0a ff ff ff 0f 1f 00 <41> 54 55 53 48 89 fb e8 84 b2 95 fb 4c 8d 63 58 48 b8 00 00 00