INFO: task syz-executor.3:18465 blocked for more than 143 seconds. Not tainted 5.8.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28384 18465 7219 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 hci_dev_open+0x1d5/0x350 net/bluetooth/hci_core.c:1670 hci_sock_ioctl+0x582/0x800 net/bluetooth/hci_sock.c:1026 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1048 sock_ioctl+0x3b8/0x730 net/socket.c:1199 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f6ce6657c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f4d00 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000400448c9 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006c0 R14: 00000000004c9b95 R15: 00007f6ce66586d4 INFO: task syz-executor.4:18476 blocked for more than 143 seconds. Not tainted 5.8.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28384 18476 7364 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 hci_dev_open+0x1d5/0x350 net/bluetooth/hci_core.c:1670 hci_sock_ioctl+0x582/0x800 net/bluetooth/hci_sock.c:1026 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1048 sock_ioctl+0x3b8/0x730 net/socket.c:1199 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f3af6e0ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f4d00 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000400448c9 RDI: 0000000000000007 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006c0 R14: 00000000004c9b95 R15: 00007f3af6e0b6d4 INFO: task syz-executor.5:18490 blocked for more than 143 seconds. Not tainted 5.8.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28384 18490 7399 0x00000000 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 hci_dev_open+0x1d5/0x350 net/bluetooth/hci_core.c:1670 hci_sock_ioctl+0x582/0x800 net/bluetooth/hci_sock.c:1026 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1048 sock_ioctl+0x3b8/0x730 net/socket.c:1199 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007fa3ae9b3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f4d00 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000400448c9 RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006c0 R14: 00000000004c9b95 R15: 00007fa3ae9b46d4 INFO: task syz-executor.4:18503 blocked for more than 144 seconds. Not tainted 5.8.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28384 18503 7364 0x00000004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 hci_dev_open+0x1d5/0x350 net/bluetooth/hci_core.c:1670 hci_sock_ioctl+0x582/0x800 net/bluetooth/hci_sock.c:1026 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1048 sock_ioctl+0x3b8/0x730 net/socket.c:1199 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f3af6e0ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f4d00 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000400448c9 RDI: 0000000000000007 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006c0 R14: 00000000004c9b95 R15: 00007f3af6e0b6d4 INFO: task syz-executor.5:18518 blocked for more than 144 seconds. Not tainted 5.8.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28384 18518 7399 0x00000000 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 hci_dev_open+0x1d5/0x350 net/bluetooth/hci_core.c:1670 hci_sock_ioctl+0x582/0x800 net/bluetooth/hci_sock.c:1026 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1048 sock_ioctl+0x3b8/0x730 net/socket.c:1199 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007fa3ae9b3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f4d00 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000400448c9 RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006c0 R14: 00000000004c9b95 R15: 00007fa3ae9b46d4 Showing all locks held in the system: 1 lock held by khungtaskd/1144: #0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6572: #0: ffff88809531c370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by agetty/6773: #0: ffff888094d12098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000f942e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.5/18455: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.3/18465: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.4/18476: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18490: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.4/18503: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18518: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18563: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.4/18583: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18594: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.4/18597: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18618: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18707: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.3/18717: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18788: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.3/18933: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.5/18938: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 1 lock held by syz-executor.4/18999: #0: ffff88808b478f18 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0x9a/0x1a20 net/bluetooth/hci_core.c:1421 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1144 Comm: khungtaskd Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3919 Comm: systemd-journal Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x22b/0x56e0 kernel/locking/lockdep.c:4314 Code: 83 7c 24 18 00 0f 85 e6 0c 00 00 48 8b 44 24 28 0f b7 4c 24 08 4a 8d 2c 10 48 8d 45 20 66 81 e1 ff 1f 48 89 c2 48 89 44 24 30 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 84 d2 74 09 RSP: 0018:ffffc900015d7a50 EFLAGS: 00000006 RAX: ffff888093ac8b18 RBX: 0000000000000001 RCX: 00000000000004c3 RDX: ffff888093ac8b18 RSI: 1ffff1101275915e RDI: ffff888093ac8af0 RBP: ffff888093ac8af8 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000028 R11: 0000000000000001 R12: ffff888093ac8200 R13: 0000000000000000 R14: ffff888093469558 R15: 0000000000000000 FS: 00007fc5a10c18c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc59e5ae000 CR3: 000000009344b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:311 ep_scan_ready_list+0x29b/0x880 fs/eventpoll.c:716 ep_send_events fs/eventpoll.c:1788 [inline] ep_poll fs/eventpoll.c:1944 [inline] do_epoll_wait+0xac4/0x1190 fs/eventpoll.c:2333 __do_sys_epoll_wait fs/eventpoll.c:2343 [inline] __se_sys_epoll_wait fs/eventpoll.c:2340 [inline] __x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2340 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc5a038b2e3 Code: Bad RIP value. RSP: 002b:00007fff8fb95d38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000564f1220a1e0 RCX: 00007fc5a038b2e3 RDX: 0000000000000013 RSI: 00007fff8fb95d40 RDI: 0000000000000008 RBP: 00007fff8fb95f30 R08: 0000564f12215dc0 R09: 00007fff8fbef080 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8fb95d40 R13: 0000000000000001 R14: 0000000000000000 R15: 0005aa31e2816948