======================================================
WARNING: possible circular locking dependency detected
5.10.217 #1 Not tainted
------------------------------------------------------
syz-executor.6/5683 is trying to acquire lock:
ffff88801b94cae8 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050
but task is already holding lock:
ffff88801b94cf40 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xef/0x1240 net/bluetooth/hci_core.c:1734
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&hdev->req_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:968 [inline]
__mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
hci_dev_do_close+0xef/0x1240 net/bluetooth/hci_core.c:1734
hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
vfs_write+0x29a/0xa70 fs/read_write.c:603
ksys_write+0x1f6/0x260 fs/read_write.c:658
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xcc
-> #2 (rfkill_global_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:968 [inline]
__mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
rfkill_register+0x36/0xa10 net/rfkill/core.c:1016
hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3774
__vhci_create_device+0x2c8/0x5c0 drivers/bluetooth/hci_vhci.c:129
vhci_create_device drivers/bluetooth/hci_vhci.c:153 [inline]
vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:310
process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
kthread+0x38f/0x470 kernel/kthread.c:313
ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299
-> #1 (&data->open_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:968 [inline]
__mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109
vhci_send_frame+0x63/0xa0 drivers/bluetooth/hci_vhci.c:71
hci_send_frame+0x1b9/0x320 net/bluetooth/hci_core.c:4061
hci_sched_acl_pkt net/bluetooth/hci_core.c:4586 [inline]
hci_sched_acl net/bluetooth/hci_core.c:4671 [inline]
hci_tx_work+0x10af/0x1660 net/bluetooth/hci_core.c:4742
process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282
worker_thread+0x61d/0x1310 kernel/workqueue.c:2428
kthread+0x38f/0x470 kernel/kthread.c:313
ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299
-> #0 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:2988 [inline]
check_prevs_add kernel/locking/lockdep.c:3113 [inline]
validate_chain kernel/locking/lockdep.c:3729 [inline]
__lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955
lock_acquire kernel/locking/lockdep.c:5566 [inline]
lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531
__flush_work+0x105/0xa90 kernel/workqueue.c:3053
hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745
hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
vfs_write+0x29a/0xa70 fs/read_write.c:603
ksys_write+0x1f6/0x260 fs/read_write.c:658
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xcc
other info that might help us debug this:
Chain exists of:
(work_completion)(&hdev->tx_work) --> rfkill_global_mutex --> &hdev->req_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&hdev->req_lock);
lock(rfkill_global_mutex);
lock(&hdev->req_lock);
lock((work_completion)(&hdev->tx_work));
*** DEADLOCK ***
2 locks held by syz-executor.6/5683:
#0: ffffffff8561afa8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232
#1: ffff88801b94cf40 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xef/0x1240 net/bluetooth/hci_core.c:1734
stack backtrace:
CPU: 0 PID: 5683 Comm: syz-executor.6 Not tainted 5.10.217 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x167 lib/dump_stack.c:118
check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2123
check_prev_add kernel/locking/lockdep.c:2988 [inline]
check_prevs_add kernel/locking/lockdep.c:3113 [inline]
validate_chain kernel/locking/lockdep.c:3729 [inline]
__lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955
lock_acquire kernel/locking/lockdep.c:5566 [inline]
lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531
__flush_work+0x105/0xa90 kernel/workqueue.c:3053
hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745
hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223
rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341
rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240
vfs_write+0x29a/0xa70 fs/read_write.c:603
ksys_write+0x1f6/0x260 fs/read_write.c:658
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xcc
RIP: 0033:0x7f96f0319b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f96ed88f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f96f042cf60 RCX: 00007f96f0319b19
RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007f96f0373f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff880acc5f R14: 00007f96ed88f300 R15: 0000000000022000
kauditd_printk_skb: 33 callbacks suppressed
audit: type=1326 audit(1716591283.142:500): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.160:501): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=257 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.167:502): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.172:503): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.172:504): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.172:505): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.172:506): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.172:507): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=317 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.173:508): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
audit: type=1326 audit(1716591283.173:509): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5671 comm="syz-executor.5" exe="/syz-executor.5" sig=0 arch=c000003e syscall=261 compat=0 ip=0x7f943cf1cb19 code=0x7ffc0000
netlink: 112 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 112 bytes leftover after parsing attributes in process `syz-executor.2'.
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
print_req_error: 22 callbacks suppressed
blk_update_request: I/O error, dev sr0, sector 2096896 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096897 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096898 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096899 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096900 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096901 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096902 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
blk_update_request: I/O error, dev sr0, sector 2096903 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
blk_update_request: I/O error, dev loop4, sector 2096896 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
buffer_io_error: 6 callbacks suppressed
Buffer I/O error on dev loop4, logical block 2096896, async page read
blk_update_request: I/O error, dev loop4, sector 2096897 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop4, logical block 2096897, async page read
Buffer I/O error on dev loop4, logical block 2096898, async page read
Buffer I/O error on dev loop4, logical block 2096899, async page read
Buffer I/O error on dev loop4, logical block 2096900, async page read
Buffer I/O error on dev loop4, logical block 2096901, async page read
Buffer I/O error on dev loop4, logical block 2096902, async page read
Buffer I/O error on dev loop4, logical block 2096903, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
Buffer I/O error on dev loop4, logical block 2096896, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
Buffer I/O error on dev loop4, logical block 2096897, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer