======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 Not tainted
------------------------------------------------------
syz.1.7695/9020 is trying to acquire lock:
ffff888027c93058 (sk_lock-AF_SMC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
ffff888027c93058 (sk_lock-AF_SMC){+.+.}-{0:0}, at: smc_shutdown+0x65/0x7f0 net/smc/af_smc.c:2930
but task is already holding lock:
ffff88807491c870 (&nsock->tx_lock){+.+.}-{4:4}, at: sock_shutdown+0x16f/0x280 drivers/block/nbd.c:410
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (&nsock->tx_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
sock_shutdown+0x16f/0x280 drivers/block/nbd.c:410
nbd_clear_sock drivers/block/nbd.c:1416 [inline]
nbd_config_put+0x1e6/0x750 drivers/block/nbd.c:1440
nbd_release+0xb7/0x190 drivers/block/nbd.c:1735
blkdev_put_whole+0xad/0xf0 block/bdev.c:683
bdev_release+0x47e/0x6d0 block/bdev.c:1106
blkdev_release+0x15/0x20 block/fops.c:660
__fput+0x3ff/0xb70 fs/file_table.c:465
task_work_run+0x14d/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
__do_fast_syscall_32+0x80/0x120 arch/x86/entry/syscall_32.c:309
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #5 (&nbd->config_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
refcount_dec_and_mutex_lock+0x51/0xc0 lib/refcount.c:118
nbd_config_put+0x31/0x750 drivers/block/nbd.c:1423
nbd_release+0xb7/0x190 drivers/block/nbd.c:1735
blkdev_put_whole+0xad/0xf0 block/bdev.c:683
bdev_release+0x47e/0x6d0 block/bdev.c:1106
blkdev_release+0x15/0x20 block/fops.c:660
__fput+0x3ff/0xb70 fs/file_table.c:465
fput_close_sync+0x15e/0x1e0 fs/file_table.c:570
__do_sys_close fs/open.c:1581 [inline]
__se_sys_close fs/open.c:1566 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1566
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
-> #4 (&disk->open_mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
bdev_open+0x41a/0xe40 block/bdev.c:907
bdev_file_open_by_dev block/bdev.c:1021 [inline]
bdev_file_open_by_dev+0x17d/0x210 block/bdev.c:996
disk_scan_partitions+0x1ed/0x320 block/genhd.c:374
add_disk_fwnode+0x1060/0x13a0 block/genhd.c:526
pmem_attach_disk+0x981/0x1350 drivers/nvdimm/pmem.c:574
nd_pmem_probe+0x1a9/0x1f0 drivers/nvdimm/pmem.c:647
nvdimm_bus_probe+0x169/0x5d0 drivers/nvdimm/bus.c:94
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__driver_attach+0x283/0x580 drivers/base/dd.c:1216
bus_for_each_dev+0x13b/0x1d0 drivers/base/bus.c:370
bus_add_driver+0x2e9/0x690 drivers/base/bus.c:678
driver_register+0x15c/0x4b0 drivers/base/driver.c:249
__nd_driver_register+0x103/0x1a0 drivers/nvdimm/bus.c:622
do_one_initcall+0x120/0x6e0 init/main.c:1257
do_initcall_level init/main.c:1319 [inline]
do_initcalls init/main.c:1335 [inline]
do_basic_setup init/main.c:1354 [inline]
kernel_init_freeable+0x5c2/0x900 init/main.c:1567
kernel_init+0x1c/0x2b0 init/main.c:1457
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #3 (&nvdimm_namespace_key){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
uevent_show+0x187/0x3b0 drivers/base/core.c:2730
dev_attr_show+0x53/0xe0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65
seq_read_iter+0x506/0x12c0 fs/seq_file.c:230
kernfs_fop_read_iter+0x40f/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x8c8/0xc70 fs/read_write.c:570
ksys_read+0x12a/0x240 fs/read_write.c:713
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
-> #2 (kn->active#5){++++}-{0:0}:
kernfs_drain+0x4af/0x570 fs/kernfs/dir.c:511
__kernfs_remove+0x271/0x890 fs/kernfs/dir.c:1506
kernfs_remove_by_name_ns+0x68/0x110 fs/kernfs/dir.c:1714
sysfs_remove_file include/linux/sysfs.h:794 [inline]
device_remove_file drivers/base/core.c:3048 [inline]
device_remove_file drivers/base/core.c:3044 [inline]
device_del+0x381/0x9f0 drivers/base/core.c:3853
unregister_netdevice_many_notify+0x17eb/0x25a0 net/core/dev.c:12007
unregister_netdevice_many net/core/dev.c:12035 [inline]
unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11887
unregister_netdevice include/linux/netdevice.h:3374 [inline]
ser_release+0x194/0x280 drivers/net/caif/caif_serial.c:296
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
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
-> #1 (rtnl_mutex){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
smc_vlan_by_tcpsk+0x251/0x620 net/smc/smc_core.c:1908
__smc_connect+0x44b/0x4880 net/smc/af_smc.c:1520
smc_connect+0x2fc/0x760 net/smc/af_smc.c:1696
__sys_connect_file+0x13e/0x1a0 net/socket.c:2038
__sys_connect+0x14d/0x170 net/socket.c:2057
__do_sys_connect net/socket.c:2063 [inline]
__se_sys_connect net/socket.c:2060 [inline]
__ia32_sys_connect+0x71/0xb0 net/socket.c:2060
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #0 (sk_lock-AF_SMC){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
lock_sock_nested+0x41/0xf0 net/core/sock.c:3702
lock_sock include/net/sock.h:1651 [inline]
smc_shutdown+0x65/0x7f0 net/smc/af_smc.c:2930
nbd_mark_nsock_dead+0xae/0x5d0 drivers/block/nbd.c:318
sock_shutdown+0x17c/0x280 drivers/block/nbd.c:411
nbd_clear_sock drivers/block/nbd.c:1416 [inline]
nbd_clear_sock_ioctl drivers/block/nbd.c:1554 [inline]
__nbd_ioctl drivers/block/nbd.c:1582 [inline]
nbd_ioctl+0x493/0xda0 drivers/block/nbd.c:1642
compat_blkdev_ioctl+0x2eb/0x7a0 block/ioctl.c:754
__do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
sk_lock-AF_SMC --> &nbd->config_lock --> &nsock->tx_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&nsock->tx_lock);
lock(&nbd->config_lock);
lock(&nsock->tx_lock);
lock(sk_lock-AF_SMC);
*** DEADLOCK ***
2 locks held by syz.1.7695/9020:
#0: ffff888055012198 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x150/0xda0 drivers/block/nbd.c:1635
#1: ffff88807491c870 (&nsock->tx_lock){+.+.}-{4:4}, at: sock_shutdown+0x16f/0x280 drivers/block/nbd.c:410
stack backtrace:
CPU: 1 UID: 0 PID: 9020 Comm: syz.1.7695 Not tainted 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079
check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2211
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
lock_sock_nested+0x41/0xf0 net/core/sock.c:3702
lock_sock include/net/sock.h:1651 [inline]
smc_shutdown+0x65/0x7f0 net/smc/af_smc.c:2930
nbd_mark_nsock_dead+0xae/0x5d0 drivers/block/nbd.c:318
sock_shutdown+0x17c/0x280 drivers/block/nbd.c:411
nbd_clear_sock drivers/block/nbd.c:1416 [inline]
nbd_clear_sock_ioctl drivers/block/nbd.c:1554 [inline]
__nbd_ioctl drivers/block/nbd.c:1582 [inline]
nbd_ioctl+0x493/0xda0 drivers/block/nbd.c:1642
compat_blkdev_ioctl+0x2eb/0x7a0 block/ioctl.c:754
__do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf73ce579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f503555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000ab04
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
block nbd1: shutting down sockets
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi