======================================================
WARNING: possible circular locking dependency detected
6.10.0-syzkaller-11926-g539fbb912321 #0 Not tainted
------------------------------------------------------
syz-executor/11385 is trying to acquire lock:
ffff88805a7dd3c8 (kn->active#5){++++}-{0:0}, at: __kernfs_remove+0x281/0x670 fs/kernfs/dir.c:1486
but task is already holding lock:
ffffffff8f75dfe8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x6f/0x6a0 drivers/net/netdevsim/netdev.c:773
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #7 (rtnl_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
start_sync_thread+0x12d/0x2740 net/netfilter/ipvs/ip_vs_sync.c:1761
do_ip_vs_set_ctl+0x41c/0x1070 net/netfilter/ipvs/ip_vs_ctl.c:2732
nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101
ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424
tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:3768
smc_setsockopt+0x1b4/0xc00 net/smc/af_smc.c:3072
do_sock_setsockopt+0x222/0x480 net/socket.c:2324
__sys_setsockopt+0x1a4/0x270 net/socket.c:2347
__do_sys_setsockopt net/socket.c:2356 [inline]
__se_sys_setsockopt net/socket.c:2353 [inline]
__ia32_sys_setsockopt+0xbc/0x160 net/socket.c:2353
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #6 (&smc->clcsock_release_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
smc_switch_to_fallback+0x2d/0xa00 net/smc/af_smc.c:902
smc_sendmsg+0x13d/0x520 net/smc/af_smc.c:2779
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x47f/0x4e0 net/socket.c:2204
__do_sys_sendto net/socket.c:2216 [inline]
__se_sys_sendto net/socket.c:2212 [inline]
__ia32_sys_sendto+0xdd/0x1b0 net/socket.c:2212
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #5 (sk_lock-AF_SMC){+.+.}-{0:0}:
lock_sock_nested+0x3a/0xf0 net/core/sock.c:3543
lock_sock include/net/sock.h:1607 [inline]
smc_shutdown+0x65/0x800 net/smc/af_smc.c:2921
nbd_mark_nsock_dead+0xae/0x5d0 drivers/block/nbd.c:303
sock_shutdown+0x17c/0x280 drivers/block/nbd.c:404
nbd_clear_sock drivers/block/nbd.c:1333 [inline]
nbd_clear_sock_ioctl drivers/block/nbd.c:1471 [inline]
__nbd_ioctl drivers/block/nbd.c:1499 [inline]
nbd_ioctl+0x49b/0xfd0 drivers/block/nbd.c:1559
compat_blkdev_ioctl+0x2fd/0x750 block/ioctl.c:732
__do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #4 (&nsock->tx_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
sock_shutdown+0x16f/0x280 drivers/block/nbd.c:403
nbd_clear_sock drivers/block/nbd.c:1333 [inline]
nbd_clear_sock_ioctl drivers/block/nbd.c:1471 [inline]
__nbd_ioctl drivers/block/nbd.c:1499 [inline]
nbd_ioctl+0x49b/0xfd0 drivers/block/nbd.c:1559
compat_blkdev_ioctl+0x2fd/0x750 block/ioctl.c:732
__do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #3 (&nbd->config_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
refcount_dec_and_mutex_lock+0x51/0xe0 lib/refcount.c:118
nbd_config_put+0x31/0x750 drivers/block/nbd.c:1340
nbd_release+0xb7/0x190 drivers/block/nbd.c:1652
blkdev_put_whole+0xad/0xf0 block/bdev.c:673
bdev_release+0x496/0x6f0 block/bdev.c:1096
blkdev_release+0x15/0x20 block/fops.c:638
__fput+0x408/0xbb0 fs/file_table.c:422
__fput_sync+0x47/0x50 fs/file_table.c:507
__do_sys_close fs/open.c:1566 [inline]
__se_sys_close fs/open.c:1551 [inline]
__x64_sys_close+0x86/0x100 fs/open.c:1551
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&disk->open_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
bdev_open+0x41a/0xe40 block/bdev.c:897
bdev_file_open_by_dev block/bdev.c:1011 [inline]
bdev_file_open_by_dev+0x17d/0x210 block/bdev.c:986
disk_scan_partitions+0x1ed/0x320 block/genhd.c:367
device_add_disk+0xfbb/0x12d0 block/genhd.c:510
pmem_attach_disk+0x9ab/0x13c0 drivers/nvdimm/pmem.c:576
nd_pmem_probe+0x1a9/0x1f0 drivers/nvdimm/pmem.c:649
nvdimm_bus_probe+0x169/0x5d0 drivers/nvdimm/bus.c:91
call_driver_probe drivers/base/dd.c:578 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:656
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:798
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:828
__driver_attach+0x283/0x580 drivers/base/dd.c:1214
bus_for_each_dev+0x13c/0x1d0 drivers/base/bus.c:368
bus_add_driver+0x2e9/0x690 drivers/base/bus.c:673
driver_register+0x15c/0x4b0 drivers/base/driver.c:246
__nd_driver_register+0x103/0x1a0 drivers/nvdimm/bus.c:619
do_one_initcall+0x128/0x630 init/main.c:1267
do_initcall_level init/main.c:1329 [inline]
do_initcalls init/main.c:1345 [inline]
do_basic_setup init/main.c:1364 [inline]
kernel_init_freeable+0x660/0xc50 init/main.c:1578
kernel_init+0x1c/0x2b0 init/main.c:1467
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #1 (&nvdimm_namespace_key){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
device_lock include/linux/device.h:1009 [inline]
uevent_show+0x188/0x3b0 drivers/base/core.c:2743
dev_attr_show+0x53/0xe0 drivers/base/core.c:2437
sysfs_kf_seq_show+0x223/0x3e0 fs/sysfs/file.c:59
seq_read_iter+0x4fa/0x12c0 fs/seq_file.c:230
kernfs_fop_read_iter+0x41a/0x590 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:395 [inline]
vfs_read+0x869/0xbd0 fs/read_write.c:476
ksys_read+0x12f/0x260 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (kn->active#5){++++}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
kernfs_drain+0x48f/0x590 fs/kernfs/dir.c:500
__kernfs_remove+0x281/0x670 fs/kernfs/dir.c:1486
kernfs_remove_by_name_ns+0xb2/0x130 fs/kernfs/dir.c:1694
sysfs_remove_file include/linux/sysfs.h:773 [inline]
device_remove_file drivers/base/core.c:3061 [inline]
device_remove_file drivers/base/core.c:3057 [inline]
device_del+0x381/0x9f0 drivers/base/core.c:3866
unregister_netdevice_many_notify+0x103b/0x1e40 net/core/dev.c:11377
unregister_netdevice_many net/core/dev.c:11405 [inline]
unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11280
unregister_netdevice include/linux/netdevice.h:3129 [inline]
nsim_destroy+0x107/0x6a0 drivers/net/netdevsim/netdev.c:778
__nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1425
nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline]
nsim_dev_reload_destroy+0x108/0x4d0 drivers/net/netdevsim/dev.c:1658
nsim_drv_remove+0x52/0x1d0 drivers/net/netdevsim/dev.c:1673
device_remove+0xc8/0x170 drivers/base/dd.c:566
__device_release_driver drivers/base/dd.c:1270 [inline]
device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1293
bus_remove_device+0x22f/0x420 drivers/base/bus.c:574
device_del+0x396/0x9f0 drivers/base/core.c:3868
device_unregister+0x1d/0xc0 drivers/base/core.c:3909
nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline]
del_device_store+0x346/0x4b0 drivers/net/netdevsim/bus.c:226
bus_attr_store+0x76/0xa0 drivers/base/bus.c:170
sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x343/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0x6b6/0x1140 fs/read_write.c:590
ksys_write+0x12f/0x260 fs/read_write.c:643
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
kn->active#5 --> &smc->clcsock_release_lock --> rtnl_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(rtnl_mutex);
lock(&smc->clcsock_release_lock);
lock(rtnl_mutex);
lock(kn->active#5);
*** DEADLOCK ***
7 locks held by syz-executor/11385:
#0: ffff888027a6a420 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643
#1: ffff888064dfa888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x281/0x500 fs/kernfs/file.c:325
#2: ffff88801bdb4b48 (kn->active#52){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a4/0x500 fs/kernfs/file.c:326
#3: ffffffff8ed93c28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd2/0x4b0 drivers/net/netdevsim/bus.c:216
#4: ffff88802abac0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
#4: ffff88802abac0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1093 [inline]
#4: ffff88802abac0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1290
#5: ffff8880118dd250 (&devlink->lock_key#36){+.+.}-{3:3}, at: nsim_drv_remove+0x4a/0x1d0 drivers/net/netdevsim/dev.c:1672
#6: ffffffff8f75dfe8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x6f/0x6a0 drivers/net/netdevsim/netdev.c:773
stack backtrace:
CPU: 3 UID: 0 PID: 11385 Comm: syz-executor Not tainted 6.10.0-syzkaller-11926-g539fbb912321 #0
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:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
kernfs_drain+0x48f/0x590 fs/kernfs/dir.c:500
__kernfs_remove+0x281/0x670 fs/kernfs/dir.c:1486
kernfs_remove_by_name_ns+0xb2/0x130 fs/kernfs/dir.c:1694
sysfs_remove_file include/linux/sysfs.h:773 [inline]
device_remove_file drivers/base/core.c:3061 [inline]
device_remove_file drivers/base/core.c:3057 [inline]
device_del+0x381/0x9f0 drivers/base/core.c:3866
unregister_netdevice_many_notify+0x103b/0x1e40 net/core/dev.c:11377
unregister_netdevice_many net/core/dev.c:11405 [inline]
unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11280
unregister_netdevice include/linux/netdevice.h:3129 [inline]
nsim_destroy+0x107/0x6a0 drivers/net/netdevsim/netdev.c:778
__nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1425
nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline]
nsim_dev_reload_destroy+0x108/0x4d0 drivers/net/netdevsim/dev.c:1658
nsim_drv_remove+0x52/0x1d0 drivers/net/netdevsim/dev.c:1673
device_remove+0xc8/0x170 drivers/base/dd.c:566
__device_release_driver drivers/base/dd.c:1270 [inline]
device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1293
bus_remove_device+0x22f/0x420 drivers/base/bus.c:574
device_del+0x396/0x9f0 drivers/base/core.c:3868
device_unregister+0x1d/0xc0 drivers/base/core.c:3909
nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline]
del_device_store+0x346/0x4b0 drivers/net/netdevsim/bus.c:226
bus_attr_store+0x76/0xa0 drivers/base/bus.c:170
sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x343/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0x6b6/0x1140 fs/read_write.c:590
ksys_write+0x12f/0x260 fs/read_write.c:643
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fbf579
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:00000000ff9b3220 EFLAGS: 00000293 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000ff9b3260
RDX: 0000000000000001 RSI: 00000000f7449ff4 RDI: 0000000000000000
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
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