======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G S           L     
------------------------------------------------------
syz.4.8680/27784 is trying to acquire lock:
ffffffff8ff4ff60 (nvmf_dev_mutex){+.+.}-{4:4}, at: nvmf_dev_show+0x26/0x210 drivers/nvme/host/fabrics.c:1446

but task is already holding lock:
ffff888079c5f098 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x1270 fs/seq_file.c:183

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&p->lock){+.+.}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5942 [inline]
       lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
       seq_read_iter+0xe1/0x1270 fs/seq_file.c:183
       kernfs_fop_read_iter+0x46c/0x610 fs/kernfs/file.c:290
       __kernel_read+0x397/0xad0 fs/read_write.c:532
       integrity_kernel_read+0x7e/0xb0 security/integrity/iint.c:28
       ima_calc_file_hash_tfm+0x25e/0x350 security/integrity/ima/ima_crypto.c:222
       ima_calc_file_hash+0x1e3/0x380 security/integrity/ima/ima_crypto.c:280
       ima_collect_measurement+0x94f/0xb30 security/integrity/ima/ima_api.c:300
       process_measurement+0xdfe/0x2350 security/integrity/ima/ima_main.c:425
       ima_file_check+0xc3/0x110 security/integrity/ima/ima_main.c:685
       security_file_post_open+0xc4/0x210 security/security.c:2755
       do_open fs/namei.c:4839 [inline]
       path_openat+0x5cd/0x2440 fs/namei.c:5000
       do_file_open+0x20e/0x430 fs/namei.c:5029
       do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
       do_sys_open fs/open.c:1423 [inline]
       __do_sys_openat fs/open.c:1439 [inline]
       __se_sys_openat fs/open.c:1434 [inline]
       __x64_sys_openat+0x12d/0x210 fs/open.c:1434
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5942 [inline]
       lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
       process_measurement+0x5ab/0x2350 security/integrity/ima/ima_main.c:319
       ima_file_check+0xc3/0x110 security/integrity/ima/ima_main.c:685
       security_file_post_open+0xc4/0x210 security/security.c:2755
       do_open fs/namei.c:4839 [inline]
       path_openat+0x5cd/0x2440 fs/namei.c:5000
       do_file_open+0x20e/0x430 fs/namei.c:5029
       file_open_name+0x1c3/0x3e0 fs/open.c:1375
       filp_open+0x2e/0x50 fs/open.c:1392
       kernel_read_file_from_path_initns+0xec/0x240 fs/kernel_read_file.c:159
       fw_get_filesystem_firmware drivers/base/firmware_loader/main.c:549 [inline]
       _request_firmware+0x733/0x13c0 drivers/base/firmware_loader/main.c:873
       request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:948
       reg_reload_regdb+0x85/0x460 net/wireless/reg.c:1067
       genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2575
       genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
       netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1364
       netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1919
       sock_sendmsg_nosec net/socket.c:800 [inline]
       __sock_sendmsg net/socket.c:815 [inline]
       ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2713
       ___sys_sendmsg+0x190/0x1e0 net/socket.c:2767
       __sys_sendmsg+0x160/0x210 net/socket.c:2799
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (cb_lock){++++}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5942 [inline]
       lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
       down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
       genl_release+0x7e/0x1d0 net/netlink/genetlink.c:697
       netlink_release+0x105e/0x2000 net/netlink/af_netlink.c:735
       __sock_release+0xb3/0x260 net/socket.c:735
       sock_close+0x1c/0x30 net/socket.c:1526
       __fput+0x3ff/0xb50 fs/file_table.c:512
       fput_close_sync+0x118/0x250 fs/file_table.c:617
       __do_sys_close fs/open.c:1560 [inline]
       __se_sys_close fs/open.c:1545 [inline]
       __x64_sys_close+0x8b/0x120 fs/open.c:1545
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5942 [inline]
       lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
       down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631
       inode_lock include/linux/fs.h:1024 [inline]
       __sock_release+0x86/0x260 net/socket.c:734
       sock_close+0x1c/0x30 net/socket.c:1526
       __fput+0x3ff/0xb50 fs/file_table.c:512
       __fput_sync+0xd7/0x100 fs/file_table.c:604
       nvme_tcp_alloc_queue.isra.0+0xd6d/0x1770 drivers/nvme/host/tcp.c:1985
       nvme_tcp_alloc_admin_queue drivers/nvme/host/tcp.c:2171 [inline]
       nvme_tcp_configure_admin_queue+0x26/0x530 drivers/nvme/host/tcp.c:2325
       nvme_tcp_setup_ctrl+0xa4/0xa20 drivers/nvme/host/tcp.c:2455
       nvme_tcp_create_ctrl+0x970/0xd90 drivers/nvme/host/tcp.c:3083
       nvmf_create_ctrl drivers/nvme/host/fabrics.c:1361 [inline]
       nvmf_dev_write+0x4ee/0xb60 drivers/nvme/host/fabrics.c:1408
       vfs_write+0x2aa/0x1050 fs/read_write.c:685
       ksys_write+0x12a/0x250 fs/read_write.c:739
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (nvmf_dev_mutex){+.+.}-{4:4}:
       check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209
       check_prevs_add kernel/locking/lockdep.c:3328 [inline]
       validate_chain kernel/locking/lockdep.c:3952 [inline]
       __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288
       lock_acquire kernel/locking/lockdep.c:5942 [inline]
       lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
       nvmf_dev_show+0x26/0x210 drivers/nvme/host/fabrics.c:1446
       traverse.part.0.constprop.0+0x107/0x650 fs/seq_file.c:112
       traverse fs/seq_file.c:99 [inline]
       seq_read_iter+0x93f/0x1270 fs/seq_file.c:196
       seq_read+0x344/0x4d0 fs/seq_file.c:163
       do_loop_readv_writev fs/read_write.c:848 [inline]
       do_loop_readv_writev fs/read_write.c:836 [inline]
       vfs_readv+0x5d8/0x8d0 fs/read_write.c:1021
       do_preadv+0x1ac/0x270 fs/read_write.c:1133
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  nvmf_dev_mutex --> &ima_iint_mutex_key[depth] --> &p->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&p->lock);
                               lock(&ima_iint_mutex_key[depth]);
                               lock(&p->lock);
  lock(nvmf_dev_mutex);

 *** DEADLOCK ***

locks held by syz.4.8680/27784: 1, last CPU#0:
 #0: ffff888079c5f098 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x1270 fs/seq_file.c:183

stack backtrace:
CPU: 0 UID: 0 PID: 27784 Comm: syz.4.8680 Tainted: G S           L      syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219
 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209
 check_prevs_add kernel/locking/lockdep.c:3328 [inline]
 validate_chain kernel/locking/lockdep.c:3952 [inline]
 __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
 nvmf_dev_show+0x26/0x210 drivers/nvme/host/fabrics.c:1446
 traverse.part.0.constprop.0+0x107/0x650 fs/seq_file.c:112
 traverse fs/seq_file.c:99 [inline]
 seq_read_iter+0x93f/0x1270 fs/seq_file.c:196
 seq_read+0x344/0x4d0 fs/seq_file.c:163
 do_loop_readv_writev fs/read_write.c:848 [inline]
 do_loop_readv_writev fs/read_write.c:836 [inline]
 vfs_readv+0x5d8/0x8d0 fs/read_write.c:1021
 do_preadv+0x1ac/0x270 fs/read_write.c:1133
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c1eb9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3c1fade028 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f3c1ee25fa0 RCX: 00007f3c1eb9e159
RDX: 0000000000000001 RSI: 00002000000004c0 RDI: 0000000000000003
RBP: 00007f3c1ec3506b R08: 0000000000000001 R09: 0000000000000000
R10: 00000000ffff0001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c1ee26038 R14: 00007f3c1ee25fa0 R15: 00007fff2bd2a528
 </TASK>