./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor369531151

<...>
Warning: Permanently added '10.128.1.13' (ED25519) to the list of known hosts.
execve("./syz-executor369531151", ["./syz-executor369531151"], 0x7fffc856fbd0 /* 10 vars */) = 0
brk(NULL)                               = 0x55555c863000
brk(0x55555c863d00)                     = 0x55555c863d00
arch_prctl(ARCH_SET_FS, 0x55555c863380) = 0
set_tid_address(0x55555c863650)         = 5834
set_robust_list(0x55555c863660, 24)     = 0
rseq(0x55555c863ca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor369531151", 4096) = 27
getrandom("\xb6\xcd\xea\xa1\x5d\xfc\x95\xfe", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55555c863d00
brk(0x55555c884d00)                     = 0x55555c884d00
brk(0x55555c885000)                     = 0x55555c885000
mprotect(0x7fe9cc20d000, 16384, PROT_READ) = 0
mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000
mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000
mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000
unshare(CLONE_NEWPID)                   = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5835 attached
 <unfinished ...>
[pid  5835] set_robust_list(0x55555c863660, 24 <unfinished ...>
[pid  5834] <... clone resumed>, child_tidptr=0x55555c863650) = 5835
[pid  5835] <... set_robust_list resumed>) = 0
[pid  5835] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5835] getppid()                   = 0
[pid  5835] openat(AT_FDCWD, "/proc/self/ns/net", O_RDONLY) = 3
[pid  5835] dup2(3, 201)                = 201
[pid  5835] close(3)                    = 0
[pid  5835] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0
[pid  5835] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0
[pid  5835] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0
[pid  5835] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0
[pid  5835] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0
[pid  5835] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0
[pid  5835] unshare(CLONE_NEWNS)        = 0
[pid  5835] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
[pid  5835] unshare(CLONE_NEWIPC)       = 0
[pid  5835] unshare(CLONE_NEWCGROUP)    = 0
[pid  5835] unshare(CLONE_NEWUTS)       = 0
[pid  5835] unshare(CLONE_SYSVSEM)      = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "16777216", 8)     = 8
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "536870912", 9)    = 9
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "1024", 4)         = 4
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "8192", 4)         = 4
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "1024", 4)         = 4
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "1024", 4)         = 4
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "1024 1048576 500 1024", 21) = 21
[pid  5835] close(3)                    = 0
[pid  5835] getpid()                    = 1
[pid  5835] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, inheritable=0}) = 0
[pid  5835] capset({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, inheritable=0}) = 0
[pid  5835] unshare(CLONE_NEWNET)       = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/net/ipv4/ping_group_range", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "0 65535", 7)      = 7
[pid  5835] close(3)                    = 0
[pid  5835] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3
[pid  5835] write(3, "100000", 6)       = 6
[pid  5835] close(3)                    = 0
[pid  5835] mkdir("./syz-tmp", 0777)    = 0
[pid  5835] mount("", "./syz-tmp", "tmpfs", 0, NULL) = 0
[pid  5835] mkdir("./syz-tmp/newroot", 0777) = 0
[pid  5835] mkdir("./syz-tmp/newroot/dev", 0700) = 0
[pid  5835] mount("/dev", "./syz-tmp/newroot/dev", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5835] mkdir("./syz-tmp/newroot/proc", 0700) = 0
[pid  5835] mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL) = 0
[pid  5835] mkdir("./syz-tmp/newroot/selinux", 0700) = 0
[pid  5835] mount("/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5835] mount("/sys/fs/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5835] mkdir("./syz-tmp/newroot/sys", 0700) = 0
[pid  5835] mount("/sys", "./syz-tmp/newroot/sys", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5835] mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5835] mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5835] mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5835] mkdir("./syz-tmp/newroot/syz-inputs", 0700) = 0
[pid  5835] mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL, MS_RDONLY|MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5835] mkdir("./syz-tmp/pivot", 0777) = 0
[pid  5835] pivot_root("./syz-tmp", "./syz-tmp/pivot") = 0
[pid  5835] chdir("/")                  = 0
[pid  5835] umount2("./pivot", MNT_DETACH) = 0
[pid  5835] chroot("./newroot")         = 0
[pid  5835] chdir("/")                  = 0
[pid  5835] mkdir("/dev/gadgetfs", 0777) = 0
[pid  5835] mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL) = 0
[pid  5835] mkdir("/dev/binderfs", 0777) = 0
[pid  5835] mount("binder", "/dev/binderfs", "binder", 0, NULL) = 0
[pid  5835] symlink("/dev/binderfs", "./binderfs") = 0
[pid  5835] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy)
executing program
[pid  5835] write(1, "executing program\n", 18) = 18
[pid  5835] openat(AT_FDCWD, "/proc/self/ns/net", O_RDONLY) = 3
[pid  5835] setns(201, 0)               = 0
[pid  5835] socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 4
[pid  5835] setns(3, 0)                 = 0
[pid  5835] close(3)                    = 0
[pid  5835] socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 3
[pid  5835] sendto(3, [{nlmsg_len=28, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x03\x00\x00\x00\x08\x00\x02\x00\x6e\x62\x64\x00"], 28, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 28
[pid  5835] recvfrom(3, [{nlmsg_len=180, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=1}, "\x01\x02\x00\x00\x08\x00\x02\x00\x6e\x62\x64\x00\x06\x00\x01\x00\x29\x00\x00\x00\x08\x00\x03\x00\x01\x00\x00\x00\x08\x00\x04\x00\x00\x00\x00\x00\x08\x00\x05\x00\x0a\x00\x00\x00\x54\x00\x06\x00\x14\x00\x01\x00\x08\x00\x01\x00\x01\x00\x00\x00\x08\x00\x02\x00\x0a\x00\x00\x00\x14\x00\x02\x00\x08\x00\x01\x00\x02\x00\x00\x00\x08\x00\x02\x00\x0a\x00\x00\x00\x14\x00\x03\x00\x08\x00\x01\x00\x03\x00\x00\x00"...], 4096, 0, NULL, NULL) = 180
[pid  5835] recvfrom(3, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=1}, {error=0, msg={nlmsg_len=28, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
[pid  5835] close(3)                    = 0
[pid  5835] socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 5]) = 0
[   88.089898][ T5835] netlink: 12 bytes leftover after parsing attributes in process `syz-executor369'.
[pid  5835] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x3c\x00\x00\x00\x29\x00\x01\x00\xff\xff\xff\xff\x00\x00\x00\x00\x01\x00\x00\x00\x0c\x00\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x10\x00\x07\x80\x0c\x00\x01\x80\x08\x00\x01\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", iov_len=60}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_FASTOPEN) = 60
[pid  5835] openat(AT_FDCWD, "/proc/self/ns/net", O_RDONLY) = 6
[pid  5835] setns(201, 0)               = 0
[pid  5835] socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 7
[pid  5835] setns(6, 0)                 = 0
[pid  5835] close(6)                    = 0
[pid  5835] socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 6
[pid  5835] sendto(6, [{nlmsg_len=28, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x03\x00\x00\x00\x08\x00\x02\x00\x6e\x62\x64\x00"], 28, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 28
[pid  5835] recvfrom(6, [{nlmsg_len=180, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=1}, "\x01\x02\x00\x00\x08\x00\x02\x00\x6e\x62\x64\x00\x06\x00\x01\x00\x29\x00\x00\x00\x08\x00\x03\x00\x01\x00\x00\x00\x08\x00\x04\x00\x00\x00\x00\x00\x08\x00\x05\x00\x0a\x00\x00\x00\x54\x00\x06\x00\x14\x00\x01\x00\x08\x00\x01\x00\x01\x00\x00\x00\x08\x00\x02\x00\x0a\x00\x00\x00\x14\x00\x02\x00\x08\x00\x01\x00\x02\x00\x00\x00\x08\x00\x02\x00\x0a\x00\x00\x00\x14\x00\x03\x00\x08\x00\x01\x00\x03\x00\x00\x00"...], 4096, 0, NULL, NULL) = 180
[pid  5835] recvfrom(6, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=1}, {error=0, msg={nlmsg_len=28, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
[pid  5835] close(6)                    = 0
[pid  5835] sendmsg(7, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x30\x00\x00\x00\x29\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x0c\x00\x06\x00\x01\x00\x01\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x07\x80", iov_len=48}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 48
[   88.294470][   T13] 
[   88.296846][   T13] ======================================================
[   88.303867][   T13] WARNING: possible circular locking dependency detected
[   88.310893][   T13] 6.16.0-rc2-syzkaller-00318-g739a6c93cc75 #0 Not tainted
[   88.318033][   T13] ------------------------------------------------------
[   88.325138][   T13] kworker/u8:1/13 is trying to acquire lock:
[   88.331206][   T13] ffff888025836358 (&disk->open_mutex){+.+.}-{4:4}, at: __del_gendisk+0x129/0x9e0
[   88.340468][   T13] 
[   88.340468][   T13] but task is already holding lock:
[   88.347858][   T13] ffff88802583c188 (&set->update_nr_hwq_lock){++++}-{4:4}, at: del_gendisk+0xe0/0x160
[   88.357691][   T13] 
[   88.357691][   T13] which lock already depends on the new lock.
[   88.357691][   T13] 
[   88.368193][   T13] 
[   88.368193][   T13] the existing dependency chain (in reverse order) is:
[   88.377300][   T13] 
[   88.377300][   T13] -> #2 (&set->update_nr_hwq_lock){++++}-{4:4}:
[   88.386174][   T13]        lock_acquire+0x120/0x360
[   88.391206][   T13]        down_write+0x96/0x1f0
[   88.395990][   T13]        blk_mq_update_nr_hw_queues+0x3b/0x14c0
[   88.402498][   T13]        nbd_start_device+0x16c/0xac0
[   88.407889][   T13]        nbd_genl_connect+0x1250/0x1930
[   88.413448][   T13]        genl_family_rcv_msg_doit+0x215/0x300
[   88.419525][   T13]        genl_rcv_msg+0x60e/0x790
[   88.424559][   T13]        netlink_rcv_skb+0x208/0x470
[   88.429855][   T13]        genl_rcv+0x28/0x40
[   88.434368][   T13]        netlink_unicast+0x75b/0x8d0
[   88.439661][   T13]        netlink_sendmsg+0x805/0xb30
[   88.445128][   T13]        __sock_sendmsg+0x21c/0x270
[   88.450432][   T13]        ____sys_sendmsg+0x505/0x830
[   88.455724][   T13]        ___sys_sendmsg+0x21f/0x2a0
[   88.460936][   T13]        __x64_sys_sendmsg+0x19b/0x260
[   88.466402][   T13]        do_syscall_64+0xfa/0x3b0
[   88.471520][   T13]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.477935][   T13] 
[   88.477935][   T13] -> #1 (&nbd->config_lock){+.+.}-{4:4}:
[   88.485777][   T13]        lock_acquire+0x120/0x360
[   88.490804][   T13]        __mutex_lock+0x182/0xe80
[   88.495843][   T13]        refcount_dec_and_mutex_lock+0x30/0xa0
[   88.502000][   T13]        nbd_config_put+0x2c/0x790
[   88.507119][   T13]        nbd_release+0xfe/0x140
[   88.511970][   T13]        bdev_release+0x536/0x650
[   88.517174][   T13]        blkdev_release+0x15/0x20
[   88.522211][   T13]        __fput+0x44c/0xa70
[   88.526892][   T13]        fput_close_sync+0x119/0x200
[   88.532181][   T13]        __x64_sys_close+0x7f/0x110
[   88.537430][   T13]        do_syscall_64+0xfa/0x3b0
[   88.542490][   T13]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.548934][   T13] 
[   88.548934][   T13] -> #0 (&disk->open_mutex){+.+.}-{4:4}:
[   88.556789][   T13]        validate_chain+0xb9b/0x2140
[   88.562207][   T13]        __lock_acquire+0xab9/0xd20
[   88.567420][   T13]        lock_acquire+0x120/0x360
[   88.572599][   T13]        __mutex_lock+0x182/0xe80
[   88.577890][   T13]        __del_gendisk+0x129/0x9e0
[   88.583022][   T13]        del_gendisk+0xe8/0x160
[   88.587881][   T13]        nbd_dev_remove_work+0x47/0xe0
[   88.593366][   T13]        process_scheduled_works+0xae1/0x17b0
[   88.599957][   T13]        worker_thread+0x8a0/0xda0
[   88.605089][   T13]        kthread+0x70e/0x8a0
[   88.609703][   T13]        ret_from_fork+0x3f9/0x770
[   88.614834][   T13]        ret_from_fork_asm+0x1a/0x30
[   88.620236][   T13] 
[   88.620236][   T13] other info that might help us debug this:
[   88.620236][   T13] 
[   88.630474][   T13] Chain exists of:
[   88.630474][   T13]   &disk->open_mutex --> &nbd->config_lock --> &set->update_nr_hwq_lock
[   88.630474][   T13] 
[   88.644743][   T13]  Possible unsafe locking scenario:
[   88.644743][   T13] 
[   88.652192][   T13]        CPU0                    CPU1
[   88.657555][   T13]        ----                    ----
[   88.662920][   T13]   rlock(&set->update_nr_hwq_lock);
[   88.668210][   T13]                                lock(&nbd->config_lock);
[   88.675335][   T13]                                lock(&set->update_nr_hwq_lock);
[   88.683231][   T13]   lock(&disk->open_mutex);
[   88.687843][   T13] 
[   88.687843][   T13]  *** DEADLOCK ***
[   88.687843][   T13] 
[   88.696338][   T13] 3 locks held by kworker/u8:1/13:
[   88.701458][   T13]  #0: ffff888025bf5148 ((wq_completion)nbd-del){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
[   88.712524][   T13]  #1: ffffc90000127bc0 ((work_completion)(&nbd->remove_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
[   88.724804][   T13]  #2: ffff88802583c188 (&set->update_nr_hwq_lock){++++}-{4:4}, at: del_gendisk+0xe0/0x160
[   88.734830][   T13] 
[   88.734830][   T13] stack backtrace:
[   88.740722][   T13] CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.16.0-rc2-syzkaller-00318-g739a6c93cc75 #0 PREEMPT(full) 
[   88.740741][   T13] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
[   88.740751][   T13] Workqueue: nbd-del nbd_dev_remove_work
[   88.740777][   T13] Call Trace:
[   88.740785][   T13]  <TASK>
[   88.740792][   T13]  dump_stack_lvl+0x189/0x250
[   88.740811][   T13]  ? __pfx_dump_stack_lvl+0x10/0x10
[   88.740828][   T13]  ? __pfx__printk+0x10/0x10
[   88.740844][   T13]  ? print_lock_name+0xde/0x100
[   88.740860][   T13]  print_circular_bug+0x2ee/0x310
[   88.740880][   T13]  check_noncircular+0x134/0x160
[   88.740900][   T13]  validate_chain+0xb9b/0x2140
[   88.740919][   T13]  ? __pfx_stack_trace_consume_entry+0x10/0x10
[   88.740940][   T13]  ? arch_stack_walk+0x11c/0x150
[   88.740961][   T13]  __lock_acquire+0xab9/0xd20
[   88.740977][   T13]  ? __del_gendisk+0x129/0x9e0
[   88.740993][   T13]  lock_acquire+0x120/0x360
[   88.741006][   T13]  ? __del_gendisk+0x129/0x9e0
[   88.741025][   T13]  ? check_path+0x21/0x40
[   88.741043][   T13]  __mutex_lock+0x182/0xe80
[   88.741058][   T13]  ? __del_gendisk+0x129/0x9e0
[   88.741078][   T13]  ? __del_gendisk+0x129/0x9e0
[   88.741095][   T13]  ? __pfx___mutex_lock+0x10/0x10
[   88.741109][   T13]  ? __pfx___might_resched+0x10/0x10
[   88.741127][   T13]  ? __lock_acquire+0xab9/0xd20
[   88.741141][   T13]  ? disk_del_events+0xb5/0x210
[   88.741160][   T13]  ? __del_gendisk+0xc1/0x9e0
[   88.741177][   T13]  __del_gendisk+0x129/0x9e0
[   88.741195][   T13]  ? del_gendisk+0xe0/0x160
[   88.741214][   T13]  ? __pfx___del_gendisk+0x10/0x10
[   88.741233][   T13]  ? down_read+0x1ad/0x2e0
[   88.741248][   T13]  del_gendisk+0xe8/0x160
[   88.741266][   T13]  nbd_dev_remove_work+0x47/0xe0
[   88.741287][   T13]  ? process_scheduled_works+0x9ef/0x17b0
[   88.741303][   T13]  process_scheduled_works+0xae1/0x17b0
[   88.741334][   T13]  ? __pfx_process_scheduled_works+0x10/0x10
[   88.741355][   T13]  worker_thread+0x8a0/0xda0
[   88.741379][   T13]  kthread+0x70e/0x8a0
[   88.741399][   T13]  ? __pfx_worker_thread+0x10/0x10
[   88.741416][   T13]  ? __pfx_kthread+0x10/0x10
[pid  5835] exit_group(1)               = ?
[pid  5835] +++ exited with 1 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5835, si_uid=0, si_status=1, si_utime=0, si_stime=55 /* 0.55 s */} ---
exit_group(0)                           = ?
[   88.741440][   T13]  ? _raw_spin_unlock_irq+0x23/0x50
[   88.741460][   T13]  ? lockdep_hardirqs_on+0x9c/0x150
[   88.741481][   T13]  ? __pfx_kthread+0x10/0x10
[   88.741500][   T13]  ret_from_fork+0x3f9/0x770
[   88.741515][   T13]  ? __pfx_ret_from_fork+0x10/0x10
[   88.741531][   T13]  ? __switch_to_asm+0x39/0x70
[   88.741549][   T13]  ? __switch_to_asm+0x33/0x70
[   88.741568][   T13]  ? __pfx_kthread+0x10/0x10
[   88.741586][   T13]  ret_from_fork_asm+0x1a/0x30
[   88.741609][   T13]  </TASK>
+++ exited with 0 +++
[   88.995295][ T5152] blo