./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1431779577 <...> Warning: Permanently added '10.128.0.110' (ED25519) to the list of known hosts. execve("./syz-executor1431779577", ["./syz-executor1431779577"], 0x7ffe13085f30 /* 10 vars */) = 0 brk(NULL) = 0x555571d2b000 brk(0x555571d2bd40) = 0x555571d2bd40 arch_prctl(ARCH_SET_FS, 0x555571d2b3c0) = 0 set_tid_address(0x555571d2b690) = 5092 set_robust_list(0x555571d2b6a0, 24) = 0 rseq(0x555571d2bce0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1431779577", 4096) = 28 getrandom("\xdf\x25\xe8\x4e\x2b\x94\xa3\x47", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555571d2bd40 brk(0x555571d4cd40) = 0x555571d4cd40 brk(0x555571d4d000) = 0x555571d4d000 mprotect(0x7f22b0889000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 getpid() = 5092 openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC) = 3 write(3, "10000000000", 11) = 11 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 write(3, "20", 2) = 2 close(3) = 0 openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 write(3, "100", 3) = 3 close(3) = 0 openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 write(3, "7 4 1 3", 7) = 7 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 write(3, "5092", 4) = 4 close(3) = 0 chmod("/dev/raw-gadget", 0666) = 0 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5093 attached , child_tidptr=0x555571d2b690) = 5093 [pid 5093] set_robust_list(0x555571d2b6a0, 24) = 0 [pid 5093] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy) [pid 5093] socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI) = 3 [pid 5093] openat(AT_FDCWD, "/dev/vhci", O_RDWR) = 4 [pid 5093] dup2(4, 202) = 202 [pid 5093] close(4) = 0 [pid 5093] write(202, "\xff\x00", 2) = 2 [pid 5093] read(202, "\xff\x00\x00\x00", 4) = 4 [pid 5093] rt_sigaction(SIGRT_1, {sa_handler=0x7f22b0832ed0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f22b0824ce0}, NULL, 8) = 0 [pid 5093] rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 [pid 5093] mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f22afe00000 [pid 5093] mprotect(0x7f22afe01000, 8388608, PROT_READ|PROT_WRITE) = 0 [pid 5093] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 [pid 5093] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7f22b0600990, parent_tid=0x7f22b0600990, exit_signal=0, stack=0x7f22afe00000, stack_size=0x800300, tls=0x7f22b06006c0}./strace-static-x86_64: Process 5096 attached => {parent_tid=[2]}, 88) = 2 [pid 5096] rseq(0x7f22b0600fe0, 0x20, 0, 0x53053053 [pid 5093] rt_sigprocmask(SIG_SETMASK, [], [pid 5096] <... rseq resumed>) = 0 [pid 5093] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 5096] set_robust_list(0x7f22b06009a0, 24 [pid 5093] ioctl(3, HCIDEVUP [pid 5096] <... set_robust_list resumed>) = 0 [pid 5096] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 5096] read(202, "\x01\x03\x0c\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x03\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x03\x10\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x03\x10", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x01\x10\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x01\x10", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x09\x10\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\x0a", iov_len=2}, {iov_base="\x01\x09\x10", iov_len=3}, {iov_base="\x00\xaa\xaa\xaa\xaa\xaa\xaa", iov_len=7}], 4) = 13 [pid 5096] read(202, "\x01\x05\x10\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\x0b", iov_len=2}, {iov_base="\x01\x05\x10", iov_len=3}, {iov_base="\x00\xfd\x03\x60\x04\x00\x06\x00", iov_len=8}], 4) = 14 [pid 5096] read(202, "\x01\x23\x0c\x00", 1024) = 4 [ 74.770116][ T5094] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 74.789681][ T5094] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 74.811321][ T5094] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x23\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x14\x0c\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x14\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x25\x0c\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x25\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x38\x0c\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x38\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x39\x0c\x00", 1024) = 4 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x39\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5096] read(202, "\x01\x16\x0c\x02\x00\x7d", 1024) = 6 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\xfc", iov_len=2}, {iov_base="\x01\x16\x0c", iov_len=3}, {iov_base="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., iov_len=249}], 4) = 255 [pid 5093] <... ioctl resumed>, 0) = -1 EALREADY (Operation already in progress) [pid 5096] read(202, [pid 5093] ioctl(3, HCISETSCAN [pid 5096] <... read resumed>"\x01\x1a\x0c\x01\x02", 1024) = 5 [ 74.836709][ T5094] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 74.856298][ T5094] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 74.874528][ T5094] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 [pid 5096] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x0e\x04", iov_len=2}, {iov_base="\x01\x1a\x0c", iov_len=3}, {iov_base="\x00", iov_len=1}], 4) = 7 [pid 5096] rt_sigprocmask(SIG_BLOCK, ~[RT_1], [pid 5093] <... ioctl resumed>, 0x7fff7aee20b8) = 0 [pid 5096] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 5093] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x04\x0a", iov_len=2}, {iov_base="\xaa\xaa\xaa\xaa\xaa\x10\x00\x00\x00\x01", iov_len=10}], 3 [pid 5096] madvise(0x7f22afe00000, 8372224, MADV_DONTNEED) = 0 [pid 5096] exit(0) = ? [pid 5096] +++ exited with 0 +++ [pid 5093] <... writev resumed>) = 13 [pid 5093] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x03\x0b", iov_len=2}, {iov_base="\x00\xc8\x00\xaa\xaa\xaa\xaa\xaa\x10\x01\x00", iov_len=11}], 3) = 14 [pid 5093] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\v\v", iov_len=2}, {iov_base="\x00\xc8\x00\x00\x00\x00\x00\x00\x00\x00\x00", iov_len=11}], 3) = 14 [pid 5093] writev(202, [{iov_base="\x04", iov_len=1}, {iov_base="\x3e\x13", iov_len=2}, {iov_base="\x01\x00\xc9\x00\x01\x00\xaa\xaa\xaa\xaa\xaa\x11\x00\x00\x00\x00\x00\x00\x00", iov_len=19}], 3) = 22 [pid 5093] close(3) = 0 [pid 5093] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5093] setsid() = 1 [pid 5093] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5093] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5093] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5093] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5093] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5093] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5093] unshare(CLONE_NEWNS) = 0 [pid 5093] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5093] unshare(CLONE_NEWIPC) = 0 [pid 5093] unshare(CLONE_NEWCGROUP) = 0 [pid 5093] unshare(CLONE_NEWUTS) = 0 [pid 5093] unshare(CLONE_SYSVSEM) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "16777216", 8) = 8 [pid 5093] close(3) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "536870912", 9) = 9 [pid 5093] close(3) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "1024", 4) = 4 [pid 5093] close(3) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "8192", 4) = 4 [pid 5093] close(3) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "1024", 4) = 4 [pid 5093] close(3) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "1024", 4) = 4 [pid 5093] close(3) = 0 [pid 5093] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5093] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5093] close(3) = 0 [pid 5093] getpid() = 1 [pid 5093] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<cmd_sync_work)){+.+.}-{0:0}, at: __flush_work+0xe6/0xd00 [ 85.890163][ T5093] [ 85.890163][ T5093] but task is already holding lock: [ 85.897528][ T5093] ffff88807643d060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x28/0x90 [ 85.906696][ T5093] [ 85.906696][ T5093] which lock already depends on the new lock. [ 85.906696][ T5093] [ 85.917116][ T5093] [ 85.917116][ T5093] the existing dependency chain (in reverse order) is: [ 85.926226][ T5093] [ 85.926226][ T5093] -> #1 (&hdev->req_lock){+.+.}-{3:3}: [ 85.933871][ T5093] lock_acquire+0x1ed/0x550 [ 85.938895][ T5093] __mutex_lock+0x136/0xd70 [ 85.943912][ T5093] hci_cmd_sync_work+0x1ec/0x400 [ 85.949369][ T5093] process_scheduled_works+0xa2c/0x1830 [ 85.955432][ T5093] worker_thread+0x86d/0xd70 [ 85.960537][ T5093] kthread+0x2f0/0x390 [ 85.965126][ T5093] ret_from_fork+0x4b/0x80 [ 85.970061][ T5093] ret_from_fork_asm+0x1a/0x30 [ 85.975344][ T5093] [ 85.975344][ T5093] -> #0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}: [ 85.985070][ T5093] validate_chain+0x18cb/0x58e0 [ 85.990440][ T5093] __lock_acquire+0x1346/0x1fd0 [ 85.995820][ T5093] lock_acquire+0x1ed/0x550 [ 86.000854][ T5093] __flush_work+0x73c/0xd00 [ 86.005877][ T5093] __cancel_work_sync+0xbc/0x110 [ 86.011331][ T5093] hci_cmd_sync_clear+0x30/0x220 [ 86.016788][ T5093] hci_dev_close_sync+0xbae/0x1060 [ 86.022420][ T5093] hci_dev_do_close+0x30/0x90 [ 86.027618][ T5093] hci_rfkill_set_block+0x232/0x300 [ 86.033337][ T5093] rfkill_set_block+0x1f1/0x440 [ 86.038730][ T5093] rfkill_fop_write+0x5bb/0x790 [ 86.044104][ T5093] vfs_writev+0x733/0xbe0 [ 86.048957][ T5093] do_writev+0x1b1/0x350 [ 86.053720][ T5093] do_syscall_64+0xf5/0x240 [ 86.058763][ T5093] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.065175][ T5093] [ 86.065175][ T5093] other info that might help us debug this: [ 86.065175][ T5093] [ 86.075396][ T5093] Possible unsafe locking scenario: [ 86.075396][ T5093] [ 86.082837][ T5093] CPU0 CPU1 [ 86.088193][ T5093] ---- ---- [ 86.093552][ T5093] lock(&hdev->req_lock); [ 86.097971][ T5093] lock((work_completion)(&hdev->cmd_sync_work)); [ 86.107005][ T5093] lock(&hdev->req_lock); [ 86.113955][ T5093] lock((work_completion)(&hdev->cmd_sync_work)); [ 86.120487][ T5093] [ 86.120487][ T5093] *** DEADLOCK *** [ 86.120487][ T5093] [ 86.128637][ T5093] 3 locks held by syz-executor143/5093: [ 86.134169][ T5093] #0: ffffffff8f8b13e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a9/0x790 [ 86.144272][ T5093] #1: ffff88807643d060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x28/0x90 [ 86.153854][ T5093] #2: ffffffff8e333ba0 (rcu_read_lock){....}-{1:2}, at: __flush_work+0xe6/0xd00 [ 86.163014][ T5093] [ 86.163014][ T5093] stack backtrace: [ 86.168906][ T5093] CPU: 0 PID: 5093 Comm: syz-executor143 Not tainted 6.9.0-rc5-next-20240426-syzkaller #0 [ 86.178784][ T5093] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 86.188841][ T5093] Call Trace: [ 86.192115][ T5093] [ 86.195037][ T5093] dump_stack_lvl+0x241/0x360 [ 86.199725][ T5093] ? __pfx_dump_stack_lvl+0x10/0x10 [ 86.204932][ T5093] ? print_circular_bug+0x130/0x1a0 [ 86.210133][ T5093] check_noncircular+0x36a/0x4a0 [ 86.215072][ T5093] ? __pfx_check_noncircular+0x10/0x10 [ 86.220528][ T5093] ? lockdep_lock+0x123/0x2b0 [ 86.225202][ T5093] ? _find_first_zero_bit+0xd4/0x100 [ 86.230519][ T5093] validate_chain+0x18cb/0x58e0 [ 86.235400][ T5093] ? mark_lock+0x9a/0x350 [ 86.239735][ T5093] ? __pfx_validate_chain+0x10/0x10 [ 86.244940][ T5093] ? look_up_lock_class+0x77/0x160 [ 86.250052][ T5093] ? register_lock_class+0x102/0x980 [ 86.255336][ T5093] ? __pfx_register_lock_class+0x10/0x10 [ 86.260961][ T5093] ? do_raw_spin_lock+0x14f/0x370 [ 86.265989][ T5093] ? __pfx_lock_release+0x10/0x10 [ 86.271008][ T5093] ? mark_lock+0x9a/0x350 [ 86.275334][ T5093] __lock_acquire+0x1346/0x1fd0 [ 86.280187][ T5093] lock_acquire+0x1ed/0x550 [ 86.284686][ T5093] ? __flush_work+0xe6/0xd00 [ 86.289277][ T5093] ? __pfx_lock_acquire+0x10/0x10 [ 86.294295][ T5093] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 86.300363][ T5093] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 86.306693][ T5093] ? _raw_spin_unlock_irq+0x23/0x50 [ 86.311889][ T5093] ? __flush_work+0xe6/0xd00 [ 86.316475][ T5093] __flush_work+0x73c/0xd00 [ 86.320974][ T5093] ? __flush_work+0xe6/0xd00 [ 86.325567][ T5093] ? __flush_work+0xe6/0xd00 [ 86.330155][ T5093] ? __pfx___flush_work+0x10/0x10 [ 86.335178][ T5093] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.340489][ T5093] ? __pfx___cancel_work+0x10/0x10 [ 86.345617][ T5093] __cancel_work_sync+0xbc/0x110 [ 86.350673][ T5093] hci_cmd_sync_clear+0x30/0x220 [ 86.355610][ T5093] ? hci_sock_dev_event+0x3fc/0x5f0 [ 86.360810][ T5093] hci_dev_close_sync+0xbae/0x1060 [ 86.365927][ T5093] hci_dev_do_close+0x30/0x90 [ 86.370633][ T5093] hci_rfkill_set_block+0x232/0x300 [ 86.375834][ T5093] ? __pfx_hci_rfkill_set_block+0x10/0x10 [ 86.381551][ T5093] rfkill_set_block+0x1f1/0x440 [ 86.386405][ T5093] rfkill_fop_write+0x5bb/0x790 [ 86.391265][ T5093] ? common_file_perm+0x1a6/0x210 [ 86.396312][ T5093] ? __pfx_rfkill_fop_write+0x10/0x10 [ 86.401689][ T5093] ? bpf_lsm_file_permission+0x9/0x10 [ 86.407061][ T5093] ? rw_verify_area+0x1d2/0x6b0 [ 86.411907][ T5093] vfs_writev+0x733/0xbe0 [ 86.416242][ T5093] ? __pfx_rfkill_fop_write+0x10/0x10 [ 86.421619][ T5093] ? __pfx_vfs_writev+0x10/0x10 [ 86.426493][ T5093] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 86.432817][ T5093] ? _raw_spin_unlock_irq+0x23/0x50 [ 86.438017][ T5093] ? lockdep_hardirqs_on+0x99/0x150 [ 86.443214][ T5093] ? __fdget_pos+0x1a2/0x320 [ 86.447803][ T5093] do_writev+0x1b1/0x350 [ 86.452049][ T5093] ? __pfx_do_writev+0x10/0x10 [ 86.456812][ T5093] ? do_syscall_64+0x102/0x240 [ 86.461584][ T5093] do_syscall_64+0xf5/0x240 [ 86.466085][ T5093] ? clear_bhb_loop+0x35/0x90 [ 86.470761][ T5093] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.476651][ T5093] RIP: 0033:0x7f22b080b5d9 [ 86.481076][ T5093] Code: 48 83 c4 28 c3 e8 47 1d 00 00 0f 1f 80 00 00 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 b0 ff ff ff f7 d8 64 89 01 48 [ 86.500764][ T5093] RSP: 002b:00007fff7aee1ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 86.509173][ T5093] RAX: ffffffffffffffda RBX: 00007f22b085b468 RCX: 00007f22b080b5d9 [ 86.517138][ T5093] RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 [ 86.525103][ T5093] RBP: 00007fff7aee20f0 R08: 00007f2200000001 R09: 00007f2200000001 [ 86.533067][ T5093] R10: 00007f2200000001 R11: 0000000000000246 R12: 0000000000000003 [ 86.541044][ T5093] R13: 00007fff7aee20c0 R14: 0000000000000001 R15: 00007fff7aee20f0 [ 86.549023][ T5093] [ 87.016881][ T25] cfg80211: failed to load regulatory.db